The outlines of physics: an elementary text-book . Fig. 127. Fro. 128. barometers) and to pressure gauges. The stiffness of themoving part is adapted in each case to the pressures whichit is intended to indicate. Figures 127 and 128 show the essential features of twowell-known forms. PROPEBTIES OF GASES 145 130. ExPEKiMENT 34. — Measurement of the Vacuum produced bya Mechanical Air Pump, and Determination of the Rate of Leakage ofthe Pump and Receiver. Apparatua: (1) An air pump with open neck receiver. (2) A wooden scale divided to centimeters; a watch or other time-piece. (3) A barometer.

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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics