Appleton's cyclopædia of drawing, designed as a textbook for the mechanic, architect, engineer, and surveyor (1866)
Worthen, William Ezra, 1819-1897, [from old catalog] ed, Appleton, firm, publishers, New York. (1866. D. Appleton & co.) [from old catalog] · New York, D. Appleton and company · leaf 104
nce of an outline drawing may,however, be considerably increased, by strengthening thoge lines which in-dicate the contours of surfaces resting in the shadow; and this distinctionalso improves the general appearance of the drawing. Tlie strong lines, toproduce the best effect, ought to be laid upon…
