Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 113
cap and leaves of the electroscope, and although thisinstrument is not adapted to give numerical measures, we canspeak of a higher and lower potential according as the diverg-ence of the leaves is greater or less. When the leaves divergewith negative electricity we have negative potential, whichmay… … Fig. 60. of a small insulated sphere or proof-plane, and introduce themthrough the aperture, on touching the inner surface the chargeis given up to the sphere, and the proof-plane can be with-drawn uncharged. We now observe that the potential shownby the divergence in the gold leaves goes on rising…
Electricity
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