Muhammad ibn Abi Bakr al Ibari century) Astrolabe with geared calendar, Oxford, Museum of the History of Science. Of Persian origin, and one of the oldest complete devices of it's like in the museums collection.
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Train your entire body and boost your metabolism with this high-intensity workout for women. This circuit helps you build a healthier heart and kicks your body's repair cycle into high gear, helping you burn more calories during and up to 24 hours after t
Epicyclic Wall Clock 3 This clock is an original design that uses an epicyclic (planetary) gear train. The gears are aircraft quality birch plywood from Finland and the frame is made of jatoba (sometimes called Brazilian cherry).