Vertheidigung Der Hahnschen Rechnungs Maschine Gegen Einige Misverstandnisse Welche Man Zum

by Philipp Matthaus Hahn

$4,950 · Offered by Jonathan A. Hill Bookseller

8vo, cont. speckled boards, some foxing. Weimar: 1785 . Dated 1 October 1784, this is one of only two accounts in print by Hahn — the first appeared earlier in the decade in the same journal — of his famous cylindrical calculating machines; they were the first fully functional and well-known four-species mechanical calculating machines. In this article, Hahn accuses Johann Helfrich Müller 1746-1830 , of stealing his designs in order to manufacture

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