Protractor
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“The outer edge is a semicircle, with center at 0, and is divided into 360 parts. Each division is one-half of one degree, and, for convenience, the degrees are numbered from 0 to 180 from both A and B.” — Hallock, 1905
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ProtractorsSource
V. I. Hallock I.C.S. Refrence Library (Scranton: International Textbook Company, 1905)
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