List of chronometers on HMS Beagle
Chronometer makers
Some details of the chronometer makers referred to in the lists below are given in this table. With few exceptions, they were London-based makers.

List of chronometers on HMS Beagle

Section Title: Chronometer makers
Table Section Text: Some details of the chronometer makers referred to in the lists below are given in this table. With few exceptions, they were London-based makers.

Maker	Details

Arnold	John Arnold (1736–1799) was the leading chronometer maker of his time. He opened his business in The Strand in 1763, and later went into partnership with his son, John Roger Arnold (1769–1843), forming the company Arnold & Son.

Arnold & Dent	This was the successor company to Arnold & Son and was formed by a partnership between John Roger Arnold and Edward John Dent.

Dent	Edward John Dent (1790–1853). After the end of the partnership with Arnold, Dent formed a business which was continued by his stepsons.

Earnshaw	Thomas Earnshaw (1749–1829). An important figure in the history of chronometers, Earnshaw invented the spring detent escapement which later became the standard arrangement for all chronometers.

Eiffe	John Sweetman Eiffe (d.1880). Until his death, Eiffe held a grudge against the Admiralty for their failure to give him a reward for his invention of an auxiliary temperature compensation, which was independently discovered and patented by Molyneux while the Admiralty was still examining Eiffe's version.

French	Santiago James Moore French, or sometimes just James Moore French, was active from 1808 to 1842. He was a London chronometer maker operating at the Royal Exchange, later at Cornhill.

Frodsham	Charles Frodsham (1810–1871) was a clockmaker and chronometer maker with premises initially in Finsbury Pavement and then New Bond Street. He purchased the business of John Roger Arnold on Arnold's death in 1843 and was then based at the premises of Arnold's business in The Strand under the name of Arnold & Frodsham.

Gardner	Robert Gardner (d. 1875) was a Glasgow supplier who founded the business of Gardner and McGregor in 1834.

McCabe	McCabe was a London clock and watchmaker active from 1780 to 1811. He was born in Ireland but moved to London in 1775.

Molyneux	Robert Molyneux (d.1876) was a clock and watchmaker with premises in Southampton Row. The partnership R.

Morrice	D. & W. Morrice, chronometer, clock and watchmakers, 80 Cornhill, London.

Murray	James Murray (1780–1847) was a Scottish clock, watch and chronometer maker with a business at the Royal Exchange from 1815 to 1847.

Parkinson & Frodsham	William Parkinson and William James Frodsham (1778–1850) formed a London business in 1801. Frodsham came from a long line of watchmakers.

Pennington	Robert Pennington (1780–1844) was a chronometer maker from Camberwell. Robert Pennington & Son was a partnership between Pennington and his son John that existed between 1832 and 1842.

Sentence(s)

Thomas Earnshaw was one of chronometers on Beagle.

final_sentence: Thomas Earnshaw was one of chronometers on Beagle.