Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 93
pon above. Warming the air of a room inwhich experiments are performed dries the air, by removingit further from its dew-point, while warming the apparatusabove the temperature of the air prevents the formation ofthe film of water on the insulating supports. Paper, beingvery hygroscopic, must be… … covered with commonly used for investigations in electricity is the Gold-leaf Electroscope. This consists of a brassrod (A) fastened to the centre of a brasscircular cap (JB), and having at its other endtwo strips of gold leaf (CC), which, whenthe instrument is unelectrified, hang downparallel to…
Electricity
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