Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 301
ge pulleys. Wrought-iron rim-pulleys consist of a spider—that is, the hub and arms—of cast-iron, and awrought-iron plate-rim is bolted to flanges on the extremities of the arms. Fig. 631 represents a faced coupling pulley, an expedient sometimes adoptedwhen a joint occurs where a pulley is also… … Wooden pulleys called drums are used for pulleys of very wide face. Fig.632 represents one form of construction in elevation and longitudinal section. It consists of two cast-iron pulleys A A, with nar-row rims ; they are keyed on to the shaft at the
Mechanical drawing
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