1. 
   gear wheel
   (from the article `gear`) machine component consisting of a toothed wheel attached to a rotating shaft. Gears operate in pairs to transmit and modify rotary motion and torque ... ...a mechanical contact, actuated by the balance motion, to provide properly timed electric-drive pulses. Each oscillatio...
   Found op http://www.britannica.com/eb/a-z/g/15
   
   

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