The technic of mechanical drafting a practical guide to neat, correct, and legible drawing (1904)
Reinhardt, Chas. William (Charles William), b. 1858 · New York, The Engineering News Pub. Co. · leaf 33
Cross Sect/on. Fig 58. gradually at about the rate of 3 to 5; keep on increasing spaces until near center, then stop. When ink on lines just ruled has dried, begin at the oppo-site or dark side ; rule a line about three - fifths the strength of the shaded outline, as near as possible, leaving just…
Mechanical drawing
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