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BAROMETRIC LIGHT

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Originally appearing in Volume V03, Page 421 of the 1911 Encyclopedia Britannica.
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BAROMETRIC See also:

LIGHT , the luminous glow emitted by See also:mercury in a See also:barometer See also:tube when shaken. It was first observed by See also:Jean See also:Picard, and formed the subject of many experiments at the hands of See also:Francis Hawksbee. The latter showed that the Torricellian vacuum was not essential to the phenomenon, for the same glow was apparent when mercury was shaken with See also:air only partially rarefied. The glow is an effect of the See also:electricity generated by the See also:friction of the mercury and the air in the barometer tube.

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