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 47
ioish scales (fig. 69).—^These scales consist of a right-angled tri-angle, of which the hypothennse or longest side is three times the lengthof the shortest, and a rectangular rule. Our figure, which is drawn one-third the actual size of the instruments from, which it is taken, repre-sents the… … within this, the outer being termed the artificial, and the inner the natm-alscale. Tlie divisions upon the outer scale are three times the length ofthose upon the inner scale, so as to bear the same proportion to each otherthat the longest side of the triangle bears to the shortest. In the…
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