Elements of geometry and trigonometry. Revised and adapted to the course of mathematical instruction in the United States (1856)
Legendre, A. M. (Adrien Marie), 1752-1833, Davies, Charles, 1798-1876 · New York : A.S. Barnes · leaf 275
e placeone foot of the dividers at I, and extend the other to eand to take off the distance 2.58, we place one foot of thedividers at p and extend the other to q. Eemark I. If a line is so long that the whole of itcannot be taken from the scale, it must be divided, andthe parts of it taken from the… … A^ B 24:. This instrument is used to lay down, or protractangles. It may also be used to measure angles includedbetween lines already drawn upon paper. It consists of a brass semicircle, ABOj divided to halfdegrees. The degrees are numbered from 0 to 180, bothways; that is, from JL to ^ and from B…
Geometry · Trigonometry
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