Blessing, George F. (George Frederick), 1875-1921, Darling, Lewis A. (Lewis Andrew) · New York, J. Wiley & sons; [etc., etc.] · leaf 52
, celluloid,brass, German silver, or steel.The two latter materials are themost satisfactory. Fig. 33 illustrates the style ofprotractor in most general use,but more elaborate designs maybe had. To use this protractor, place Fig. 33.-ordinary Protractor. it so that the two zero marks coincide with… … 32 ELEMENTS OF DRAWING angle with the given Hne, use a cone-pointed pencil (see page 15,§ 14) and mark a very fine point on the drawing just at theouter edge of the protractor and opposite the desired angle-division on the scale, and a line drawn through this point andthe point C will make the…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
