Drawing instruments including John Farey's elliptograph for drawing ellipses and Sir Howard Douglas' reflecting protractor in the form of a sextant. Copperplate engraving by Wilson Lowry after a drawing by John Farey from Abraham Rees' Cyclopedia or Universal Dictionary of Arts, Sciences and Literature, Longman, Hurst, Rees, Orme and Brown, London, 1815.

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Photo credit: © Florilegius / Alamy / Afripics
License: Licensed
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