Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 45
f the distance 2.34, we place one footof the dividers at I, and close the other to e : and to take off the 38 ELEMENTS OF SURVEYING. [book I. distance 2.58, we place one foot of the dividers at p and close theother to q. KoTE 1.—If a line is so long that the whole of it cannot betaken from the… … > Pig. 22. 62. A Semicircular Protractor (Fig. 22) is used to lay down, or protract angles. It may also be used to measureangles included between lines, already drawn upon paper. It consists of a brass semicircle, ABC. divided to haKdegrees. The degrees are numbered from 0 to 180, both ways…
Surveying
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