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 29
JJ Fk … Fig. OT. DRAWma INSTRUMENTS. tact, tlie more accurately may tlie parallelism be preserved in sliding the triangle. The T square is a tliin straight edge or ruler, a, fitted at oneend with a stock, Z», applied transversely at right angles. Tlie stockbeing so formed as to fit and slide against one…
