Chronometer-Accuracy: Verification of the Longitude of Paris

Catalogue no: 1468
Dewey No: Subject(s): Courtenay Ilbert Archive
Author(s): Unknown
Total pages: 12 Illustrations: 0 Language(s): English Publication date: June, 1838
Editor: Publisher: The Nautical Magazine
Dimensions: 220mm x 140mm Condition: Reasonable but cover fragile and torn
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An extract from The Nautical Magazine, published under separate covers.

The pamphlet (possibly written by Arnold and Dent) describes an experiment carried out by Messrs. Arnold and Dent.  "The proposition was to select two meridians, the difference of longitude between which was considered to be accurately obtained, and then by transporting the chronometers from one of these meridians to the other, to ascertain the difference of longitude given by them, and compare it with the difference previously received as correct."

Twelve chronometers were used for this experiment, put into the care of the Astronomer-Royal (G.B.Airy) in Greenwich and sent to Paris to be received by M. Arago, Astronomer-royal of France.

Description of the journey gives much interesting details of the different modes of transport in the period immediately prior to the railways, also of the difficulties encountered, eg. "...they were exposed to a severe concussion by the rude mode of examination adopted by a customs-agent, who had not been advised of the permission for their importation into Paris without examination;"

Small errors on the known longitude were discovered.

Room location: Library Extension Cabinet: F Shelf: 5
Search terms: Chronometers
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