Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 133
lates. It is only useful in cases wherea large quantity of electricity is available, but of too lowpotential to be sensible to the ordinary electroscope. Connectthe upper or condensing plate with the source of electricity, andthe cap with the earth by touching it with the finger. There H ii4… … Fig. 76. on lifting the cap becomes free, causing the leaves of the electro-scope to diverge with electricity of opposite kind to that of thesource. We shall illustrate the use of this apparatus hereafter. *84. Discharge by Alternate Contacts.—Returningto the two plates in given position (Art. 81),…
Electricity
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