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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 271

An illustration from Elements of geometry and trigonometry. Revised and adapted to the course of mathematical instruction in the United States, 1856, leaf 271 — ipal uses of this instrument is to layoff on a hue, a distance equal to a given line. For example, to lay off on CD a distance equal to AB. For this purpose, place the forefin-ger on the joint of the dividers, and ^i ,3 set one foot at A: then extend, with the thumb and other fingers, the k ig j^… … 19. A Ruler of convenient size, is about twenty inchesin length, two inches wide, and a fifth of an inch in thick- INTEODUCTION. 267 ness. It sliould be made of a hard material, perfectlystraight and smooth. The hypothenuse of the right-angled triangle, which isused in connection with it, should be…

Geometry · Trigonometry

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