Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 766
heet of paper and transfer it by means of graphite paper to the fairsheet, then ink in. If you want a clean, sharp line, the ink must be perfectly black and muststand out alone on the paper. If you want a gray line, it will not be obtainedby using light ink, but by making thin lines. A single thin…
Mechanical drawing
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