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 49
ANICAL 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 carrying… … Fig. 9. Drawing an Arc of rather Large Radius by using Compass andLengthening or Extension Bar ing the pencil-holder or pen is adjusted at any point alongthe beam that may be required for the radius of the arc orcircle to be drawn. Only a small section of the beam is shownin the illustration.…
Mechanical drawing
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