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 98
tening the divisions of the circular arcs. Tliusthe form of the curve may be determined to any amount of accuracy, andcompleted by tracing a line through the points found. As the distances 1 to c,.... wliich are near the commencement of thecurve, must be very short, it may, in some instances, be… … 2d Method.—^To find the points in the curve, find the positions of thecentre of the rolling circle corresponding to the points of contact 1^, 2^, S\&c., which may be readily done by producing the radii from the centre O, through the points 1\ .... to cut the circle B C. From these centres…
