Signature |
Maker |
Instruments |
Comments |
Location |
References |
LEVI BEN GERSON |
Spain; France, 1288-1344, |
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astronomer and mathematician; invented the Jacob or cross-staff, the transvesal scale for subdividing angles and the camera obscura; author. |
Catalonia; Bagnols; Perpignan. |
B. Goldstein 1, 2, 3 and 4; DSB; Daumas 1; Michel 2; A.J. Turner 10. |
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