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 72
sat A and B, andhaving D at theirintersection; fastenthe two strongly to-gether at this point and at the base of the triangle by the third strip ; plac-ing the pencil at D, and keeping the edges against A and B, moving thetriangle to the right and left, the pencil will describe the circle. PuoB.… … Fig. 103.
