Archival objects in this container: Caterpillar 60 with bull-dozer in front and cow-dozer aft, used extensively for moving muck: photographic print, 1932 March 08 Dumping materials at temporary pile bridge to complete diversion of Colorado River: photographic print, 1932 November 13 Flashlight photograph of drilling jumbo working on invert excavation at upper portal of diversion tunnel Number 4: photographic print, 1932 March 08 Forms were constructed in 11-foot sections and transported to Arizona side by overhead cableways: photographic print, 1932 June 18 High scalers perched on bench 1000 feet above river prepare anchorages from which workmen will be suspended by ropes in scaling canyon walls for penstock tunnel adits: photographic print, 1932 August 22 Huge billows of rock and dust pour over canyon rim and descend to river below: photographic print, 1932 August 24 Interior of diversion tunnel Number 2, near upper portal. Invert and side wall sections of lining have been completed. Two cubic yard buckets for pouring concrete are shown on truck: photographic print, 1932 June 02 Looking across river at lower portal of diversion tunnel Number 3: photographic print, 1932 February 10 Lower portals of diversion tunnels Number 3 and 4, after diversion of Colorado river was completed: photographic print, 1932 November 14 Lower steel suspension bridge under construction: photographic print, 1932 January 25 Marion electric drag line with 5 cubic yard capacity bucket, loading gravel: photographic print, 1932 February 10 Telephoto photograph, similar to photograph number 1055, to the left: photographic print, 1932 March 28 Ten-car train of gravel crossing 1100-foot trestle bridge and bound for screening plant. Round trip take slightly over two hours: photographic print, 1932 May 03 Three hundred boxes of dynamite were used in spectacular blast which demolished the old Lookout Point. Photograph taken from the new Lookout Point, on Black Canyon Highway: photographic print, 1932 August 16 Upper portals of diversion tunnels Number 1 and 2. Note workmen scaling above portal of diversion tunnel Number 1: photographic print, 1932 March 07 View of invert forms in upper diversion tunnel Number 3 showing method of pouring slabs. Trimming jumbo for aligning gauge of tunnels in background: photographic print, 1932 March 18 View showing forms set for first side-wall pour in upper portal of tunnel Number 3. Form is 80-feet long and consists of four 20-foot sections bolted together. Note size of man in upper right: photographic print, 1932 April 29 White truck dumping near site of Nevada spillway cut and extending road the for muck disposal: photographic print, 1932 March 16 Blast on Arizona intake tower excavation, which has filled canyon with smoke and dust. Upper steel suspension bridge shown in background: photographic print, 1932 August 16 Blasting usually scheduled for 11:30 a.m., and billowing dust dislodged from canyon rim completely fills the canyon: photographic print, 1932 August 16 Detail photograph, showing method of construction and operation of side-wall jumbo for placing lining in diversion tunnels: photographic print, 1932 June 29 First 40-foot slab of concrete poured in lining diversion tunnels: photographic print, 1932 March 18 First train loaded with gravel leaving gravel pits for screening plant: photographic print, 1932 February 10 Locomotive equipment of Six Companies, Inc. on yard at gravel plant: photographic print, 1932 May 15 Looking across river from Arizona side at upper portals of diversion tunnels Number 1 and 2. Truck bridge in foreground has been partially washed out: photographic print, 1932 February 10 Load More
