Chatelain Henri
Contenu
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Nom
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Chatelain Henri
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Couverture temporelle
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2/2 19th century
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Biographie
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Manufactured the circular slide rules in watch-form, or combined with watches (the calculigraphe), devised and patented by A. E. M. Boucher between 1873 and 1878.1
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Notes biographiques
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1 Hopp 65-6.
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Bibliographie
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Cercle à caluls (Calculigraphe H. C.) système Boucher perfectionné, n. d. n. p. [probably Paris c. 1878]
Calculating Circle Calculigraphe H C Boucher's System with Improvements, n. d. n. p. [probably Paris c. 1878]
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Adresse ; enseigne ; période ; source
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Paris
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Identifiant
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1155
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ark:/18469/1r658