Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 805
the pole, the necessary power being applied byhorses operating through the intervention of a snatch-block. Figs.559. 560 and 561 show such a derrick wagon, these cuts being madefrom photographs loaned by W. H. Anderson & Sons, of Detroit,Mich., who manufacture the wagon. As will be seen, the… … FIG. 556.—RAISING POLE.
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