flasktightly. Invert it so that thewater may cover the cork, as infig. 54, and wait till the boilingceases. The space above the wateris filled with water vapour at afairly high temperature, and thewater is subject to the pressureof this vapour. Allow some dropsof cold water to fall from a spongeon… … Fig. 54. from water boiling under various pressures. 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.…
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