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 34
DEAWmG INSTRUIVIENTS. 13 I … Fig. 45. The annexed engraving a tube adapted to hold a piece of lead pencil for describing circles or arcs, and the dotting point consists of two blades, between which revolves a small wheel, with numerous points round its circumference, resembling the rowel of a spur. The space between the blades…
