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 120
OEOilETKICAL PROJECTION. 95 Let D S be the axis of the cone, A L B tlie circle of its base, and thetriangle A B S its projection on the vertical plane ; and let C, C, be theprojections of the centre, and the circles E K F and E G F those of thecircnmferences of the sphere. Tliis problem, like most…
