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Mémoires sur l'horlogerie exacte.
Paris, Bachelier, 1832.
Première édition sous forme de livre, très rare. Ces mémoires ont parus en danois dans les publications de la Société des sciences de Copenhague. - Remarques sur l'horlogerie exacte et proposition d'un échappement libre (à double roue) avec une réduction considérable de frottement. - Description de l'échappement libre à double roue. - De l'isochronisme des vibrations du pendule et proposition suivant laquelle on peut facilement faire vibrer le pendule des horloges astronomiques dans des arcs d'égale étendue. - Description d'un pendule compensateur... - De l'influence de l'air sur le régulateur des pendules astronomiques et des horloges à longitudes. - Description d'un nouveau thermomètre métallique à minimum. Illustré par 5 belles planches dépliantes. Ces mémoires sont publiés et traduits par le fils de l'auteur Louis-Urbain Jürgensen. Le célèbre horloger danois Urban Bruun Jürgensen (1776 - 1830) était fils d'un horloger royal. Il entreprit à l'âge de 20 ans un voyage de cinq ans à l'étranger pour observer les avancées technique de l'horlogerie à Neuchâtel, Genève, Locle, Paris et Londres. Jürgensen reprit l'atelier de son père en 1811. Il a été élu en 1815 à l'Académie des sciences, un honneur inhabituel pour un artisan. L'entreprise Jurgensen existe encore aujourd'hui. Quelques rousseurs. Bon exemplaire. /// In-8 de 63 pp., 5 planches dépl. Demi-basane bleue. (Reliure moderne.) //// First edition in book form, quite scarce. These memoirs were published in Danish by the Copenhagen Society of Science. They are here published and translated by the author's son Louis-Urbain Jürgensen. "Louis Urban collected five of his father's written contributions in a booklet titled Mémoires sur lHorlogerie exacte. Being in French, it inevitably made the material accessible to many more, as compared to if it had been published in Danish. This work includes five plates and is quite scarce." (F. Plum, Urban Jürgensen and the Royal Danish Academy of Sciences and Letters). The famous Danish watchmaker Urban Bruun Jürgensen (1776 - 1830) was the son of a royal watchmaker. At the age of 20, he embarked on a five-year journey abroad, to see the technical developments of horology in Neuchâtel, Geneva, Locle, Paris and London. Jürgensen took over his father's workshop in 1811. In 1815, he was elected to the Academy of Sciences, an unusual honor for a craftsman. The Jurgensen company still exists today. Illustrated with 5 beautiful folding plates. Some foxing. A good copy.
Beskrivelse over et nyt Metal-Thermometer.
(København, 1823). 4to. Bound uncut in recent marbled paper covered boards. Published in ""Videnskabernes Selskabs Skrifter"". Fine and clean. (3), 284-288 pp. + 2 engraved plates.
First appearance of Jürgensen’s description of his metal-thermometer Jürgensen ”starts the article by applauding the mercury thermometer and calls it one of the most perfect instruments in the world of natural sciences. The metal thermometer is however, he states, much more portable and rugged than the former. This new design included an arrangement that allows the user to observe the lowest temperature since the last resetting of the hand. Moreover, the metal thermometer is more dependable in conditions where the temperature is well below nil degrees, as the mercury may freeze in such an environment. The thermometer described in this article is of a slightly larger size than the first iteration and thus meant as a stationary tool for better readability. Jürgensen goes on to describe the construction of the thermometer, using two illustrations – one of the front and one of the back of the device.” (Insight: Urban Jürgensen and the Royal Danish Academy of Sciences and Letters).
