San Francisco : Architect and Engineer, Inc · leaf 744
>-;w% *.A^ - A ^ ^r - ^v. ^y \ 1 * - 1. ^\ ( i f^ s ^. r j … POURING CONCRETE IN HETCH-HETCHY DAM, NOVEMBER. 1921 loaded into the skips by hand. The skips were emptied into trains run-ning on trestles along the north and south walls of the gorge. Excavation on the sidewalls and in the cutoff trench above the streambed level was carried on by diilling with…
Architecture · Building
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