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Air-Pump
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Description: "This was invented in 1865 by H. Sprengel. The instrument, in its original (simplest) form, consists of a vertical capillary glass tube a of about 1 mm. bore, provided with a lateral branch b near its upper end, which latter, by an india-rubber join governable by a screw-clamp, communicates with a funnel. The lower end is bent into the shape of a hook, and dips into a pneumatic trough. The vessel to be exhausted is attached to b, and, in order to extract its gas contents, a properly regulated stream of mercury is allowed to fall through the vertical tube." —The Encyclopedia Britannica, 1903
Source: The Encyclopedia Britannica, New Warner Edition (New York: The Werner Company, 1893)XVI:31
Keywords: Air, Pump, Air-Pump, Sprengel, Capillary, Glass, Tube, Mercury,
Copyright: 2009, Florida Center for Instructional Technology. See license.
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