Berthélemy A
Contenu
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Nom
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Berthélemy A
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Couverture temporelle
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2/2 19th century
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Biographie
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A maker of surveying instruments who produced at least one patented design.1 He was succeeded by Ponthus & Therode (qv) in 1895, although a surveyor's circle is signed by Lepetit (qv) as his successor.2 A level patented by him, usually fitted with a Sanguet diastimomètre, was used by the Commission Général de Nivellement Général de la France.3 He patented a tacheometric protractor,4 and Durand-Claye's modified form of the Chézy level was developed by Berthélemy.5
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Notes biographiques
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1 Christie's SK 29.12. 90 lot 183 (a level with tangent screw, tripod stamped 44259) and 30. 5. 96 lot 155 (patent level).
2 Surveyor's level Randier 25. 7 98 lot 79; IFIP, 204. circle Randier 22. 7. 2000 lot 133. Lepetit absorbed the Ponthus business in 1900.
3 An example is preserved in the Musée des Arts & Métiers, Paris (Cat H. 87-9). Another was Sotheby's London 21. 9. 2000, ex Kellman collection, ex Christie's 27 September 1997, lot 70. Cf. Bonham's 21.4. 10 lot 103.
4 Tesseract 69 no 26.
5 d'Ocagne 36. Several of the instruments illustrated by d'Ocagne carry Barthélemy's name.
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Adresse ; enseigne ; période ; source
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16, rue Dauphine Paris
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Identifiant
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1021
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ark:/18469/1r2tk