Blessing, George F. (George Frederick), 1875-1921, Darling, Lewis A. (Lewis Andrew) · New York, J. Wiley & sons; [etc., etc.] · leaf 37
15. Erasers and Erasures. Erasers are used for removingpencil or ink lines and for cleaning the drawing. The pencil eraser should be made of soft, fine-grained rubber,free from sand or grit, and of a texture that will not glaze, smear,or injure the surface of the drawing. The ordinary ink eraser is…
Mechanical drawing
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