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 47
be adjusted at the joints, as shown at D, in 34 MECHANICAL DRAWING order to bring these members perpendicular to the paper ordrawing-board. The extension bar shown at B is used indrawing circles which are too large to be drawn with thecompass when equipped only with the pencil point or penpoint.… … Fig. 6. Compasses for drawing Circles which are too Large for the SpringBow Instruments portant instrument should be acquired. When the compassis picked up, the thumb should be placed in the positionshown in Fig. 7. This position permits the instrument to bereadily opened by pressing with the thumb…
Mechanical drawing
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