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| Keywords: Concrete gun carriage used in placing 110 degree top-arch concrete in diversion tunnels - NARA - 293688.jpg Scope and content Photograph from Volume Two of a series of photo albums documenting the construction of Hoover Dam Boulder City Nevada Full caption of photo reads Concrete gun carriage used in placing 110 degree top-arch concrete in diversion tunnels Concrete is hauled by truck in dump-buckets into position under carriage hoisted to upper deck by bridge crane operating over head dumped into hoppers and compelled into forms by compressed air through two 8-inch steel and rubber pipes Two gun units are operated one from either side of deck The entire assembly consists of three major units the concrete gun carriage seen in the photograph a traveler carriage used to support the compressed air pipes between the gun carriage and the form and the form carriage itself All three units operate over rails placed on tunnel alignment The form carriage is given flexibility for curve construction through a system of gores and wedges See also following photographs General notes 293688 Local identifier Department of the Interior Bureau of Reclamation Engineering and Research Center 05/18/1981 - 03/04/1988 NARA's Rocky Mountain Region Denver NRGA Building 48 Denver Federal Center West 6th Avenue and Kipling Street Denver CO 80225-0307 1932-06-30 Record group Record Group 115 Records of the Bureau of Reclamation 1889 - 2008 Record group ARC 444 Photograph albums compiled 1903 - 1972 Series ARC 293611 File unit File unit ARC Variant control numbers NAIL Control Number NRG-115-CONSTPHO85006-BC21303 Other versions <gallery> File Concrete_gun_carriage_used_in_placing_110_degree_top-arch_concrete_in_diversion_tunnels_-_NARA_-_293688 tif tif File Concrete_gun_carriage_used_in_placing_110_degree_top-arch_concrete_in_diversion_tunnels_-_NARA_-_293688 jpg jpg </gallery> NARA-cooperation PD-USGov New Deal | ||||
