1. 
   vacuum pump
   (from the article `Hauksbee, Francis, The Elder`) ...a fellow of the Royal Society in 1705, he contributed numerous papers to the society`s Philosophical Transactions, including an account of a ... Vacuum pumps are simply compressors that take in gas at a pressure lower than atmospheric pressure, co...
   Found op http://www.britannica.com/eb/a-z/v/1
   
   
2. 
   Vacuum pump
   A vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. The first vacuum pump was invented in 1650 by Otto von Guericke, and was preceded by the suction pump, which dates to antiquity. == Types == Pumps can be broadly categorized accordin...
   Found op http://en.wikipedia.org/wiki/Vacuum_pump
   
   
3. 
   Vacuum Pump
   A vacuum pump is a device for removing air from laboratory apparatus. The pump may be required because the materials to be handled are air-sensitive or because a low pressure is needed--for example, in vacuum distillation. A reliable vacuum can be obtained using a motor-driven oil pump. For very low...
   Found op http://www.probertencyclopaedia.com/browse/GV.HTM
   
   

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