Washing Out a Radiometer

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“Configuration used to wash out a radiometer using oxygen. A, bulb containing perchlorate of potash; B, charcol; C, radiometer; D, outlet; E, used for examing the gas given off.” —The Encyclopedia Britannica 1910

Source

Encyclopaedia Britannica (11th ed., vol. 16) (New York, NY: The Encyclopaedia Britannica Company, 1910)

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