"Figure 11.—Geared Astrolabe by Muḥammad b. Abī Bakr of Isfahan, A.D. 1221-1222."--p. 98, of: On the Origin of Clockwork, Perpetual Motion Devices, and the Compass by Derek J. de Solla Price.Originally published by the Smithsonian Institution in 1959 as Contributions from The Museum of History and Technology, Paper 6, now available at Project Gutenberg.
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