Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 29
electrification is positive or negative, istermed an Electroscope. The feather which wasattracted or repelled, and the two pith balls which flewapart, as we. found in Lesson I., are in reality simpleelectroscopes. There are, however, a number of piecesof apparatus better adapted for this particular… … Fisr. 6. upon a sharp point. A thin strip of brass or wood, oreven a goose quill, balanced upon a sewing needle, will 12 ELEMENTARY LESSONS ON [chap. i. serve equally well. When an electrified body is held nearthe electroscope it is attracted and turned round, and willthusindicate the presence of…
Electricity · Magnetism
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