Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 28
dby a light needle of glassor sealing-wax balancedhorizontally on a verticalpivot, or a goose-quillbalanced on the point ofa sewing-needle, makes aconvenient electroscope. The gold leaf electro-scope is represented inFig. 129. A metallic rod, which passes through the corkof a glass vessel,… … Fig. 129. 198 FRICTIONAL BLECTRIClTY. coated with a solution of sealing-wax or shellac in alcohol,to lessen the deposition of moisture from the atmosphere.This instrument may be made by the pupil and, whenwell made, is yery dehcate. {a,) The electric pendulum is used as an electroscope as follows…
Electricity · Magnetism
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