Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 180
ne footof the dividers at I, and extend the other to e: and to take offthe distance 2.58, we place one foot of the dividers at p and ex-tend the other to q. Remark I. If a line is so long that the whole of it cannotbe taken from the scale, it must be divided, and the parts of ittaken from the scale… … A O 16. if, with any radius, as AC, we describe the quadrant CD,and then divide it into 90 equal parts, each part is called adegree. Through C, and each point of division, let a chord be drawn,and let the lengths of these chords be accurately laid off on ascale: such a scale is called a scale of…
Geometry · Plane trigonometry
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