Compasses
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“The compasses, next to the T square and triangles, are used more than any other instrument. A pencil and pen point are provided, either of which may be inserted into a socket in one leg of the instrument, for the drawing of circles in pencil or ink.” — Hallock, 1905
Source
V. I. Hallock I.C.S. Refrence Library (Scranton: International Textbook Company, 1905)
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