Wright, Mark R., 1854- · London : Longmans · leaf 48
is thus continuously takenfrom the water in a, its temperature falls,and it ultimately freezes. If the outside of the bulb, a, beobserved, it will be found that it is sooncovered with a film of moisture, due tothe aqueous vapour in the air condens-ing. If a thermometer were inside thebulb A, we… … Fig. 27. 40 Heat the temperature of a falls the moisture upon its surface freezes,and it becomes covered with snow. Hygfrometers.—A hygrometer is an instrument for deter-mining the dew-point. Daniells hygrometer is a cryophorus containing ether andits vapour ; a delicate thermometer is fixed in one…
Physics
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