Pressure grouting jumbo in operation in Diversion Tunnel No. 4. Grout is mixed at location and impelled into the holes by compressed air furnished from the pipe at left. Note connection to hole at left top of jumbo.; Scope and content: Photograph from Volume Two of a series of photo albums documenting the construction of Hoover Dam, Boulder City, Nevada.

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Size: 3739px × 5349px
Photo credit: © Alpha Stock / Alamy / Afripics
License: Licensed
Model Released: No

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