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D'OCAGNE, M. Maurice. Le calcul simplifie par les procedes mecaniques et graphiques...conferences faites au conservatoire national des arts et metiers, les 26 fevrier, 5 et 19 mars 1893.

Paris. Gauthier-villars et fils, Imprimeurs-Libraires.., 1894. First edition.
8vo. 118pp. With half-title, two folding charts to rear, and numerous vignette engravings to text. Contemporary cloth-backed marbled boards. Slightly rubbed to extremities, label removed from spine with consequent marking and loss of marbled paper to boards. Deaccessioned from the Geneva University Library, with occasional (cancelled) stamps, the odd pencilled marking and manuscript shelf-marks to blank-fly at front. From the library of Erwin Tomash, with his book-label to FEP.
Philbert Maurice d'Ocagne (1862-1938), French mathematician and engineer, the founder of the field of nomography; the graphical computation of algebraic equations.

Le calcul simplifie is one of the earliest attempts to classify calculating machines by type, divided into mechanical, logarithmic and graphical. Complete with illustrations, Ocagne's survey includes 'several one off-machines...such as the automatic multiplying machine of Leon Bollee (which used a mechanical form of Napier's bones) and the machine designed by Chebyshev' (Tomash and Williams II, p. 949).
Tomash and Williams O15.
£ 750.00 Antiquates Ref: 22553