Blueprint reading; a practical manual of instruction in blueprint reading through the analysis of typical plates with reference to mechanical drawing conventions and methods, the laws of projection, etc (1919)
Fairfield, Howard Parker, 1858-, Kenison, Ervin, Waite, Edward B. (Edward Broughton), 1873-, American Technical Society · Chicago, American technical society · leaf 225
d to a pointalthough some draftsmen prefer to use a chiseledge for the compasses as well as the pencil. In using a very hard lead pencil a light pres-sure should be used as otherwise the chiseledge will make a deep impression in the paperwhich cannot be erased.Erasers. W hat little erasing is… … Fig. 3. Erasing Shield 0 0 Fig. 4. Metal Erasing Shield long and i to J inch wide, Fig. 3. An erasing shield of thin metal,Fig. 4, is also very convenient, especially in erasing letters. Forcleaning drawings when they are completed, a sponge rubber or apreparation called art gum may be used, but in…
Mechanical drawing · Blueprinting
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