Abstract
THIS pamphlet describes some new experiments in conduction and radiation of heat. The author has prepared a series of grades of paper sensitised to heat by impragnating them with a “sympathetic ink” which turns green on heating (i.e. on drying). The tint attained in any experiment may be considered as depending routhly upon the amount of heat absorbed; thus the paper acts as a calorimeter rather than as a thermometer. This law would be true if the absorbed heat were all transformed into the latent heat of steam; since, however, the paper sensibly warms (and, therefore, radiates), the law is not so exact; though even so there is a time-temperature compensation. The double iodides sometimes employed for the purpose are thermoscopes rather than calorimeters, for their transition points are somewhat too high and when reached the transformation is rapid and automatic; that is, it is independent of the heat supply.
Heat Shadows.
By Walter Jamieson. Pp. viii + 30. (London: Blackie and Son, Ltd., 1907.) Price 6d. net.
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Heat Shadows . Nature 76, 149 (1907). https://doi.org/10.1038/076149a0
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DOI: https://doi.org/10.1038/076149a0