Abstract
IN my first communication (vol. xi. p. 307) upon this subject, I stated that the actual temperature had apparently no effect upon the colour of the paper. Since then I have had reason to change my opinion. During the late severe weather I have had better opportunities of studying the behaviour during frost, and I have observed that though in summer the paper will remain red for a difference of 3° between the thermometers, in very cold weather it is only red when that difference falls to 0°, or perhaps 5°. This seems to agree with the fact that cold air cannot dissolve so much aqueous vapour as warm air.
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SMITH, A. “Chameleon Barometer”. Nature 11, 365 (1875). https://doi.org/10.1038/011365a0
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DOI: https://doi.org/10.1038/011365a0
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