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 F
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 Fig. 129. Procedure: (a) Bend a piece of glass tubing, about 120 cm. long and 0-5 diameter, so as to form a manometer of the form shown inFig. 124. Fit the short arm to the neck of the receiver with a goodcork or rubber stopper. Mount the receiver, with its manometer 146 THE OUTLINES OF PHYSICS tube, upon the plate of the air pump. Bring a flat dish of mercuryfrom below, raising it until the open lower end of the manometer is?well submerged and supporting it in position with blocks. , Set upthe scale vertically with its edge touching the tube, the lower endof the scale submerged in the mercury of the cistern (Fig. 129). TO cm.~ < Le aka ye cf \ A arr pi imp \ \ \, V \, u q: \ N, 111 ?\ X V Bo cm. \ N. X ^N \ X Tit HE 100 s. 200 s. Fig. 130. (b) Take fifty strokes with the pump, timing them to about two-second intervals. Ten seconds after the last stroke read the positionof the mercuiy in manometer column. Immediately thereafter^notethe height to which the mercury in th
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
