versine


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Related to versine: Haversine, coversine

versine

[′vər‚sīn]
(mathematics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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A (triangle-type instruments) Special function 1, 2 described in the treatise B Chord arm on circle 3 C (wire instruments) Sine, chord, and tangent 5, 6 D (square-type instruments) Tangent 7, 8 E Sine and versine 10, 11 F (improved Ptolemy's Chord 9, 4 parallactic instrument) G Pinhole device 12 Some of the instruments allegedly designed by Ghazan Khan show a great similarity with instruments constructed in Europe in the following centuries.
This instrument consists of two copper rules of equal length, where the thicker and wider, vertical sine rule has a hole and on which is attached the smaller, horizontal versine rule (or sahm, lit.