Handbook of construction plant, its cost and efficiency (1918)
Dana, Richard Turner, 1876-1928 · New York, McGraw-Hill book company, inc., [etc., etc.] · leaf 306
by means of a steelcable anchored to a dead man and wound on a drum driven bythe engine. The A-frame which supports the boom is 20 feethigh. This boom inclines about 45° and may be swung 180°horizontally by a bull-wheel but has no vertical motion. Thebucket is of the clam shell type, one cubic yard… … Fig. 116. Clamshell Dredge Cleaning Canals in Imperial Valley. drives a series of combination gear and friction brake drumscontrolling the motion of the excavating bucket. The machinecost $5,000. Wages of the crew of 5 men and a team duringone month amounted to $305.00. The supplies, which…
Contractors' operations · Building
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