Electricity for public schools and colleges . ELECTRICITY CH. leaves ; and trte^e strips should be in metallic connection with the earth, orwith the table upon which the instrument stands. The glass of the vessel Bshould be dry, and the upper part may be coated with shellac-varnish. The reasons for these details of constructionwill be understood later on. Test for electrification. — We shallalso understand by what follows laterthat the only certain test for electrifi-cation is the divergence of the the leaves be charged and be di-vergent, it is found that the approachof a neutra
Electricity for public schools and colleges . ELECTRICITY CH. leaves ; and trte^e strips should be in metallic connection with the earth, orwith the table upon which the instrument stands. The glass of the vessel Bshould be dry, and the upper part may be coated with shellac-varnish. The reasons for these details of constructionwill be understood later on. Test for electrification. — We shallalso understand by what follows laterthat the only certain test for electrifi-cation is the divergence of the the leaves be charged and be di-vergent, it is found that the approachof a neutral (or unexcited) body to theknob C will cause a greater or lessconvergence of the leaves. Hence, ifin any case we obtain such convergenceof the leaves by the approach of a body,we should compare the amount of thisconvergence with that produced by theapproach of the same, or a similar bodywhen unexcited. It is only if theformer convergence is markedly greater in amount than the latter that wecan say that it indicated electrical excitement in the body approached
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Keywords: ., bookcentury1800, bookdecade1890, bookpubl, booksubjectelectricity
