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Edward Troughton British, 1753-1836, circa 1795


Signed on the arc of the frame "Troughton London", the double brass "T" frame, formed with strips of brass in duplicate, and joined with turned brass pillars, the brass arc inset with a silver scale calibrated from 5 to 155 degrees, the index arm with clamp and tangent screws, magnifier, vernier scale, lignum vitae handle, two sets of colored filters and telescopic lens. Within the original shaped mahogany case with hinged lid and a label for "Observatory,/ Devenport," with date, calibration and owner information, and then "J. Combes/ Admiralty Agent, dec.".
Height 11.5". Width of arc 14". The box: Height 5". Length 12.5". Width 16.25".

  • Provenance:
    Sotheby's London, Frank Collection of Scientific Instruments, 1986.
    The Kelton Collection of Marine Art & Artifacts.

    Edward Troughton (1753-1836), was a founder member of the Royal Astronomical Society, and one of the most important makers and designers of instruments, and patented this form of sextant in 1788. This sextant, termed the Troughton type, was being made as late as 1830. This type of sextant is featured in Homer's painting '8 Bells'.
  • Exhibited:
    Pacific Asia Museum at U.S.C., Trade and Treasure Exhibition, 1987.

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The Marine Sale Session I
August 4, 2022 9:30 AM EDT
East Dennis, MA, US


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