Hints to Travellers, Scientific and General, Vol. 2

by Royal Geographical Society

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Thermometers are either direct-reading or self-registering. The former are used for obtaining the temperature at any given moment, the latter for ascertaining the highest or the lowest temperature in a certain interval of time. They are filled either with mercury, or a light fluid which freezes less readily, such as alcohol or creosote.

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Hints to Travellers, Scientific and General, Vol. 2

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