Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 89
ind repulsion between the two rods. If, on the otherhand, we bring towards it an excited glass rod, we shall find A Fig. 45. attraction. If instead we take an excited glass rod, andsuspend it in a paper stirrup, or poise it on a point by means 7o Electricity. [Book II. of a dimple blown in its… … Fig. 46. one developed in glass when excited by silk, called Vitreousor Positive electricity (written + E.); another developed insealing-wax when excited by flannel, which is calledEesinous or Negative electricity (written — K). The experi-ments also show that like electricities repel, but…
Electricity
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