Mechanical drawing; a treatise on the drawing of mechanical and machine details (1920)
Jones, Franklin Day, 1879-1967 · New York, The Industrial press; [etc., etc.] · leaf 44
d be held in contact with the straight-edge with only sufficient force to prevent it from leaving theguiding edge. The pen is usually inclined in the direction inwhich it is moving as indicated in Fig. 2. Some draftsmen,however, prefer to hold the pen in a perpendicular position.Short lines should… … Fig. 4. Setting Bow Pencil to a Given Radius to be drawn. The spring bow pencil and spring bow pen areordinarily used to draw circles up to 1 \ or 2 inches in diam-eter. The construction of spring bow instruments variesslightly, but they are all alike in their more important details.They consist…
Mechanical drawing
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