Astronomical instruments: Tobias Mayer's reflecting circle of 1752 and Jean-Charles Borda's improved version of 1777. Copperplate engraving by Wilson Lowry after a drawing by J. Farey from Abraham Rees' Cyclopedia or Universal Dictionary of Arts, Sciences and Literature, Longman, Hurst, Rees, Orme and Brown, London, 1820.

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Keywords: 19th, abraham, arts, astronomical, astronomy, borda, century, circle, copperplate, cyclopedia, dictionary, drawing, engraving, equipment, illustration, instrument, jean-charles, literature, mayer, rees, reflecting, sciences, tobias, universal