1) Gas technology 2) Pulsometer
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https://www.crosswordclues.com/clue/vacuum-pump
A vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum.
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http://en.wikipedia.org/wiki/Glossary_of_fuel_cell_terms
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 according to three techniques: Positive displacement pumps...
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http://en.wikipedia.org/wiki/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, compress it, and discharge the gas at at...
Found on
http://www.britannica.com/eb/a-z/v/1
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 pressures, the additional use of a mercury vacuum...
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http://www.probertencyclopaedia.com/browse/GV.HTM
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