Babbit, Arthur B · New York, H. Holt and company · leaf 13
cils, 311 and 6H Set of drafting instruments Drawing-board—The drawing-board should bemade of soft pine with the left or working edge, theone against which the head of the T square is rest-ing in Fig. 1, perfectly straight. Care should betaken to use the same side of the board each time,and to have… … MATERIAL
Mechanical drawing
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