Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 87
he center or hub only is of cast iron, the armsbeing of wrought iron cast into the hub, while therim is of sheet iron. The arms of pulleys when made of wrought ironare invariably straight, but when made of cast 84 MECHANICAL DRAWING iron they axe very often curved. In Fig. 166 whiclishows an… … -2^2 .yy :—-->K- —-:-- 5^ T--r,rH
Mechanical drawing · Machine design
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