Kidder, Frank E. (Frank Eugene), 1859-1905, Nolan, Thomas, 1857-1926 · New York : W.T. Comstock · leaf 398
The manufacturers ofthe Norris pulleys make probably the greatest variety, several of theirgrades being of great excellence of construction. They are madefor cord, tape or chain, the chain wheels having a groove especiallydesigned to fit the usual shape of chains. The Gardner Sash-Balance Co., also… … Fig. 420.—Norris SashPulley. 392 BUILDING CONSTRUCTION. necessitates a different shape for the case. The first overhead pulley (ShuUs) was patented in August, 1895, and was placed on themarket early in the same year. Overhead pulleys certainly possessadvantages over the side pulley, and their use…
Building
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