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 130
GEOMETRICAL rROJECTION. The intersection of the plane F G with the cone is projected horizon-tally in a circle described from the centre C, with the diameter F G.The arcs V F^ A and 11^ G B are the only parts of this circle which re-quire to be drawn. Figs. 7 and 8.—To describe the curves formed hj…
