File:Sprengel vacuum pump.png

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English: Drawing of a Sprengel mercury vacuum pump, invented in 1865 by German chemist Hermann Sprengel. It was capable of evacuating containers to 10-6 atmosphere. It was used by William Crookes to investigate cathode rays, by William Ramsay to isolate the noble gases, and was the key technology that enabled Joseph Swan and Thomas Edison to invent the incandescent light bulb. It consisted of a container of mercury (A) allowed by a valve (C) to fall one drop at a time into a long glass tube (XD) which empties into a reservoir (H). Air is trapped between the drops in the tube and carried by the weight of the mercury out the bottom of the tube. This slowly evacuates the container (R) attached at the top.
Date before 1881
date QS:P,+1881-00-00T00:00:00Z/7,P1326,+1881-00-00T00:00:00Z/9
Source Downloaded August 13, 2013 from Augustin Privat Deschanel 1881 Elementary Treatise on Natural Philosophy, Part 1: Mechanics, Hydrostatics, and Pneumatics, D. Appleton and Co., New York, translated and edited by J. D. Everett, p. 197, fig. 146A on Google Books
Author Augustin Privat Deschanel

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