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 551
hed in proportion to its divergence from the plane of the horizon. Thus in fig. 19, it will be seenthat a horizontal surlace receivesan equal portion of light with theinclined surface resting upon it,and as the inclined surface is ofri„ 19, greater extent, it will be darker than the horizontal in… … TOPOGRAPHICAL DRAWING. 353 In tlie German system as proposed by Major Lelimann, of representingthe slopes of ground by a scale of shade, the slope at an angle of 45°, asreflecting its light horizontally, is supposed to be the greatest ever requiredto be shown, and is represented by black, whilst…
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