Keywords: Leonardo Gyroscopes.png en Gyroscope study by Leonardo da Vinci He asked which one will spin for longer Paris Ms A Folio 20 dated 1492 Presented in Feldhaus Franz Maria Leonardo der Techniker und Erfinder 1922 p 80 PD-old-100 Creator Leonardo da Vinci 1492 Credit line http //en wikipedia org/wiki/User/Portolanero Wikimedia Commons CC-BY-3 0 CC-BY-3 0 Technical drawings by Leonardo da Vinci Inventions and constructions by Leonardo da Vinci Mechanical engineering by Leonardo da Vinci Mirror writings by Leonardo da Vinci |