Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 18
means of a sand-rub-ber, which is known as an ink eraser, but never byscratching the surface of the paper with a knife. As all drawing inks dry rapidly, and should notpenetrate the surface of the paper, the object inerasing is to remove the ink from the surface ofthe paper without injury to it. An… … Fig. 23—Erasing Guard or Shield. ing an mked line from the surface of the drawingpaper, consists of a thin sheet of flexible metal,usually brass, provided with slots and holes ofvarious shapes and sizes. The shield or guardpermits erasures to be made of limited size with-out damage to the rest of…
Mechanical drawing · Machine design
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