American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 50
w. Degree.—The 360th part of a circle ; it isno definite quantity, or distance, for everycircle, whatever its diameter may be, is sup-posed to be divided into 360 equal parts. Angle—Is the number of degrees containedbetween any two radii of a circle. The anglebetween any two lines is the same,… … arc or angle lacks of being 90° ; thus, if anangle or arc is 60°, its complement is 30°. To construct or draw a right angle, as inFig. 1, or raise a perpen-dicular to the line A B,set your compass in theline B, and with an open-ing greater than half theline, describe the twoarcs, G F and S J;…
Clocks and watches
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