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 48
bow instrument is held in Fig. 5.The circle should be drawn by rotating the instrument in a clockwise direction. Indrawing heavy ink circles,it is usually necessary tobegin the rotative move-ment before allowing thepen point to touch thepaper, as otherwise the inkmay leave the pen andcause a blot.… … 36 MECHANICAL DRAWING the lengthening bar is employed, the instrument should beheld by both hands. Beam Compass. — Circles beyond the range of an ordinarycompass are drawn with the beam compass shown at E, Fig. 6.This is the usual type of beam compass and consists of a beamor strip of hard wood…
Mechanical drawing
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