Parabolic Arches
|
Title |
Parabolic Arches |
|
Description |
The parabolic arches of the dam bridge have a clear span of 135 feet and a rise of 17.25 feet. Each arch barrel varies in thickness from 3 feet at the abutments to 18 inches at the crown, and is 30 feet 2 inches wide." When these arches were poured they were divided into seven sections numbered 4, 2, 3, 1, 3, 2, 4 from one end to the other, and the sections poured in numerical sequence. This was to facilitate curing, and also to assure that each section of the span assumed its permanent shape and due proportion of the load." A lattice work composed of more than a million and a half board feet of heavy timbering filled the drum gate bays during these final concreting operations." In the foreground is Frank B. Pomeroy, a U.S.B.R. photographer in action. |
|
Date Original |
1930/1945 |
|
Author |
Koester, Clifford R.; photographer unknown |
|
Library of Congress Subject Headings |
United States--Washington (State)--Grant County--Grand Coulee Dam site; United States--Washington (State)--Grant County--Grand Coulee Dam |
|
TGM Subject |
Railroad bridge; Vehicle bridge; Pedestrian bridges |
|
Type |
Image |
|
Genre |
Photographs |
|
Geographic Area |
United States--Washington (State)--Grant County--Grand Coulee Dam site |
|
Identifier |
cg709b1v3p328-B.jpg |
|
Source |
Is found in A History of the Columbia Basin Project (vol. 3, pg. 328-B), Cage 709, Clifford R. Koester Papers http://libraries.wsu.edu/masc/finders/cg709.htm at Washington State University Libraries' Manuscripts, Archives, and Special Collections (MASC) http://libraries.wsu.edu/masc |
|
Rights |
http://rightsstatements.org/vocab/NKC/1.0/ |
|
Rights Notes |
No known copyright. Item is in public domain as it was created by United States government. |
|
Digital Format |
Original photographic prints were scanned at 24 bit 3000 pixels by the long side for master TIFF files on an Plustek OpticBook 3600 Plus. Also, 24 bit 150 PPI JPEGs were created with the OpticBook 3600 Plus and added to the CONTENTdm database at the WSU Libraries |
|
Notes |
Part of Western Waters Digital Library, http://westernwaters.org/ |
|
Language |
English |
|
Rating |
|
Add tags for Parabolic Arches
you wish to report:
...
