Mark Ketchum's

<-- Tour Mark's Home Tour -->

Thank you for visiting

This page previously was a place for you to leave messages for me and the rest of the world to read and, to read what others have said. Sometimes I'd comment here too - just to prove that I came and looked occasionally.

But more recently it has turned into one big SPAM magnet. A place where web site operators would drop links to their own web sites - very often with nude pictures - presumably so that they would get higher page rankings in Google or other search engines. Because of that, I have now (25 March 2003) SHUT DOWN the submit feature.

Please read what others have had to write, but you can no longer ADD your own message.

good website very formal it helped my class learn what shell structures are
Laura arrowsmith
cambridge, england - Monday, March 10, 2003 at 16:33:45 (GMT)
Perfect valuable structural information. Thanks a lot Mark.
Mesbah Javid <>
Edmonton, AB Canada - Tuesday, March 04, 2003 at 15:14:24 (GMT)
KEEEP OFFFFF0 GO000000000000000000000000000 0000000000000000000000000
USA - Saturday, February 15, 2003 at 12:32:09 (GMT)
Do you know Doug de Vore, by any chance? It seems like he may have mentioned your name before. He told me about a bridge collapsing due to vibrations, so I did a search on Google and saw your page. Check out my adorable frog Marvin on my web page!
Kerry <>
Menlo Park, CA USA - Thursday, January 30, 2003 at 22:26:21 (GMT)
NEW POLL Provided that you could supply full restraint, is an endless spanning bridge (ring girder around Earths' equator) possible? - without Walter Wrights Push Gravity concept. See: Yes/No/Not sure (please add with comments - No explanations necessary, but welcome) See comments nine down or go to for diagrams and full explanations With thanks, Dave.
David Ratcliff <>
West Wyalong, NSW Australia - Thursday, January 23, 2003 at 10:10:41 (GMT)
my gr. 12 math teacher was talking about the tacoma bridge disaster of 1940 so i decided to look it up and mark ketchums collapsed bridge page was better than everywhere else i looked. thanks.
trevor martin <>
canada - Thursday, January 23, 2003 at 03:32:42 (GMT)
As an architecture student i found your site extremely useful as an introduction to shell structures. Thanks!
Tom Grey
Nottingham, UK - Tuesday, January 21, 2003 at 12:15:29 (GMT)
SUBJECT: E.S.B. To: The Civil Engineer members (and visitors) and Mark Ketchum Visitors. Can you please help with this survey. I don’t feel that I am ever going to master the computer, but I do know a thing or two about spanning methods and how it should all go together! - I have been practicing it now for more than eight solid years! My closed web beam design would best be described as a cross between a standard steel purlin and a standard truss, where maximum vertical strength is obtained in the continuous vertical wall. The beams are made from a flat sheet of steel and roll-formed into a deep “C” section purlin. “Z” “C” or “A” section purlins are then placed upright every equal depth of the beam apart and spot welded at approx’ every 100 mm along their inside flanges as well as whereboth outer flanges abut. Excellent lateral twist properties are also gained using this method. For larger spans, two three or even four beams are simply stacked on top of one another. – These beams are the lightest/strongest and most economical possible using standard readily available materials. The most probable reason that this beam design has never been thought of before is because there are those that specialise in purlins, and there are those that specialise in trusses. – Nothing in between! It is very very simple and obvious when understood, as are my open web trusses! My open web truss design simply has two layers of open webbing instead of the normal one layer. The second layer though only needs to be a half or even a third or fourth of the (90 degree) strut components as compared to the first layer (depending on the strength required and distance covered). My best description would be that the first layer determines the overall strength required of the top chord, whilst the second layer acts as a lever and eliminates sag and vertical sway. – Vertical sway being the biggest problem when spanning any great distances. The most probable reason that a double layer truss was not thought of before is because of issues of time and labour costs normally associated with smaller scale structures. On a larger scale though the costs decrease dramatically the further you span (surprisingly from as little as 25 metres) By using a double layer of webbing, or even three layers, FULL vertical and horizontal control can be achieved. – Therefore, using this method, allows for a vertical steel column to be constructed to full height (less webbing of around 10% of total weight) before it crushes from self weight. (Around 3.5 km uniform section and 6 km tapered section) A tower at 3.5 km uniform, supported at one end only, then equates to a bridge of 7 km long (self weight only and having two ends instead of one to share the load). You could not go to say 20 km with the bridge as the weight has to go somewhere. So provided that full vertical and lateral restraint is supplied. What will happen when a ring girder (endless bridge) is placed around the entire planet? Would the ring crush within itself? The general assumption is that it would, but all do not agree (including myself of course). The best explanation that I can offer is this: Hold up a length of hollow tubing, e.g. a foot long by 2”.There is of course NO sideward pressure apart from wind - only gravity. The total weight of the length of tubing is all that will be pressing into itself when it joins as the two ends meet. The weight, which is surprisingly very little (I say little on a grand scale), would also be evenly distributed around the entire ring. To make my theory even more credible: (from the report) - At Calumet, Michigan in 1901, they took two piano wires 4,250 feet long, plumb bobs attached, and dropped them down two mine shafts 4,250 feet apart. They expected the pull of gravity, which is supposed to be in the centre of the earth, to pull these two plumb bobs closer together. Much to their surprise they found that the wires at the bottom WERE FURTHER APART than they were at the top. This led them to believe that: Maybe there is no such thing as MASS ATTRACTION. Go to: to see more, including full drawings and photos.- To access documents (full explanations and dimensions) you will have to temporarily become a member. (Out of my control sorry) With thanks, Dave. Agree? Or disagree? - No explanation necessary with reply. 1)- Lightest/Strongest Closed Web Beam....Yes or No 2)- Tower to 3.5 km uniform...............Yes or No 3)- Endless Spanning Bridge...............Yes or No 4)- ......................................Not sure
David Ratcliff <>
West Wyalong, NSW Australia - Wednesday, January 15, 2003 at 23:27:03 (GMT)
Subject: Computer analysis HELP WANTED Anyone wishing to help, with computer model analysis skills. Experimenting with multiple layer open and closed web beams and trusses. - From tents and domes to bridges and towers. (Disc shaped hover/aircraft too) All welcome. Dave. (thanks Mark)
David Ratcliff <>
West Wyalong, NSW Australia - Thursday, January 09, 2003 at 12:05:01 (GMT)
Whoops! Go to Dave (again)
Dave <>
West Wyalong, N.S.W. Australia - Wednesday, January 08, 2003 at 10:50:43 (GMT)
Hi Mark, Thought I'd let you know where you can get a better view of my drawings (and explanations), as you had some difficulty with the originals (I still haven't learnt how to email them yet!) Kind regards, Dave.
Dave <>
West Wyalong, N.S.W. Australia - Wednesday, January 08, 2003 at 10:47:35 (GMT)
Hi Mark, Hope you like my poem LOOK AT ME, I'M AN ENGINEER By David Ratcliff © December 2002 Look at me, I'm an engineer! Look at me, look at me. I'm the best there is, The best there can be. You can't tell me that! I already knew! Who is this person? You’re nothing but a flea! You waste my precious time, You unplease me. I know the best way, I've been trained you see! Here comes another engineer. He's just like me! We’ll form our own club. We’re the best there can be. Well here we all are. We're big and fat. WE did this , and WE did that! Who's this person that questions me? Not an engineer? Well please allow me! What did you say? You can build a bridge? Around the whole world? It just can’t be done! Well alright then, ENLIGHTEN me! And then we'll see! I'm telling you it's impossible, it just can't be done! We worked it out fifty years ago, and we're number one! It's impossible. It just can't be done! Who do you think you are? You can't tell me that! I've been in the game for SIXTY FIVE years! Hey, I'm erm...eighty three! Get out of my sight! And don't come back! You annoy me! But you don't understand. I've got it down pat! I’ve worked it all out! So how about that?? I’ve worked it all out. Why can't you see?? Now I know that you're good, They told me that! But I've worked it all out! I've got it down pat! I've done my job, I worked it out! Get out, get out, Get out, get out! Get fucked. Get fucked. Get fucked and get fucked. Stick it you know where….. And lots of luck!! NOW I’M an engineer. But I HATE the name. I’ve taken them on, and played their game. They turned me away. They thought I was dumb. NOW who’s number TWO. And WHO’S number ONE? I tried to tell them. I tried to be nice. Now they're all embarrassed. All sugar and spice. We want to help. We’re going to refrain. We admit we were wrong. Can we start again? You silly old fool. You were just so smart. You’ve tarnished the name. You silly old fart. Look at me, I’m an engineer. Was what you said. But look what you left us – You’ll SOON all be dead! We’ll change the name. That’s what we’ll do. Engineers are dead. Two thousand and two!
David Ratcliff <>
West Wyalong, N.S.W. Australia - Saturday, December 28, 2002 at 20:35:14 (GMT)

Well...What can I say. Mark has replied to my recent message, assuring me that he had in fact been in the middle of answering my original letter.

I have since replied and apologised to mark for my outburst.

All throughout the eight or so years that I have been working on this project, I have suspected from the beginning that I was on to something that had been overlooked for a long time. And there were obvious reasons WHY it had been overlooked. - I had earlier on came across a simple double layer of webbing whilst playing around with various models using pvc conduit and piano wire as the main construction materials, which give you a good 'feel' for it. - It was not until some time later, after exploring single layer warren type trusses, that I found that a double layer of webbing was the only way to get more strength, and to control sag.

I am not a certified engineer, but upon making this discovery, naturally assumed that an engineer would be the first to realise the simplicity of it all. - The further you go with single layer trusses the more SAG there is, until eventually, the structure cannot even support its own weight and will collapse. - Any bridge builder knows that. The addition of a second layer of webbing will not only get rid of the sag, but also tighten the top chord to the point where VERTICAL SWAY is also controlled.

I will not go into any more detail at this stage, as I would like to give Mark another go at it. - He states that there were also a few questions that he had for me, which is a rare event from past communications with engineers, here anyway, as they seem to think that it has all been fully explored before.

To explain my outburst a little more, I had on the same day prior to writing to Mark, undergone yet ANOTHER rejection from an engineer here that is supposebly top in the field, who also insists that double layer has been FULLY explored before. In fact, he assures me that he also did a full semester on it at a local university some years ago. - Biggest problem he says, is that steel will weaken in a fire???? He hasn't kept any work on the subject though, but will TRY to dig up something for me...yeah right!

I don't know how it is in America, but here in Australia, anyone you talk to about engineers will always tell you that they haven't got their feet on the ground, that they are all UP themselves. - I noted that in one of your guests comments, the person writing, who would soon qualify to be an engineer, would prefer to be called a 'bridge builder'

Here are some other replies from starting from 1994;

1) I'm sure it's been done before.

2) I understand it completely.

3) They did some work on this thing before....Interesting though.

4) There are places where it can be improved.

5) You would need extra cables to control uplift.

6) Your drawings need to be more presentable.

7) For larger structures (domes) the hoop numbers would have to be increased....Therefore becomes too dense at pivotal areas.

8) The depth of the truss would have to be a metre over 25.

9) The tubing would have to be a metre in diameter to span 50 metres in a full arch.

10) You look too young! (I'm 47)

11) Even if it were endless spanning....What could I use it for?

12) For bridgework, fatigue is the worst problem.

13) It won't be any stronger in an arch!

14) Take it to British Aeronautics....Put my name on your list too! (Colin Kay, University of Physics Newcastle)

15) Send more money.

16) Ingenious, extremely lightweight....Interesting.

17) We'll make it happen!

18) It'll fall over....I'm an engineer.

19) We already have our own system.

20) Vertical load was spectacular.

21) Outstanding engineering limits.

22) Very good simple design....but we don't do fabrication.

23) Wish I'd have known about it 10 years ago!

24) Erm....Interesting....I'll get back to you in the morning!

25) Stop it. Please stop it!.. Any engineer, which obviously you are not, will tell you that the material would have to be at least a thousand times stronger for an endless bridge!!

26) I think the closed web has some merit. Open web...heat is the biggest problem.

I'll leave you with those thoughts, but once again, Mark, I sincerely apologise for my harsh words to you, and you may edit this letter to any way you see fit.

Kind regards, David Ratcliff.

PS Tower to 3.5km high...Bridge 4km or endless. - If I am wrong, then so what? But if I'm right???

David Ratcliff <>
West Wyalong, NSW Australia - Sunday, December 01, 2002 at 04:30:06 (GMT)
Enjoyed your pictures
Will Cottle <>
Murphy, TX USA - Tuesday, November 26, 2002 at 16:11:48 (GMT)
Mark, I thought that it was only engineers here in Australia that don't have their feet on the ground!!! I've written to you several times, explaining how you would go about spanning bridges further. - You asked for links...I gave them to you. I sent you drawings.....NO REPLY!!!!!! Who do you engineers think you are??...Just because I'm not one.... So you think.... What would he know??? Well you idiots, who think they're so special, have overlooked one very simple detail. Or is it TOO simple for you?? On checking out your site I thought.. Here's someone who has their heart in bridges. BULLSHIT!! All you want to do is boast about how clever you are!! LOOK AT ME!! I'M AN ENGINEER ...KISS MY ARSE>> UP YOURS BUDDY YOU'RE A BLOODY DISGRACE - YOU ALL ARE. WANKERS.............................................................................................................If there are any engineers out there reading this that STILL have an open mind, before they mingle with the rest of the high society, and before this wanker wipes his arse with my letter...GIVE ME A CALL ..THIS IS THE REAL THING!! TOWER TO 3.5km HIGH ...BRIDGE 4km MAYBE EVEN ENDLESS!!!!! As soon as I have mentioned this to an ENGINEER before, they either clam up, or start telling me how impossible it is (NOT WHY) and how expert they are in the field. -The others must have done the analysis wrong ... I'M THE BEST THERE IS...LOOK AT ME ...I'M AN ENGINEER!!! Australia (02) 6972 4016 (I've tried being nice...did'nt work!!!)
david ratcliff <>
west wyalong, nsw Australia - Monday, November 25, 2002 at 05:12:40 (GMT)
Fuck you for not making it possible to get off your page!!! Absolute WANKER! Hope you get done up your ass by a shipload of sailors.
buggs bunny <>
bunnyville, tx USA - Sunday, November 17, 2002 at 03:47:34 (GMT)
Hi Mark Nice to see your picture after so many years since we worked together at T.Y. Lin's office in S.F. Hope you are well and continue to produce such useful homepages. Regards Peter Jaeger
Peter Jaeger <>
Basel, Switzerland - Monday, November 11, 2002 at 16:03:57 (GMT)
i'm very much thankful to you for gifting such a knowledgeable stuff online. Being an architecture student of final yr. i'm happy that i could gain good information and study this topic as well.
ambika bhargava <>
indore, m.p. india - Sunday, November 03, 2002 at 17:12:54 (GMT)
This is the worst possible website i have seen in my life...It dosen't even deserve a rating! Okay fine I'll give you a rating IIIIIIIIIIITTTTTTTTTTTT SSSSSSUUUUUCCCCCCKKKKKKKKSSSSSSSSSSSS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!. BIG TIME!
Vuk <>
Toronto, Canada - Tuesday, October 29, 2002 at 02:38:19 (GMT)
“You know EVERONE is ignorant, only on DIFFERENT SUBJECTS !!” Thanks for putting your guest book out so we can leave a message. Thanks again! [:-) Margo, Via Con Dios
M. Lou
LA, CA USA - Monday, October 28, 2002 at 20:57:31 (GMT)
Greetings from Germany. The home of BMW motocycles. Nice page.Good informations Hans R 1150 RT and Alps-Driver
Hans Schöfer <>
Ulm, Germany - Monday, October 28, 2002 at 20:40:48 (GMT)
Hello, I was looking for information about BMW's bike engines (I m riding BMW only since 18 years...) and I found your web site. I would make my best compliment for your time and your work Ciao - GIorgio
Giorgio <>
italy - Saturday, October 12, 2002 at 08:41:03 (GMT)
Just surfing. A wise man will always change his mind . . a fool never will
Ronny Steil from FCK, Fussball Verein
Germany - Friday, October 04, 2002 at 13:39:11 (GMT)
sup cool page
kance <bones152003>
halstad, mn USA - Wednesday, September 25, 2002 at 14:36:47 (GMT)
hi ya i would just like 2 say dat i fink it iz a gud website and i love dis boy called adam and i love him soooo much!!! love emma
emma <>
london, loondon england - Monday, September 23, 2002 at 18:23:12 (GMT)
Thank you for a great amount of visuals. Your family has made a healthy impact on the world of structures and the people who see and use them.
G. Malcolm Brown <>
Norwich, ct USA - Thursday, August 29, 2002 at 19:21:10 (GMT)
HI, I have been looking for this site for a long time and
Albert Tehan <>
Beardstown, IL. USA - Tuesday, July 16, 2002 at 01:10:28 (GMT)
Your site is very helpfull for civil Engineers.
Sachin Man Shrestha <>
Chitwan, Nepal - Monday, July 08, 2002 at 11:55:02 (GMT)
Dear sir, what avery nice explaination for shells
gihan hannalla <>
egypt, USA - Thursday, June 20, 2002 at 16:52:04 (GMT)
the tocoma bridge was funny
Deborahrah <>
USA - Monday, May 20, 2002 at 13:54:21 (GMT)
Mark: I got my Ph.D. through Jimmy Chinn at the University of Colorado at Boulder in the early sixties. I believe I was a contemporary of your father; I have visited your firm in 1960 or 1961. How is your father? I would like to pick up some common threads if he is still active -- and/or create some new ones with you. I happen to be still active, teaching temporary structures. Regards. Krishnamurthy
Dr. N. Krishnamurthy <>
USA - Monday, May 13, 2002 at 11:10:42 (GMT)
I must say your work is inspiring.i'm intending on using your Ruck-A-Chucky bridge as a construction studies modle.i wonder would it be possible to send on any information on the bridge. yours, David
David o'malley <>
USA - Friday, May 10, 2002 at 17:11:23 (GMT)
youve got a brilliant website, many thanks for the help its provided me with for my assignment. its being a pleasure using your iste, hope to use it again in th near future. from M Akeel Hussain.
akeel <>
USA - Wednesday, May 08, 2002 at 13:21:57 (GMT)
Your site gave a lot of info on the Tacoma Bridge.And it gave many ideas on different structures that may be useful.Your a gift from [some place]
Amanda <>
USA - Friday, May 03, 2002 at 02:38:19 (GMT)
Truly I am totally surprised by their great investigation on the structures of it cracked, it is of remarkable interest all that you mention and I take advantage to congratulate him. This information will be very useful for my thesis for I got the I title of Civil Engineer, and he/she would thank him if it offered me information it has more than enough structural analysis. THANK YOU
Oscar Hale Palacios <>
QUERETARO, MEXICO - Tuesday, April 30, 2002 at 05:12:52 (GMT)
mark ketchum... thanks for all the picture about folded plate...when i got a home work from my lecturer i found many good pic that i need.. thanks.. im willy from indonesia... im a college student at trisakti university majoring architecture... thanks mark
willy <>
jakarta, 62 indonesia - Wednesday, April 17, 2002 at 13:39:53 (GMT)
Mark, hey I think I remember you from the Berkeley Wall years ago (1989-1997) I owned 600FZR's and a CBR900RR. Moved to Seattle in '97. I'm still working as a graphic/industrial designer. Own an Aprilia RSV Mille now and am the Aprilia (Rotax) Owner's Seattle Chapter Chairperson. Just thought I'd drop you a note. Keep well- Jeff
Jeff Smith <>
Seattle, WA USA - Monday, April 08, 2002 at 19:32:55 (GMT)
With a name like that I KNEW it had to be a good site!
Bob Ketchum <>
Mountain Home, AR USA - Wednesday, April 03, 2002 at 18:40:07 (GMT)
Estoy impresionada, es de lo mejor que he encontrado en la red relacionado con puentes, pero... ¿dónde y cuándo habrá información de cómo calcularlos para los que somos novatos?. Felicidades!! Un abrazo.
Mª Luisa Mora <>
Barcelona, España - Tuesday, March 12, 2002 at 18:54:15 (GMT)
Hi Mark: Remember me ;-) I was just watching DISCOVERY's "Engineering the Impossible" with my son(Carlo age 7), and saw your bit on the proposed Gibraltar span..."Hey, I know that guy!". My mom's still living on Willowbrook Rd, and we still enjoy holiday meals at your brother's table. My wife Martha is an architect in Hartford(schools & laboratories, not spans), and I'm a Chemist at UConn. I also have another son Joey(age 3). Best Wishes to your entire family! AJKind
Al Kind <>
Storrs, CT USA - Sunday, March 03, 2002 at 03:25:19 (GMT)
Los felicíto por esta pagina, que esta genial, al menos yo que soy estudiante, entendí de una manera muy clara y completa el concepto de que es un shell y las diferentes combinaciones y características de sus usos para una exposición de este tema. Gracias!
Juan Pablo Quintana Rojas <>
Oaxaca, Oax México - Saturday, March 02, 2002 at 20:33:29 (GMT)
Dear Mark I just wanted to say hello because I am Albin Chronowicz's grand daughter and I,d like you to Know that he would have been very interested in your work and extremely proud of your achievments. Yours Amy Gerrtt.
Amy Gerrett <>
Ripon, England - Tuesday, February 19, 2002 at 20:57:08 (GMT)
Your site is very interesting, well put together and informative, with personality!
SurrenderDorothy! <>
Hungary - Friday, February 15, 2002 at 22:13:44 (GMT)
Good webpage you have here, and best greetings to you all And You Are --> WELCOME <-- To Visit My Webpage as well -->
27 IDX 106 - Odinn
Akranes, ICELAND - Friday, February 15, 2002 at 00:37:45 (GMT)
Great site!
UEbersetzer Russisch UEbersetzen Russisch Austria Architects UEbersetzer Russisch Russisch freelancer architekt architekten architektur austria immo freelancer translators translations Russisch Deutsch Dolmetschen Russisch Deutsch Übersetzen Russisch Deutsch Übersetzen Russisch Deutsch Übersetzen Übersetzungen Russisch Deutsch Dolmetsch Russisch Deutsch Dolmetschen Russisch Deutsch Dolmetscher Russisch Deutsch Dolmetschen Russisch Deutsch Dolmetscherin Russisch Deutsch Dolmetschen Russisch Deutsch Dolmetscher Russisch Deutsch Übersetzung Russisch Deutsch Übersetzen Russisch Deutsch Dolmetschen Formular Kontakt Referenzen Russisch Deutsch Übersetzen Übersetzungen Russisch Deutsch Dolmetschen Übersetzung Russisch Deutsch Russisch Übersetzen dolmetschen.htm Russisch Übersetzen Russisch Übersetzen Übersetzen Russisch Übersetzen Russisch Übersetzen Russisch Übersetzung Russisch Online - Übersetzen Russisch Übersetzen im Web

USA - Tuesday, February 12, 2002 at 11:00:39 (GMT)
Yesterday I had occasion to to copy excerpts from a Milo Ketchum paper on the proper method of doing calculations into our company newsletter. Certain things needed saying and I have neither the eloquence nor the moral authority of Milo, so I borrowed both from him.
I really like the site. It's hard to leave the gems of widom.

Greg Luth <>
Santa Clara, CA USA - Friday, February 01, 2002 at 03:17:29 (GMT)
site is nice, but need work. visit my site for skill of true master of art of web design.
george <>
athens, greece - Monday, January 21, 2002 at 02:55:46 (GMT)
Awesome site!

Robosubmit BannerExchange

Sally <>
cambridge, MA USAUsa - Friday, January 11, 2002 at 07:26:27 (GMT)
Love the section on motorcycle center-of-gravity. I've reed Code's book's and just knew there was something wrong. The section from the discusion cleared it all up. "You can't change the static CoG, but you can change the dynamic one" Thanks a lot John
John Rohde Jensen <>
Aalborg, Denmark - Friday, December 28, 2001 at 13:42:33 (GMT)
How's it going. We finally upgraded our home computer to the point that we can visit your web-site without waiting 5 minutes for it to come up. So now our children can see all the wonders of the Ketchum mind. All the bridges and everything, how exciting.
Hope you are all doing well
Merry Christmas

Dickie <>
USA - Friday, December 28, 2001 at 01:24:24 (GMT)
hi i am an architect struggling with the building department. i am building monolithic barrel vaults and am having problems with conventual engineering can anyone help with calculations that inspectors can understand we have passed several rigorous test and are putting only 10pis to the ground with 1000psi material. we are building houses spanning 14 feet with 20 foot lengths what I am hopping for is a section in the code that I can use in place of chapter 16 of the UBC tall order I know but we are tenacious jim
Jim Bledsoe <>
Hesperia, ca USA - Saturday, November 17, 2001 at 02:40:21 (GMT)
I kinda like it. Thanks!
Cherrie Nelson <>
Tacoma, WA USA - Friday, November 16, 2001 at 00:46:19 (GMT)
Some nice work.
Andy Eldridge <>
Lockport, TN USA - Tuesday, November 06, 2001 at 23:04:25 (GMT)
I like this site. Keep it up!
Leanne Collins <>
Oakville, ON Canada - Tuesday, November 06, 2001 at 00:28:28 (GMT)
I am a practicing Architect and teacher. Very impressed with your work. Currently working on a project which is a complicated shell. If you are interested I can send you some renderings for your comments. Thanks again. Really great job, and hope you keep it going. Archt. Inan Dhaka
BKS Inan <>
Dhaka, Bangladesh - Monday, October 29, 2001 at 13:02:55 (GMT)
Hi there! I just bumped into your site, and I kind of enjoyed it. Keep it up! :-) Au revoir! Take care!
Jean Duvalle <>
New Orleans, LA United States - Sunday, October 21, 2001 at 14:33:14 (MDT)
Came to see the bridges.....GREAT!
Steph <>
Phoenix, AZ USA - Sunday, September 02, 2001 at 21:24:26 (PDT)
(Response from Mark: Steph's link takes you to a "Bridges of the World on Postage Stamps" site. [mk])
it was great learning.
virassamy gopinath <>
chennai, india - Thursday, August 30, 2001 at 20:01:26 (PDT)
Cool site. Thanks
Belton Mo
Shirley L. Lane, - Sunday, August 26, 2001 at 22:00:08 (PDT)
Hi Mark, I was interested to read your article about lane splitting, it's known as "filtering" in the U.K. I found it particularly relevant as I've just ridden from London to Liverpool and because of holiday congestion on the M6 motorway I've just completed my longest continual session of filtering - some 56 miles!
Terry English <>
Liverpool, U.K. - Sunday, August 26, 2001 at 14:34:02 (PDT)
I love buggs bunny he is the man. he make me happy when ever I see him I just want to say I love you.
tierra m.strickland <diamond_69>
chicago, ill USA - Thursday, August 23, 2001 at 14:22:47 (PDT)
I enjoyed your site! Thank You! Some of my other favorite sites are:
DragonBallZ Pictures
      Bikini Pictures

Art Bell
USA - Wednesday, August 22, 2001 at 17:53:53 (PDT)
After practicing as a independant structural consultant for 20 years I became totally demotivated in practicing structural design - after working with rescuers on a morbid disaster site. Your display is a welcomne sight ( forgive the pun) for sore eyes, embodying the ideals that I once held for creative design and construction. Nice work and good role modeling for those of less experience.
bob sirasch <>
lake mcquarie, nsw australia - Tuesday, August 07, 2001 at 04:02:32 (PDT)
Great webpage! Keep up the good work!
Arturo Martinez <>
Piura, Peru - Saturday, August 04, 2001 at 08:38:34 (PDT)
Interesting Carquinez Bridge site. Other than having crossed that span thousands of times, my personal attachment is that upon its dedication in 1927, my great-grandfather was mayor of Richmond and spoke at the ceremony.
Don Teeter <>
Orangevale, CA USA - Thursday, July 19, 2001 at 18:12:15 (PDT)
jeezuz... the technical motorcycle content is overwhelming... i think i have a headache now, but keep up the great work! much enjoyed! tjs
USA - Thursday, July 19, 2001 at 16:53:19 (PDT)
Nice site to visit, I get more information from this site. Thanx...
Azizah Baharom <>
Shah Alam, Selangor MALAYSIA - Wednesday, July 18, 2001 at 02:45:08 (PDT)
halifax graffiti, all the murals and bombs in halifax! also sketches from locals. tags and bombs found around the city. BMX and skateboarding pictures and local's info also.
halifax, nv USA - Saturday, July 07, 2001 at 19:34:38 (PDT)
Great site Mark, a Ketchum from Wisconsin checking in.
Milt Ketchum Jr <>
WI USA - Monday, June 25, 2001 at 09:51:51 (PDT)
Dear Mark, May i check with you this technical matter, and I realy appreciate if you are able to reply promptly, In designing the structural elements of cable stay bridges at the uls state , do you consider the same factors for the permanent dead loads and the cable forces or different factors between cales and permenant dead loads. I appreciate if you can advise on this matter. Regards
M.N.Yamout <>
Kuala lumpur, Malaysia - Tuesday, May 22, 2001 at 09:05:58 (PDT)
This is a very interesting site. I find myself helping some prople in Bangladesh. The project is to manufacture houses of ferrocement. I've done some preliminary design economics and come up with $1.50±/sq ft. I have built quite a bit but never so thin or with so many in mind. Perhaps you will be interested in this area of effort. Besides providing durable and long lived housing, saving their forests and profit are goals. Money is always a concern, especially in a country pulling itself up from a way behind place. Garrett
Garrett Connelly <>
USA - Friday, May 18, 2001 at 15:28:01 (PDT)
it is a nice place to visit, especially for those who has interest on civil engineering!
ZHU Jingxiang <>
Nanjing, p.r.china - Wednesday, May 16, 2001 at 08:08:15 (PDT)
This NEW state of the art Roof Coating Perticts agents RUST, REPELS WATER, DEADENS SOUND & INSULATES! *It's 100% Maintenance FREE! *With a 10 YEAR GUARANTE! Call Today for your FREE ESTIMATE! 1-800-860-9651 # 0728
Z-Best Metal Roof Repair Co. <>
Chouteau, ok USA - Saturday, April 28, 2001 at 10:16:26 (PDT)
USA - Wednesday, April 25, 2001 at 17:16:59 (PDT)
i am an aspiring engineer, although i prefer to call myself a bridge builder. i am only a few (105) units into becoming an engineer, but i still hope that my being pleased with your site is worth saying it. it is a nice glance at what will be my competition. thanks for the insight.
dray <>
palm desert, ca USA - Tuesday, April 24, 2001 at 20:26:29 (PDT)
Hi Mark. Great site! I found it through the website of the UK's Daily Telegraph, which is today (20 April, 2001) carrying a story on the proposed bridge from mainland Italy to Sicily. For your records, a similar project is currently afoot in Greece that will finally join Rion in the NW Peloponnese with Antirion in Western Greece. It's a huge project. You can find its very informative official website at BTW, "gefyra" (pron. YE-fee-ra) means "bridge" in Greek. :-) See you!
George Kontaris
Athens, Greece - Thursday, April 19, 2001 at 22:32:38 (PDT)
Bravo. I'm looking at shells tonight, and will definitely explore your site further later and recommend it to my students. This is great teaching material. Pat
Patricia Tutt <>
Peel, Isle of Man - Monday, April 02, 2001 at 17:02:20 (PDT)
Your homepage is perfect!!! I thank you very much for the beautifull pictures and the interesting and informing texts on these sides. They help me a lot to prepare a referate at school.
Jana Richter <>
Hohenstein-Ernstthal, Germany - Friday, March 30, 2001 at 13:31:14 (PST)
Hi my name is Cherish Belt. I am doing a project on bridges for my geometry class and I was wonderin if you could answer some questions for me. Have you ever built a bridge and if so can you tell me about it? What type of buildings have you constructed, planned, or worked on and which one is your favorite? your respond would be grately appreciated. Thank you.
cherish belt <>
Hagestown , IN USA - Monday, March 19, 2001 at 11:53:37 (PST)
Hello? Do you remember me? I added your Homepage to my Favorites. 8-) I appreciate for your advice about the analysis of the San Francisco-Oakland Bay Bridge. I'm so happy to know your Homepage. I really enjoyed useful information!!! Have a good day!
Koosun Kim <>
Stanford, CA USA - Tuesday, February 27, 2001 at 21:53:40 (PST)
Hi, Greetings from Finland.
Jari Peltonen <>
Tampere, FINLAND - Monday, February 26, 2001 at 13:08:19 (PST)
Hello Mark - The force will be with you :-)
Wojtek <>
Warsaw, Poland - Thursday, February 15, 2001 at 00:04:42 (PST)
Mark! Where are you? Are you lost in Bangkok with your BUNNY'S? I hear Warner Bros. is looking for you . . . beware of the Bunny Trap!
Carl & Jacques <>
San Francisco, CA USA - Saturday, February 10, 2001 at 21:58:14 (PST)
These were cool BMW illistrations, I have never owned a BMW but I know they are a cool ride. Back in the 1970 s I built several Harleys from the ground up,,,,,, choppers. I now am the proud owner of a 2000 Vulcan Classic, 1500 cc. This bike is better than any Harley I have ever rode. It is a true cruzer. Oh and for your question, Ill bet those illistrations are from BMW,,,,,,,, !!!!!!! Hell I don't know.
Dan Woodward <>
Fort Bragg, CA USA - Saturday, January 27, 2001 at 19:42:18 (PST)
Dear Mark, Great website. I really enjoyed the stuff on galloping gertie. I am an engineering major currently attending community college in Florida, and I'm giving a speech on my major for my public speaking class. The info on Gertie will make a great opening to catch my audience's attention. Thanks a lot. Keep up the spectacular work.
Maria <>
Palm Coast, FL USA - Tuesday, January 23, 2001 at 12:41:47 (PST)
Regarding Jacques Overhoff. I am a Dutch web designer living in Ithaca, NY, and a longtime friend of Jacques. I am presently putting a web page together about his work. If you have any material and would like to contribute something please contact me. Thanks!
Marc Susan <>
Ithaca, NY USA - Thursday, December 28, 2000 at 17:06:47 (PST)
'93 Kawasaki ZR 1100 restoration project
Kyle Calrk <>
Cambridge, MA USA - Wednesday, December 06, 2000 at 18:26:00 (PST)
Mark Hi I enjoyed your site. BTW I have an old Surveying Manual/Text Book written by Milo S. Ketchum in 1915. Was he your grandfather?
Steve Fiorelli <>
New York, NY USA - Wednesday, November 22, 2000 at 13:28:45 (PST)
I have found over 8000 names on the Ketchum's. Please let me know if you are related. This is an update on email address.
janet krussick <>
show low, az USA - Monday, November 06, 2000 at 07:53:54 (PST) This is where you go your images (I think)
Anonymous BMW owner
USA - Saturday, October 21, 2000 at 16:55:46 (PDT)
Hi i have an bmw r20 i want to restore and ineed some technical diagram of electric diagram of engine etr can you help me thanks giorgos
argirakis giorgos <>
greece - Friday, October 06, 2000 at 13:53:40 (PDT)
Great site Mark. Thanks for posting the R1100 Maintenance Guide in .PDF format. Glad to see that their are other Ketchum's that like to ride BMW's. Sincerely yours, Philip M. Ketchum '96 R1100RT Cobalt Blue Kansas City, MO
Philip M. Ketchum <>
Kansas City, MO USA - Saturday, September 30, 2000 at 16:50:51 (PDT)
Amazing can only begin to describe this site and its message to the public...keep up the good work!
Antonio Cofini <>
mississauga, canada - Monday, September 11, 2000 at 17:19:52 (PDT)
You are WELCOME to visit my webpage
Odinn Thor <>
Reykjavik, ICELAND - Sunday, September 10, 2000 at 15:33:16 (PDT)
I fell asleep on one of your bridges and didn't wake up until it went into harmonic distortion and found an icicle in my lap and a siren that had just gone off....
Dopey the 7th Dwarf
USA - Friday, September 08, 2000 at 13:28:47 (PDT)
Great site, love the bike stuff - some damn good articles here!! Mark.
Mark C <>
London, UK - Wednesday, September 06, 2000 at 08:08:03 (PDT)
I'm in 5 th grade and im doing a bridge project,one of the extra credit problems was to find what the nams of a bride was and wher it was located. Your site helped me find it. Thankyou!
Sara larland <Taraandtoby>
Atlanta, GA USA - Wednesday, August 30, 2000 at 16:48:44 (PDT)
I've seen a lot of Ketchum's around the web,
but not another Mark Ketchum

Mark Ketchum <>
Tacoma, WA USA - Monday, August 14, 2000 at 09:54:38 (PDT)
I'm not constructing an airport but the information is most informative and well put across, mant thanks !
John Tehan <>
Cheshire, England - Sunday, June 11, 2000 at 05:31:14 (PDT)
This site help me to resolve the roof of my airport project. Thanks, and continue this great job
Jorge Chong <>
panama, pma panama - Monday, June 05, 2000 at 07:25:49 (PDT)
Very important this work, for the analyses structural system.Thank you!
José Wagner Ambrosio <>
Juiz de Fora, MG Brasil - Sunday, May 28, 2000 at 05:29:42 (PDT)
Just Like I always said, "I'd walk a milo for good web site". See You next week, Dickie
Ozzie <>
somers, ct USA - Friday, May 26, 2000 at 04:50:17 (PDT)
Congrats on a Great site! You are a great asset to the country.
William Jefferson Clinton
- Friday, April 28, 2000 at 14:29:39 (PDT)
Mark, It is a great colllection of thin shell must have taken me years of searching to randomly find the bits and pieces that you have assemmbled as a group... I do love shells and I have built a few on my own, one in which I live, and they all have problems with leaks finding their way into the hairline cracks that develop with any complex compound curvature....thermal loads on the building from the sun cause it to expand and contract. I have visited all of Candela,s stuff and most have a rubberised silicone sprayed over the roof, just as I do. His church in Mexico City seems to be OK. The concrete also acts like a heat sink and they all overheat during the day...but they are beautiful, and with a silicone membrane sprayed on the top surface and urethane foam sprayed on the interior, they would behave the way a building should. Still, I would never live in anything that has straight lines and right angles again, and ferrocement is the best material I know of to build such versatile shapes, unless you are Antonio Gaudi...Thanks for a great site!!!
David Jagaciewski <>
West Park, NY USA - Friday, March 31, 2000 at 16:13:52 (PST)
Hi-de-ho neighbor! Just checking in on the western branch.... my what a busy engineering site this is!!! Soooo many students, so little time, eh? I'm helping my son put together a science project. Would you mind if we copied your bridge pics for the engineering portion? Let us know... take care (stay out of trouble or don't get caught!) Bob
Robert Ketchum <>
USA - Friday, March 31, 2000 at 12:08:56 (PST)
Thanks for the shell info. I'm interested in ferrocement construction for low-cost housing construction in Central America. I hope to be an engineering missionary after my retirement trying to alleviate the crushing needs there. Any suggestions for other sites along this line? Thank you!
Wayne Loftin <>
Florence, Ms USA - Thursday, March 30, 2000 at 11:08:31 (PST)
(Response from Mark: Try [mk])
God, Mark! What can't you do? I'm not worthy! I knew you were special but, my God, the bridges, the bikes, the life you lead!!!! I am nothing. Good thing I can live vicariously through this cool site. (SMILE) Your Pal, Al.
alice brown <>
USA - Wednesday, March 29, 2000 at 16:38:19 (PST)
dear sir, I am an architecture student in Middle East Technical University in Turkey.My new design project is shell structures.I was having difficuty to find any references.Thank you a lot(especially for the sketches) for preaparing such a great&detailed site about about shell structures.
ankara, TURKEY - Saturday, March 25, 2000 at 14:21:31 (PST)
Yep!. great site. I'm a student (suposed to be!) of civil ingeneering in Mexico City, but know i'm in Sweden trying to study also. I´m doing a research about the Öresund and found this one..... great one!! pretty interesting all your work in the bridge building industry.
Adrian Betanzos Díaz <>
Växjö, SE Sweden - Sunday, March 12, 2000 at 07:42:25 (PST)
Just another Ketchum checking in... or was it out? Hmmm... I never can tell! Oh,wait, there's the light switch.
Bob <>
USA - Sunday, March 05, 2000 at 17:02:49 (PST)
Dear Sir, Your site is very interesting to see. I also find that very helpful for me to understand "shell". I was wondering if you could provide more details on how, when, why, shell is better than others rather than What shell is. I love it anyway
Hadi <>
Jakarta, Indonesia - Sunday, March 05, 2000 at 00:54:04 (PST)
(Response from Mark: Thanks! There is some "how, when, why" in here, I'll try for more. [mk])
Kudos, cuz!
pete allenbach <>
Mansfield, Oh USA - Tuesday, February 29, 2000 at 01:17:46 (PST)
Brother, I am going to have to buy a new monitor after that experience. You come up with some of the greatest stuff. Next ought to be sound, but wait until I get my sound card working.
David "Windblown" Ketchum <>
Cheyenne, WY USA - Saturday, February 26, 2000 at 16:12:01 (PST)
Neat website. Love, Eric
Eric D. Ketchum <>
Gering, NE USA - Friday, February 25, 2000 at 13:43:36 (PST)
Oh, my GOD, a real earthquake right in our computer! Love, M, S, S & T
Marcia, Susan, Sam & Tim <>
USA - Friday, February 25, 2000 at 13:06:34 (PST)
Yes! It works. I just tried your "experience an earthquake" now and even on my five year old Macintosh it came accross just fine. Only one problem . . . how do you make it stop?!! It reminded me of that fateful day, October 17, 1989, when you were standing in my office practicing the Hawaiian "Hula"! Great addition.
Carl Maletic <>
San Francisco, CA USA - Friday, February 25, 2000 at 10:59:35 (PST)
Very cool site! We happened to meet online since I had used the wrong e-mail address and thought I'd visit the site. Nice job! I like the directional arrows -- neat effect. Cheers, -A
Andy <>
USA - Thursday, February 24, 2000 at 10:52:42 (PST)
(Response from Mark: Andy had confused (Ketchum Advertising) with (this place) in addressing some e-mail. Thanks for fixing it so quickly, A. [mk])
Hi Mark, we just enjoyed your pictures, especially the one in 1955, how well we remember your sweet smile. So good to see the boys and Valerie. May the Lord continue to bless you and your family abundantly. Much love, Georjean & Jean
Jean and Georjean Allenbach <>
Phoenix, AZ USA - Wednesday, February 02, 2000 at 19:31:20 (PST)
I love Buggs Bunny and all of his "friends" I have a big collection of various memorabilia. Just thought to say that.
Jennifer <>
SanAntonio, TX USA - Sunday, January 09, 2000 at 18:48:19 (PST)
(Response from Mark: I didn't understand this entry until I did a Yahoo! search on Buggs Bunny and found's Add to Guestbook page near the top of the list. Thanks, Jennifer! [mk])
Nice page if we can help with other photos/data email.
Matthew Dronfield <>
Sheffield, UK - Tuesday, January 04, 2000 at 00:47:47 (PST)
I like your site. Thanks for making it public.
Henk Hospers, Amsterdam, The Netherlands <>
Amsterdam, The Netherlands - Wednesday, December 15, 1999 at 14:26:49 (PST)
Your web site is one of the most interesting that I have come across. I studied "shells" with Dr Alvin Chronowicz many years ago at Leeds University, UK. I haven't practiced structural engineering for quite a while, but I would love to see a large scale Candela style roof built in the new millenium. I think Felix Candela qualifies as one of the great visionaries of the 20th century. (He visited Leeds university in 1966, it left a lasting impression on me as you can tell). I'm still involved in engineering, but in the business side of industrial developments. If I can be of any assistance with potential projects in Vancouver, Canada, please don't hesitate to contact me.
John Cross <>
Delta, BC Canada - Sunday, December 12, 1999 at 23:09:21 (PST)
(Response from Mark: Candela had that effect. I still remember meeting him in the 1950s when I was just a kid. I would really enjoy designing / building such a roof! [mk])
i am working on the family history. mark and milo are both related to me. i am new to the web. my great grandfather was married to ruma m. pitkin. if you have any info or think you may be related please contact me so i can get all the info. thank you janet
janet krussick <>
show low, az USA - Sunday, December 12, 1999 at 11:43:03 (PST)
Good site. It has lots of info
Bryce Noll <>
USA - Thursday, December 09, 1999 at 16:38:37 (PST)
A real treat to find. (concrete +'thin shell' search) Thank you.
Ian Lynall <>
Princeton, nj USA - Sunday, November 28, 1999 at 21:16:12 (PST)
Hi Mr Ketchum I heared about you from Mr Phillip Chow when I was working with T.Y.Lin Singapore , I am currently designing two interesting bridges in Malaysia , if you are interested to see their graphical models please send me email in return so I can send it to you. Take care Michael
Michael Yamout <>
Kuala Lumpur, Malaysia - Sunday, November 28, 1999 at 00:53:38 (PST)
Hey Mark! Cool web site. Looks like you have fun with what you do. My daughter and I are building a truss bridge for a science project. If any body can help please E-mail me. We'll be back to check out some more neet stuff!
David Fajardo <>
CA USA - Friday, November 26, 1999 at 21:11:39 (PST)
groovy litt web site youve got here. Your bridges kick ass.
Alfie Simmons <>
norwich, u.k - Friday, November 05, 1999 at 04:28:38 (PST)
(Response from Mark: Hey Alfie I'm getting deja vu all over again. [mk])
Hey Mark! Great site. Looks as though you have worked on alot of really interesting projects. I am a Civil undergrad at Tufts University doing a year abroad in London. These crazy Brits want me to write an ESSAY on any bridge dealing with its contributions to civ. engineering and bridge construction. Do you have any shining ideas that would guarentee me an A? Thanks for your help! - Emelie
Emelie Healy <>
London, UK - Saturday, October 23, 1999 at 14:12:08 (PDT)
Congratulations on the site, and projects you've completed. I'm a final year student in Civil and was wondering if there are any sites, detailed in or specific to Bridge engineering in high wind zones? Thanking you.
David O' Reilly <>
Dublin, Ireland - Monday, October 18, 1999 at 11:40:54 (PDT)
Hay! Mr.K! Neat website u've got here! Plus your bridges kick ass!
Alfie Simmons <>
dereham, Great Britain - Friday, October 08, 1999 at 04:30:19 (PDT)
(Response from Mark: I have since concluded that Alfie must have a short memory (see three messages up). [mk])
Hello, I am a member of The International Association of Bridge, Structural, and Ornamental Ironworkers. Local 433 Los Angeles. You keep designing and we'll keep putting them up. Great site.
Darin <>
USA - Wednesday, September 29, 1999 at 18:55:42 (PDT)
(Response from Mark: Shall do! [mk])
you are cool
Frank <Kinnikinnick>
rosco, il USA - Wednesday, September 29, 1999 at 06:57:25 (PDT)
Just surffin through... Love that Bridge Stuff.
Rodney Carey <>
Mendota Hts., MN USA - Sunday, September 19, 1999 at 06:21:19 (PDT)
Nice to meet you by net, thanks for the information about your web site, now It is the last one in the list of links in my web, but is the best.
Manuel González (Cash) <>
Madrid, X Spain - Saturday, September 11, 1999 at 14:11:16 (PDT)
(Response from Mark: Cash's site is a worthwhile visit. [mk])
I was looking for Ketchum, Inc Fund-Raising Consultants, but found Mark. Nice website. I'm off to find a fund-raising consultant.
Lee Hicks <>
Lion's Head, ON Canada - Thursday, September 09, 1999 at 18:14:13 (PDT)
(Response from Mark: Thanks. Try [mk])
Who's your Bunny?
The Branson Bunny <>
Montgomery, AL USA - Friday, August 27, 1999 at 17:49:39 (PDT)
Hello Mark. Just wondering if you're the same Mark Ketchum I went to school with (Bucknell University) sooooo... many years ago! If you are, do you stay in touch with anyone? Looks like you've had an interesting career.
Phil Kirchner <>
Portland, Me USA - Monday, August 23, 1999 at 12:09:09 (PDT)
(Response from Mark: yes, not really, thanks! [mk])
Dear Mark: Your site is excellent. I found it from a list of top sites sent to me by my technical book supplier. They send out a list of web picks to every customer in Austrailia so you will probably get a lot of hits. I have a book on Thomas Telford published by the Iron Bridge Gorge Museum Trust Trust which and details the design of the Menai and Runcorn bridges. Of interest is the calcuations by Telford on the power of suspension cables. Regards Harvey
Dr Harvey Flitt <>
Brisbane, Qld Australia - Tuesday, August 10, 1999 at 18:20:21 (PDT)
Mark, this is a very well done project. I am impressed with the volume of information backed with beautiful pictures. I am a structural engineer myself and I do appreciate the efforts you put into it. How do you find time between preparing plans, specifications, field investigations, meeting with clients, and resolving constructions errors and family. Do you sleep man? (Just kidding) It is obvious that you have love and passion for what you do. The profession needs many more such as yourself.
Lutfi Mized <>
Cape Canaveral, fl USA - Saturday, July 24, 1999 at 13:02:49 (PDT)
(Response from Mark: Gee, my clients ask, "Were you asleep, or what?" [mk])
A very interesting site. I enjoyed surfing thru the pages, expecially the ones dedicated to shells. Greetings from Florence.
Giacomo Melani <>
Florence, Italy - Saturday, July 17, 1999 at 15:41:22 (PDT)
great appearance at the web!!!!!!! congratulations from vienna/austria/europe vienna-ernie 95 r 100 rt "The Green Princess" PS: i´m a member of the bmw-digest-mailinglist: any hint, how i can mail any comments or clues? pls message me, thnks
vienna-ernie <>
vienna, austria/europe - Tuesday, July 06, 1999 at 10:54:26 (PDT)
Hello my friend: I am a Bolivian Civil Engineer, congratulations for your nice work. I hope some day meet you and cross your bridges.
Francisco Vasquez Ramirez <>
La Paz, Bolivia - Saturday, June 19, 1999 at 15:26:06 (PDT)
Hey, just found your page looking up old plans for the Eads bridge here in St Louis . We are doing a deck replacement project on it ,to open it back up to vehicle traffic. probably boring to a designer of your stature but I enjoyed ck ing out your site . N.E.Carson superintendent, St Louis Bridge co.
nick carson <>
st louis, mo USA - Saturday, June 05, 1999 at 21:56:56 (PDT)
Crystal clear originality. Congratulations. Last year we crossed Rhode's bridge over the Victoria River and the first iron bridge - in what was then the black heart of England. Now there is a railway bridge in Scotland which intrigues. The famous 300m long Glenfinnan viaduct [circa 1900] in which Robert MacAlpine pioneered the use of concrete as a sructural material 'on a grand scale.' Perhaps you may have some historical notes on this??? Best regards. Neil Weenink.
Neil Weenink <>
Gold Coast, Australia - Saturday, May 15, 1999 at 14:34:49 (PDT)
Great site, deserved comments and still a motorcycle nut. I spoke with Carl the other day and he directed me to this web site. Glad to see that you are obviously well and are still inspiring others as I remember from the TYLIN days. Remember our rafting trip down the Russian River? I still feel the sunburn. All the best. Tim Mangan architect's office

Tim Mangan <>
San Francisco, CA USA - Monday, May 10, 1999 at 08:36:06 (PDT)
Interesting site. Its been a big help with my sons third grade bridge project. If you have any other bridge related sites that you could e-mail me I'd appreciate it. Gerry Dickerson
Gerry Dickerson <>
Stanhope, NJ USA - Sunday, April 25, 1999 at 12:15:44 (PDT)
Thanks for the wonderful bridge photos. I share your enthusiasm. I detail segmental and cable stay bridges and this was a real treat. I bathed in the asthetics of these structures. You are a true "Renaissance Man".
Leslie Romero <>
Tampa, FL USA - Friday, April 16, 1999 at 15:23:03 (PDT)
Greetings from Connecticut: Your site fits your personality! I guess Marcia and I didn't totally warp you by torturing you when you were small and you seem to have recovered nicely from spilling red wine all over my carpet.
Liz Petry <>
USA - Saturday, April 03, 1999 at 10:44:05 (PST)
(Response from Mark: 1) yes you did, 2) but did you? [mk])
Hi, I was surprised to find a Ketchum websit. I am wondering if we are related?
Lilyan Ketchum <>
USA - Monday, March 29, 1999 at 19:27:09 (PST)
found your site through the higher intelligence sharings between you and Roozbeh on the IBMWR. Enjoyed reading the bridge and concrete shell design pages as well as the link to the Dead Persons site. Of course, any New Yorker has to love bridges, and I note with respect the passing this week of the man responsible for the Verrazzano Narrows Bridge. What a career he had. Well done on the pages. F650
mark mattison <>
new canaan, ct USA - Tuesday, March 09, 1999 at 12:46:37 (PST)
Just stopped by to introduce myself. I fly helicopters for employment, but ride an R1100RS for living. Good site. Adios
Vincent DiGaetano <>
Pocatello, ID USA - Wednesday, March 03, 1999 at 20:28:22 (PST)
Hello, Congratulations for your Site! It is very interesting. I am a structural engineer and I am very interested in the design of bridges. Silenio M. de Paulo
Silenio Marciano de Paulo <>
Goiânia, GO Brazil - Wednesday, March 03, 1999 at 06:44:24 (PST)
Yoa! Mark:
Just checking in with you and your fabulous website. Jacques Overhoff and Elfriede were in town last week from Germany . . . I hope you at least has an opportunity to chat with him/her. . . unfortunately my blockbuster development team (Mentmore/Mills, Patri/Demars, etc.) for the Ferry Building renovation lost out to Wm. Wilson Assoc. of San Mateo w/Kathy Simon as architect. EXTREMELY disappointing after 14 months work and a couple $100k in expenses. But, I look forward to the new freedom of direction. . . Your site has grown considerably since last summer; how do I reach you via standard E-mail for more personal conversation? Since we are still working on the same side of town, let's get together. . . would love to see ya. Enough on the wall . . . E-mail or call: (415) 433-0870 . . . hope to see you soon. All the best. soon . . . --- CARL p.s.: I saw Reinhard downtown the other day; I see by his message below ... he hasn't changed!)

Carl P. Maletic <>
San Francisco, CA USA - Thursday, February 25, 1999 at 18:51:50 (PST)
(Response from Mark: email me at [mk])
Just passing through the neighborhood and saying hello. Still remember me from T.Y. Lin in the early 90's? Very nice site! This is the first personal Web page I've ever seen that doesn't hurt my eyes. I definitely like those icons for the major sections of the site. The motorcycle one looks like a member of "Farvergneugen" school of icon- ography. Still with OPAC? The Web page looks like work on it had been abandoned in late '97. I didn't know about this page until I fed your name to AltaVista. One quick nit: You should rename the "Submit Query" button in the guestbook section of the site.
Kason Leung <>
San Francisco, CA USA - Wednesday, February 17, 1999 at 03:16:32 (PST)
(Response from Mark: Hi, Kason. 1) yes, 2) did it. [mk])
My daugher, age 9, 4th grade has a science project due 3/1/99. We are desperately looking for help finding a model of a cable stayed bridge that she could use as the "plans" to build her own model cable-stayed bridge. Last year she build a bow-string arch bridge out of straws that actually held quite a bit of weight. We need a design upon which to base her model and cut out piece of balsa wood or other materials to make the model bridge. We are looking for the bridge to be about 2 feet long. Any suggestions in a hurry? Please reply to my e-mail or work # 314-534-4200, ext. 1273. Thank you for any assistance or suggestions.
Jeanne Philips-Roth <>
St. Louis, MO USA - Sunday, February 14, 1999 at 12:48:03 (PST)
(Response from Mark: I sent these folks some plans. [mk])
Greetings from undergraduate Engineering Students of Saint Mary's University. Found your page to be very interesting and helpfull. Need more information like this available on the Web.
Don Hartlen <>
Halifax, NS Canada - Sunday, January 31, 1999 at 19:48:20 (PST)
We are working on pendulums and were very interested in your page!!!! We would love it if you could come and talk to our class about the unlimited knowledge you seem to have in this topic....Convent of the Sacred Heart High e-mail us!!!! signed katy
Mr. Birndorf's honors physics class <>
san francisco, ca USA - Tuesday, January 05, 1999 at 12:46:13 (PST)
We are working on pendulums and were very interested in your page!!!! We would love it, if you could come and talk to our class anout the unlimited knowledge you seem to have in this topic....Convent of the Sacred Heart High e-mail us!!!! signed katy
Mr. Birndorf's honors physics class <>
san francisco, ca USA - Tuesday, January 05, 1999 at 12:44:39 (PST)
Hallo Ich betreibe eine Bar in Österreich, und ihr klingender name ist "The Bridge" Nun fand ich Ihre Homepage, und konnte so an wertvolle Bilder für meine Bar kommen. Da ich diese Bar mit Fotos und Bildern von Brücken dekoriere, Würde ich mich freuen, wenn Sie noch mehrere hätten. Meine Addy.: Günther PETSCHACHER Bar " The Bridge " A-9371 Brückl Europa
Günther Petschacher <>
St.Veit, K Austria - Wednesday, November 18, 1998 at 18:39:43 (PST)
Matt gave me Milo's web page address, I ended up here. I now live a few blocks from you at Sonoma(Hopkins) and Josephine. I would like to see your office sometimes.
Brian Blum <>
Berkeley, CA USA - Tuesday, October 27, 1998 at 13:51:59 (PST)
Matt gave me your familys web address. you look like your brother my Father is also an engineer,I will share your site with him
matts neighbor <>
denver, co USA - Sunday, July 05, 1998 at 22:44:36 (PDT)
hi mark! i got your address from jim norden. im showing your stuff to our young(er) engineers here at martin martin, fka ketchum konkel et al. next were going to visit milos site. regards from all of us.
chuck keyes <>
denver, co USA - Wednesday, July 01, 1998 at 10:55:15 (PDT)
(Response from Mark: Hi Chuck! [mk])
Congradulations . . . on a very well balanced web site. (But what do we expect from an expert bridge engineer? BALANCE!! of course!) It's a pleasure to view all those smiling faces and bouncing bridges. Looking forward to viewing more in the future and will attempt to add some visuals of my own. Now . . . back to work!
Carl P. Maletic <>
San Francisco, CA USA - Wednesday, June 10, 1998 at 16:46:31 (PDT)
Great pictures, we all love you
Marcia and Susan, Sam, and Tim <>
Denver, CO USA - Monday, May 25, 1998 at 14:57:08 (PDT)
A great german engineer visited the site today looking for a sign---a message --- from a sage---- a guru I found him, it
Reinhard Ludke <>
San Anselmo, CA USA - Tuesday, April 14, 1998 at 16:52:57 (PDT)
I think it looks great. The only possible change I would make is to put the captions under the pictures. I realize that you did not know how wide the pictures were to be. GOOD!
Milo Ketchum <>
USA - Tuesday, April 07, 1998 at 13:37:23 (PDT)
Grew up in the BA (Marin). Looks to be about the same decade old as you are. From the placement and content on your web page (nice, BTW), it appears you love your job. Wish I could say the same. (Banks since '68). But BMWs supreme diversion.
Bill Keener <>
Coarsegold, CA USA - Monday, April 06, 1998 at 23:00:06 (PDT)
I see that you got my pictures and have the descriptions on the web. good work I will be interested to see how the pictures come out.
Milo <>
USA - Saturday, April 04, 1998 at 16:24:52 (PST)
Mark: This is a great IDEA. It makes it a lot more personal than just viewing a site. (The word wrap did not occur when I thought it should. I was a little confusing so I am trying it some more to see what happens. I didn't)
Milo (No nickname) Ketchum <>
Denver, CO USA - Sunday, March 29, 1998 at 12:54:27 (PST)

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