Handbook of construction plant, its cost and efficiency (1914)
Dana, Richard Turner, 1876-1928 · Chicago, The M. C. Clark Publishing Co. · leaf 314
eway on which the scraper bucket travels back and forth EXCAVATORS 309 across the canal, being pulled toward the tower by the haulingline and sliding back by gravity. The Tower. The tower is a framed timber structure of heightsuitable to cover the width of the excavation for which it isintended… … S/TfCM/f. 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…
Contractors' operations · Building
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