The architectural Mexicans, Central Americans, and especially the Peruvians, had no derricks or other hoisting devices, but rolled great stones into place along prepared ways and up inclined planes of earth, which were afterwards removed. [Please select]
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There were great scarred marks on the deck-planking over which the cargo-derricks had been hauled. [Please select]
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The windlass derricks are made with four legs out of 6×6-in. [Please select]
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The piles were swung from the molding platforms and set by derricks and block and fall. [Please select]
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The force on the derricks consisted of two enginemen, four tagmen and the fireman. [Please select]
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, and by cars and derricks any height, were as follows: By hand (barrows) below 12 ft. [Please select]
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Altogether nine derricks were used in the bridge, four having 70-ft. [Please select]
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