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 91
perdot-line FOG, just to reachthe extremity, C, of the conju-gate axis. Place a pencil ordraw-point inside the cord, asat H, and guiding the pencilin this way, keeping the cord equally on tension, pass round the twopoints F, G, and describe the curve as required. Tliis method is employed in setting…
