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圖錄編號
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407
圖錄編號 407
初步估價 2,500 - 5,000 €
This is a lot of a former auction!

E.J. Dent, London

, Movement No. 6513, 54 mm, 160 g, circa 1844

A remarkable and rare pocket chronometer, used to determine the longitude of the most western point of Ireland


Case: smooth, consular case. Dial: enamel. Movm.: full plate movement, chain/fusee, spring detent escapement, large chronometer screw balance, freesprung, helical hairspring.

The determination of the Longitude of the island of Valentia, Ireland in the year 1844
G. B. Airy decided that he would like to estimate this longitude using a variety of pocket chronometers. Some of these chronometers were the property of the Government, but most of them were lent by their owners, Mr. C. Sheepshanks, Mr.R. Molyneux, Mr. Dent, Mr. Parkinson & Frodsham and Mr. C. Frodsham. The Dent Pocket Chronometers Nos. 5876, 6513 and 6514 were used from June to August 1844. The results of these investigations were published in 1846 by G.B. Airy entitled "Determination of the Longitude of Valentia in Ireland by Transmission of Chronometers". A series of comparisons were made between Greenwich & Liverpool, Kingston & Liverpool, Greenwich & Kingston and Kingston & Valentia.
Lit.: Vaudrey Mercer "Edward John Dent", page 218
#42099
錶殼 非常好, 不是原廠,有追加整理
錶盤 非常好, 多處極細的裂紋
机蕊 非常好, 走動正常


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