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 373
me points a^ b (fig. 78); bisecta b at c?, and on ac, cb^ describe semicircles. Drawperpendiculars do^ &c., from a number of points inac^cb^ meeting the circumferences ; and from the samepoints set off horizontal lines equal to the respectiveperpendiculars : o n equal io o d for example.… … Fig. 77.
