FAREY, JOHN, JNR. |
England, fl.1791-1851, MIM NIM |
Ellipsograph = Christie-SK 2/2/77 = RSM; Sextant = RSM. |
invented a perspective machine in 1807; invented an ellipsograph in 1810; ellipsograph signed "Invented and Made by John Farey, Jnr"; suggested inverting the slide on the Soho slide rules in 1827. |
Westminster, London. |
NMM 1; G.L'E. Turner 24; Delehar 9; RSW. |
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