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Catalogue |
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![]() Triangulation Instrument Underneath the baseline arm is a scale of 12 inches 'EIN SCHVCH', the first inch, marked 'ZOLL', is undivided, subsequent inches are divided to 2, 3, 4, etc parts to 12, numbered by 1. Signed: 'Iost B[ubar]rgi F' and engraved with the name of an owner 'Alberto Marchoni' Underneath the arm on the fixed pivot are three gunnery scales, 'STEIN', 1 to 60 decreasing, divided to 5, subdivided to 1, numbered by 5; 'GOSSEN EISEN', 1 to 125, similarly divided; and 'BLEI', 1 to 125 decreasing, similarly divided. A short fourth scale is partly covered by a brass end piece. See: B. Bramer, Bericht zu M. Jobsten Burgi seligen geometrischen triangular Instruments (Kassel, 1648) and J. Bennett and S. Johnston, The Geometry of War 1500-1750 (Oxford, 1996). Jim Bennett |