Marine chronometer by John Arnold and Son, 1787-1799

Made:
1787-1799
maker:
John Arnold and Son

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Science Museum Group Collection
© The Board of Trustees of the Science Museum, London

Science Museum Group Collection
© The Board of Trustees of the Science Museum, London

Science Museum Group Collection
© The Board of Trustees of the Science Museum, London

Two-day marine chronometer (No 63) by John Arnold and Son, Cornhill, London, 1787-1799.

Finding longitude at sea had long been a concern for navigators. Chronometers, first devised by John Harrison in the mid-1700s, kept a record of time at the Royal Observatory, Greenwich. When navigators compared this with local time at sea, determined from observations of the Sun or stars, they were able to find their longitude. John Arnold was one of Britain’s leading makers of chronometers at the end of the 1700s.

Details

Category:
Time Measurement
Object Number:
1879-31 Pt1
Materials:
brass (copper, zinc alloy), glass, steel (metal) and wood (unidentified)
Measurements:
overall (in case, as displayed): 85 mm x 162 mm x 162 mm, 1.813 kg
type:
instrument component
taxonomy:
  • component - object
  • furnishing and equipment
  • measuring device - instrument
  • timepiece
credit:
On loan from Charles Frodsham & Co. Ltd, London.