Janety Marc Etienne
Contenu
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Nom
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Janety Marc Etienne
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Date de naissance
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1739
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Date de mort
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1820
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Lieu de naissance
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Bonnieux (Vaucluse)
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Lieu de mort
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Paris
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Couverture temporelle
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2/2 18th century/1/4 19th century
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Biographie
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Janety1 was admitted to the Paris Goldsmiths' corporation 26 July 1777 having been apprenticed to Vincent réant to whose business Janeti succeeded the following year. By 1786 he had mastered the arsenic process for purifying platinum and making it malleable. In the following years he produced a rrange of jewellery, snuff-boxes, watch-chains, coffer-pots, sigar-basins and the like in it, &and also crucibles and other utensils for laborartory use. He also tried to sell the purified metal of which, by 1789, he found that he had too great a stock.
With the Revolution Janety was drawn into Fourcroy's work on the separation of tin from copper in cast bells so that the copper could be used to produce cannon. For this he established a bell-metal purification plant at Marseille,. In 1790, Lavoisier, to illustrate his paper 'Observations sur la platine' showed a vase and a coffee-pot of Janety's making to the Académie des Sciences, while in the same year Janety described his method to the Bureau de Consultation.2 This account formed the basis of the report made by C. L. Berthollet and Bertand Pelletier to the Académie in 1792,3 which recommended state suport for Janety's work.4
In 1793 Janety added the making of clock parts to his enterprise in Marseille, but from here he was summoned to Paris at the beginning of year IV [last quarter 1795] to cast metres and kilogrammes in platinum. By the beginning of year X [1801] he had completed 4 kilogrammes, one of which had been returned to him by Fortin for corrrection, and four standard metres.5 A pioneer in the use of all kinds of objects in platinum, he displayed a selection of small pieces, jewels and chemical apparatus at the 1802 exhibition.6
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Notes biographiques
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1 Janety's name was variouslt spelt as Janetty, Janetti, Geanty, Jeanty, Jeanetty, and Gianetti. the form used here is that which he can be shown to have used on at least two occasions. See McDonald & Hunt 78.
2 This report is published in full in Cadet iii 633-36. Lavoisier's paper was poublished in the Annales de Chimie, v 1790, 137-41.
3 It was published in the Annales de Chimie, xiv 1792, 20-33.
4 McDonald & Huntt 78-84 whence most of the details here given derive.
5 All four of the metres have survived, one in the Archives Nationales, one in the Musée du Conservatoire des Arts et Métiers, one at the Observatoire de Paris and one in the collections of the Ecole des Ponts et Chaussées. Wolf (poids) 68-9.
6 Costaz 1819, 168. The complete dossier concernning a recompense for Janetti Arch CNAM D327 & D429 is reprinted in de PLace (Bureau).
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Adresse ; enseigne ; période ; source
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Marseille
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r de l'Arbre Sec Paris
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Exposition année ; ville ; type ; récompense
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1802 Paris Industrie Nationale
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Identifiant
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2414
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ark:/18469/1q8bb