File:Natural Hygroscope Figure 2.jpg

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English: "Fig. 2 shows the indications of the pelargonium hygroscope, as compared with a Mason hygrometer of fine construction."
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Source Facts Worth Knowing Selected Mainly from the Scientific American for Household, Workshop, and Farm Embracing Practical and Useful Information for Every Branch of Industry.
Author Sloane, T. O'Conor

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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

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