Handbook of construction plant, its cost and efficiency (1918)
Dana, Richard Turner, 1876-1928 · New York, McGraw-Hill book company, inc., [etc., etc.] · leaf 318
Hoqcq-<!f<oo*cqMcOT CjT)<OOrH-*<THrHOOOOiH-<*<rHCq; <!WOQHf^OWM»^«H:i§^OPkC? p:j w&hP>^><>^n5^^ - = ^5 X x^ . - O) oo > O 13 W 313 314 HANDBOOK OF CONSTRUCTION PLANT The Tower Excavator.* The principal parts of this appa-ratus are a hoisting engine; a tower… … Fig. 123. Tower Drag-Scraper Excavator. stationary, they slide on other cables stretched parallel to theditch and fastened to deadmen, thus giving stability to the tower,while allowing it to move parallel to the ditch; the scraper
Contractors' operations · Building
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