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 35
14 DRAWING INSTRUMENTS. … Fig. 48. Fig. 49. Fig. 50. cil bows. Ill fig. 49 there is a second joint A, hy wliicli, wlien the instiU-ment is open for use, the pen may be set perpendicular, or nearly so, tothe paper, which is essential in the nse of the di^aw-ing pen. Similar to fig. 48 in their construction are thespring…
