Abstract
A PIECE of filter paper soaked in a strong solution of cobaltous chloride (CoCl2) is blue when dry, and red when moist; and I have found it very sensitive to slight changes in the quantity of moisture in the atmosphere, being more delicate than the thermometers I used.
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SMITH, A. On the Value of the so-called Chameleon Barometer as an Hygrometer. Nature 11, 307 (1875). https://doi.org/10.1038/011307a0
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DOI: https://doi.org/10.1038/011307a0
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