Handbook of construction plant, its cost and efficiency (1918)
Dana, Richard Turner, 1876-1928 · New York, McGraw-Hill book company, inc., [etc., etc.] · leaf 313
rallel to the prism between two deadmen, mov-ing along the cable as the tower moves. This second line is thecableway on which the scraper bucket travels back and forth EXCAVATORS 309 across the canal, being- pulled toward the tower by the hauling-line and sliding back by gravity. The Tower. The… … Fig. 120. Sketches Showing Operation of Field Tower Excavator. rests on a trussed platform or car which carries the hoistingengine, coal and other supplies. The tower is rigidly securedto the truss and guyed by back stays to the projecting back endof the platform. The platform or car runs on four…
Contractors' operations · Building
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