Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 132
swith the outer coat connected with the earth.The jar is discharged only by connecting theinner and outer coat, and the discharge pro-duces an intense spark or shock. It is usedwhere accumulations of large quantities ofelectricity are required for mechanical orother effects. It may be remembered… … Fig. 75. 83. Voltas Condensing Electroscope.—On the sameprinciple depends the condensing electroscope of Volta. Thecap of the electroscope is ground perfectly plane, and anotherplane disc of brass with a glass handle is made to fit accuratelyon to it. The two are then separated by a thin layer of…
Electricity
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