Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 95
ilarly, if a rod of sealing-wax (Fig. 51) be fur-nished with a flannel cap extending three inches down it (witha silk thread attached by which it can be drawn off), bytwisting the rod round and round inside the cap electricity isgenerated; but on presenting them together to the electro-scope, no… … Fig. 51. This shows that tlie two electricities are always separatedtogether, and since, while the two bodies are held in contact,there is no trace of electrification, the two quantities sepa-rated are always such as just to neutralise each others attrac-tive and repulsive effect on external…
Electricity
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