Hill, John A. (John Alexander), 1858-1916, Sinclair, Angus, 1841-1919 · New York : American Machinist Pub. Co · leaf 858
e direct steam is admitted toIhe big cylinders at reduced pressure, but with suf-ficient tension to materially increase the power.This is practicable when used merely to make adifficult start, or to prevent stalling, allhougb theboiler would not have capacity lo provide steamdirect lo Ihc big… … This device has an improved operating valvethat makes ils aciion positive, and ils speeil entirelyin Ihe hands of operator. These hoists are preferably handled with com-pressed air, but any fluid present may be used. Their usefulness is not limited to lifting, butthey are worth half a dozen hands…
Railroads · Locomotives
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