John Arnold, London, Invt. Et Fecit, Movement No. 43/344, 54 Mm, 119 G, Circa 1783 John Roger Arnold, London, Inv.T Et Fecit, Mo

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John Arnold, London, Invt. Et Fecit, Movement No. 43/344, 54 Mm, 119 G, Circa 1783 John Roger Arnold, London, Inv.T Et Fecit, Mo

139 John Roger Arnold, London, Inv.t et Fecit, Movement No. 2045, Case No. 2045, 58 mm, 187 g, circa 1808 An English pocket chronometer with spring detent escapement Case: silver, case maker’s punch mark “FT” (Frederick Thoms), London hallmark for 1891. Dial: enamel. Movm.: full plate movement, Arnold’s spring detent escapement, Z balance with 2 weights and 2 screws, blued helical balance spring, very finely engraved balance cock. Chronometers made by John Arnold and his son John Roger Arnold were valued very highly and usually in use for decades. The watch at hand is an excellent example of this; the movement was fitted into a new, tailor-made case made by Frederick Thoms, who was most likely the most famous casemaker in his time. On the same occasion, the movement was updated with a new dial and a new set of hands. John Roger Arnold Inv.t et Fect — ，倫敦，英國懷錶時計，附發條衝擊式天文台擒縱 52200 C: 2, 22 D: 2, 22, 32, 33 M: 2, 41, 51 6.500 - 8.500 EUR 7.700 - 10.000 USD 58.500 - 76.500 HKD 140 John Arnold, London, Invt. et Fecit, Movement No. 43/344, 54 mm, 119 g, circa 1783 A pocket chronometer - “OF THE SECOND QUALITY” - of historical interest with spring detent escapement and original mahogany box Case: silver, dedication engraving, case maker’s punch mark “WW”. Dial: enamel. Movm.: full plate movement, Arnold’s spring detent escapement, OZ balance, helical gold balance spring, very finely engraved pierced balance cock. The engraving on the silver case next to the compulsory hallmark and the date stamp of 1783 states that “This chronometer travelled around the world with captain James Cook and was presented to the honourable Mr. Alexander Lean, secretary of the Hudson’s Bay Company, by the company in 1816.” Cook’s third and last voyage, however, lasted from 1776 to 1779 and the case of this chronometer was clearly not made until seven years later; taking these facts into consideration in connection with several technical details of the chronometer – such as the spring detent escapement, the OZ balance and the cylindrical gold balance spring, which Arnold only started using around 1779 – it is probable that the case was created at a later date; it is very unlikely that the case would have been engraved with a dedication that was deliberately untruthful. It is certain that the case and the dial were made around 1783. John Arnold Invt. et Fecit — - “OF THE 倫敦生動歷史背景的懷錶時計 SECOND QUALITY” 次優品質，附發條衝擊式天文台擒縱及桃花心木原盒 52199 C: 2 D: 2, 4, 33 M: 2, 41, 51 14.000 - 20.000 EUR 16.400 - 23.400 USD 126.000 - 180.000 HKD.

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Articles Articles ALEXI BAKER “Precision,” “Perfection,” and the Reality of British Scientific Instruments on the Move During the 18th Century Résumé Abstract On représente souvent les instruments scientifiques Early modern British “scientific” instruments, including du 18e siècle, y compris les chronomètres de précision, precision timekeepers, are often represented as static, comme des objets statiques, à l’état neuf et complets en pristine, and self-contained in 18th-century depictions eux-mêmes dans les descriptions des débuts de l’époque and in many modern museum displays. In reality, they moderne et dans de nombreuses expositions muséales were almost constantly in physical flux. Movement and d’aujourd’hui. En réalité, ces instruments se trouvaient changing and challenging environmental conditions presque constamment soumis à des courants physiques. frequently impaired their usage and maintenance, Le mouvement et les conditions environnementales especially at sea and on expeditions of “science” and difficiles et changeantes perturbaient souvent leur exploration. As a result, individuals’ experiences with utilisation et leur entretien, en particulier en mer et mending and adapting instruments greatly defined the lors d’expéditions scientifiques et d’exploration. Ce culture of technology and its use as well as later efforts sont donc les expériences individuelles de réparation at standardization. et d’adaptation des instruments qui ont grandement contribué à définir la culture de la technologie. In 1769, the astronomer John Bradley finally the calculation of the distance between the Earth reached the Lizard peninsula in Cornwall and the Sun. Bradley had not needed to travel with his men, instruments, and portable tent as far as many of his Transit counterparts, but observatory after a stressful journey.
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Hordern House Rare Books Pty
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“Precision,” “Perfection,” and the Reality of British Scientific Instruments on the Move During the 18Th Century Alexi Baker
Document generated on 09/29/2021 11:28 a.m. Material Culture Review “Precision,” “Perfection,” and the Reality of British Scientific Instruments on the Move During the 18th Century Alexi Baker Volume 74-75, 2012 Article abstract Early modern British “scientific” instruments, including precision timekeepers, URI: https://id.erudit.org/iderudit/mcr74_75art01 are often represented as static, pristine, and self-contained in 18th-century depictions and in many modern museum displays. In reality, they were almost See table of contents constantly in physical flux. Movement and changing and challenging environmental conditions frequently impaired their usage and maintenance, especially at sea and on expeditions of “science” and exploration. As a result, Publisher(s) individuals’ experiences with mending and adapting instruments greatly defined the culture of technology and its use as well as later efforts at standardization. National Museums of Canada ISSN 0316-1854 (print) 0000-0000 (digital) Explore this journal Cite this article Baker, A. (2012). “Precision,” “Perfection,” and the Reality of British Scientific Instruments on the Move During the 18th Century. Material Culture Review, 74-75, 14–29. All rights reserved © National Museums of Canada, 2011 This document is protected by copyright law. Use of the services of Érudit (including reproduction) is subject to its terms and conditions, which can be viewed online. https://apropos.erudit.org/en/users/policy-on-use/ This article is disseminated and preserved by Érudit. Érudit is a non-profit inter-university consortium of the Université de Montréal, Université Laval, and the Université du Québec à Montréal. Its mission is to promote and disseminate research.
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