. Physical laboratory experiments : mechanics, optics and heat. =^ t^-jzC, where t^ is the temperature in centigradedegrees and C is a constant. He derives the following valuesfor these constants for the following typical liquids:— a b log a C Water — —1 +20° Alcohol — —1 +20° Benzene — —1 +24° Apparatus.—The arrangement of the apparatus is as follows:An open manometer A is connected through a large air reser-voir B, and a return condenser C, with the boiling apparatus D. This consists ofa horizontal brasscylinder in the a
. Physical laboratory experiments : mechanics, optics and heat. =^ t^-jzC, where t^ is the temperature in centigradedegrees and C is a constant. He derives the following valuesfor these constants for the following typical liquids:— a b log a C Water — —1 +20° Alcohol — —1 +20° Benzene — —1 +24° Apparatus.—The arrangement of the apparatus is as follows:An open manometer A is connected through a large air reser-voir B, and a return condenser C, with the boiling apparatus D. This consists ofa horizontal brasscylinder in the axisof which is sealeda small brass tubeclosed at one endfor containing thethermometer forregistering the tem-perature of theboiler. The pressure inthe apparatus maybe varied by con-necting the reservoir B with a suction or a pressure pumpthrough the bottle F. This is inserted as a trap to preventwater from the water pump from sucking back into the appara-tus, and to collect, when the cock E is opened, any water whichmay have condensed in X^X Fig 8. 40 NOTES ON PHYSICAL LABORATORY EXPERIMENTS The boiler is filled with water through a thistle tube gaugeattached at one end; the height of water in the boiler is indicatedby the position of the water in this gauge which is of burner is constructed so as to distribute a series of smallflames along the length of the boiler. Procedure. — The following directions apply particularly towater, which is the liquid used in this experiment:— First. Connect B to the suction-pump through the safetybottle F and exhaust until the pressure within the apparatus isreduced to about 50-60 mm. Close E and the second stop-cockbetween F and the pump. Then, and not before, turn off thewater. See that the apparatus is air-tight (indicated by a con-stant reading of the manometer), before proceeding further. Ifit is not, speak to an instructor. Second. See that the waste-cock from the condenser is openbefore turning on the
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Keywords: ., bookcentury1900, bookde, booksubjectmechanics, booksubjectphysics
