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 100
y can the curve be drawn. The involute curve may be described mechanically in several ways.Thus, let A (fig. 176) be the cen- ^tre of a wheel for which the fonnof involute teeth is to be found.Let m n a he a thread lappedround its circumference, havinga loop-hole at its extremity cCjin this fix a… … The Spiral. The spiral is the involute of a circle produced beyond a single revolution. Peob. LXX.—To describe a spiral (figs. 5 and 6, plate XII). Divide the circumference of the j)rimary into any number of equalparts, say not less than eight. To these points of division e^f, ^, (fee,…
