Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 116
orizon. Thus,in Fig. 228, it will be seen that a horizontal surface receives an equal portionof light with the inclined surfaceresting upon it, and, as the- inclinedsurface is of greater extent, it will bedarker than the horizontal in propor-tion to the inclination and conse-quent increase of the… … the slopes of ground by a scale of shade, the slope, at an angle of 45°, is indicatedby black, the horizontal plane by white. A modification of Lehmanns method, proposed by the United States Coast
Mechanical drawing
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