Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 254
Figure 269. —ThePulley as Used inthe Sewing Machine. The second type of pulley is often Cused in lifting safes or other heavyobjects. (Figure 270.) A gin pole isplaced in the window above, and theupper block is fastened to this. By pulling on the free endof the rope the safe is raised to the open… … Figure 270. — A Set of Pul-leys Used to Lift HeavyObjects to the UpperStories of High Buildings.
Physics
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