Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 48
44 A MANUAL OF MECHANICAL DRAWING. Fig. 3.—A cube resting upon one of its edges withsides at angles of 45° to horizontal. In one face of thecube is a depression i square, ^ deep, while in thecentre of this depression is a further depression, round•J diameter, -J deep, the cube being i^ square…
Mechanical drawing
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