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Re: Negative Structures.

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According to the book "The great bridge" , by David McCullough , the
Roeblings (father and son )  copied the caisson system from works that
were being executed in Europe at that time.
The book has a great description of the sinking of the caissons for the
Brooklyn bridge.

Juan C. Gray

Harold Sprague wrote:
> This is similar to the construction of the "caissons" for the Brooklyn Bridge which was done by pressurizing the wooden caisson chambers while they were stacked with masonry, sunk to the mud line, hand excavated.  The pressurized chambers resulted in the workers becoming ill from "caissons disease" or as us SCUBA divers call it; the bends.
> The scheme for the caisson construction was developed in the 1850's and 1860's by John Roebling who died in a construction accident.  His son Washington Roebling completed the construction and was himself stricken by caissons disease in 1872, but lived to see the bridge completion in 1883.
> I believe that this was the first time this method of construction was used.  Back in those days you did not quit when the CD's were done.  Engineers also tended to die, and become crippled at the same rate as the construction workers.
> Remind me to let someone else do construction observation.
> Former iron worker and current engineer,
> Harold Sprague
> Krawinkler, Luth & Assoc.
> 4412 W. Eisenhower Blvd.
> Loveland, CO 80537
> Voice: 970 667-2426
> Fax: 970 667-2493
> Email: hsprague(--nospam--at)