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 43
s of all therest. Hence, if D E be the chord, sine, or tangentKi^,. oc. of any arc, or of any number of degrees to the radius A D, tlien B C will be the same to the radius A 1^. Tlius at everyojxuiiiir <»i llic sector, tlic frdnsrrrsc distances 1) E and C B from one rulerto aiiotlicr, arc… … DKAAVIXG INSTKUMENT3. 23 The line of lines^ marked L on each leg of the sector.—^Tliis is a lineof 10 primaries, each subdivided into tenths, thus making 100 divisions.Its use is, to divide a given line into any number of equal parts; to giveaccurate scale measures for the construction of a…
