Blessing, George F. (George Frederick), 1875-1921, Darling, Lewis A. (Lewis Andrew) · New York, J. Wiley & sons; [etc., etc.] · leaf 50
rty-seconds, etc., and the scale is used formaking all drawings of objects which are to be dimensioned inthe ordinary foot-rule denominations. This includes practicallyall mechanical drawings. The best scales are made of boxwood and have beveled edgeslined -wdth a white material resembling ivory.… … NEEDLE pomrFig. 30.— Ordinary Bow Pen. 30 ELEMENTS OF DRAWING scale of triangular cross section. The latter form is shown inFig. 31 and has the advantage of combining eleven distinctscale divisions on a single instrument. Scales are made of different lengths, but, in order to be providedwith a…
Mechanical drawing
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