American machinists' handbook and dictionary of shop terms : a reference book of machine shop and drawing room data, methods and definitions (1914)
Colvin, Fred H. (Fred Herbert), 1867-1965, Stanley, Frank A. (Frank Arthur), b. 1874 · New York : McGraw-Hill book company ; London : Hill · leaf 552
inches in diameter the distance betweenthe holes will be 7 times 0.684 or 4.788 inches. This is very quickand the most accurate method known. Draftsmen often lay out jigs with the angles marked in degreesas in Fig. 6, overlooking the fact that the toolmaker has no conven-ient or accurate protractor… … Fig. 7 524 SHOP TRIGONOMETRY As the known radius is from a to 6, the distance b c is the tangentof the angle and the tangent for a one-inch radius is .36397, so for a3-inch radius it is 3 X .36397 = 1.09191 inches from 6 to c and atright angles to it. But we need not depend on the accuracy of the…
Machine-shop practice
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