This is apparently the sole surviving example of Arnold & Dent’s c.1830 trade card, featuring information on their award of £3,000 from the Board of Longitude, and an unusually detailed text that reprints a letter from the Astronomer Royal commending the firm’s No.114 chronometer and giving the results of a ‘Public Trial’. The report ends “This is superior to any yet tried by Order of The Lords of the Admiralty.”
The dates of the trial are 1828 and 1829,
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