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 514
ut as it is entirely in the light, it shouldbe covered by a series of much fainter tints than the surface 1) g li <?, whichis in the shade, darkening, however, towards the line ef. The gradationof tint is eficctcd in tlic same way as on the fiice 1) g li c. Let it be proposed to shade a cylinder… … J A Fig.Z. C I 2 b I
