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 505
t the first line at h as points in the line of shadow. Plate LXXXI., figs. 1, 2.—To find the line of shade in a sphere, andthe outline of its shadow cast upon the horizontal plane. Tlie line of shade in a sphere is simply the circumference of a greatcircle of wliich the plane is perpendicular to… … kl-. SHADING AND SHADOWS. 325 the major axes of wliicli are obviously the diameters C D and C D, drawnat an angle of 45°. To find the minor axes of these curves, assume any point O, upon theprolongation of the diameter of the perpendicular C D (fig. 2), drawthrough this point the straight line O o\…
