Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 62
Fig. 139. spring, and by means of the screw h it can be moved a very little toward orfrom the fixed point more accurately than by closing or opening the dividers.In dividing a line into equal parts especially, it enables one to divide the excessor deficit readily. DRAWING INSTRUMENTS. 45 For… … Fig. 140. Three-legged dividers (Fig. 140) are convenient, while transferring measuresfrom a drawing to a copy on an equal scale, for locating a third point when twoare established. For setting off very long .lines, or describing circles of large radius, beamcompasses are used (Fig. 141). These…
Mechanical drawing
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