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 149
Pig. 3. Erasing Sliield Fig. 4. Metal Erasing Sliield long and i to | 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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