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| Keywords: Leonardo Magnetic Inclination.png en Measurement of magnetic inclination by Leonardo da Vinci Paris Ms A folio 20 dated 1492 The upper word is Magnet the lower Weight In another sketch on the same folio we see two such boards separated in the landscape The needles points towards the North Star at the right After Leonardo the first notice of the inclination was 1542 by Georg Hartmann on a horizontal needle First builder of a Leonardo like needle with a horizontal axle was Robert Norman in 1580 Presented in Feldhaus Franz Maria Leonardo der Techniker und Erfinder 1922 p 119 PD-old-100 Leonardo da Vinci 1492 en User Portolanero CC-BY-3 0 Manuscripts by Leonardo da Vinci Technical drawings by Leonardo da Vinci Inventions and constructions by Leonardo da Vinci Mechanical engineering by Leonardo da Vinci | ||||
