The outlines of physics: an elementary text-book . Fig. 197. A silk thread attached to the middle of a light rod or strip, whichis fastened along the free end of the sheet of foil, serves as a drawing upon the silk thread carefully, the tin foil may be unrolledlike a window shade from its roller. When released it will be rolledup again by the action of the springs. Procedure : (a) Mount the proof plane above the plate of the electroscope, atthe distance of about five centimeters. Attach a fine wire to theproof plane, and carry the same to the foil, to the free end of which•it may be
The outlines of physics: an elementary text-book . Fig. 197. A silk thread attached to the middle of a light rod or strip, whichis fastened along the free end of the sheet of foil, serves as a drawing upon the silk thread carefully, the tin foil may be unrolledlike a window shade from its roller. When released it will be rolledup again by the action of the springs. Procedure : (a) Mount the proof plane above the plate of the electroscope, atthe distance of about five centimeters. Attach a fine wire to theproof plane, and carry the same to the foil, to the free end of which•it may be fastened by means of a bit oi gummed paper (Fig. 198). •. Fig. 198. (6) The foil being rolled up, electrify it gradually until the leavesof the electroscope show marked divergence. By means of the silkthread unroll the foil carefully and watch the gold leaves. As theouter suirface of the foil increases In area in the process of being 240 THE OUTLINES OF PHYSICS unrolled, the charge is compelled to distribute itself over greater andgreater areas, and it diminishes in density. This change is indicatedby the gradual coming together of the leaves of the up the foil again and note that this change was not due to lossof charge. The leaves will be seen to dilate nearly to their formerposition. Gold leaves, attached directly to the curtain, will indicatethe change in the density of charge in the same manner as the electro-scope. 214. Distribution of Charge upon the Surface of Conductors.— An insulated conductor, when charged, does not as-sume the same intensity of electrification at all pointsupon its surface unless it be spheric
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics
