Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 19
e made both circular andsemi-circular in shape, the latter being the ordi- nary and most commonly used form, as shownin Fig. 26. Protractors are made of paper, horn,brass, German silver and steel. Protractorsusually have their edges bevelled so as to bringthe divisions on the scale close to the… … Fig. 26—German Silver Protractor. be readily applied to the point at which it isdesired to read or lay off an angle. Drawing Boards. A drawing board for ordi-nary use should be about 20 by 27 inches in size.The material should be of first quality clear softpine, free from pitch and thoroughly kiln…
Mechanical drawing · Machine design
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