res. Take a retort flask AS in fig. 55. At B there is anaperture through which a thermometer passing through atightly fitting cork can be inserted. A is connected by means 140 HEAT. [CH. IX of a glass tube C and india-rubber tubing to an air-pump. Awater suction pump which will work continuously is… … Fig. 55. through it and has its open end immersed in a vessel ofmercury, thus forming a pressure gauge. This tube must belonger than the height of the barometer and should have ascale attached. Heat the water in the flask AB by a Bunsen burner andstart the pump. The pressure of the air above the…
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