Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 98
Fig. 52. crystals which have the facets at the opposite ends of thecrystal differently arranged (Fig. 52). The specimen shouldbe suspended in a stirrup of fine wire over a metal platewarmed by a spirit lamp. Very soon one end will showpositive, and the opposite negative, electricity, and this…
Electricity
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