Electricity for public schools and colleges . its surface in succession, the charges so obtained to an electroscope, we can show thatthe end C opposite to the - charged A B is strongly -f charged. Thechargejs feebler as we approach the centre of the cylinder ; about the centrethere will be a region where no charge is to be detected ; while, as we approach 54 ELECTRICITY CH. rv. the end D, we find a stronger and stronger — charge. The proof-plane mustbe discharged in a Bunsens flame between each two trials. Note.—When the charge has been conveyed to the gold-leaf electroscopeby t
Electricity for public schools and colleges . its surface in succession, the charges so obtained to an electroscope, we can show thatthe end C opposite to the - charged A B is strongly -f charged. Thechargejs feebler as we approach the centre of the cylinder ; about the centrethere will be a region where no charge is to be detected ; while, as we approach 54 ELECTRICITY CH. rv. the end D, we find a stronger and stronger — charge. The proof-plane mustbe discharged in a Bunsens flame between each two trials. Note.—When the charge has been conveyed to the gold-leaf electroscopeby the proof-plane, its strength can be roughly seen by observing the amountof divergence of the leaves, while its sign can be recognised by the approachof an excited ebonite rod. (ii.) While the conductor C D is in the presence of the charged body AB,let us touch C D at any point. This will connect it with, and so make it formpart of, the earth. We shall find that all the repelled — electricity goes to earth, leavingthe body charged Fig. ii. We should have expected this, since the portions of the earth near A Bwould probably, judging from experiment (i.), be -fly charged, while the —would go as far away from AB as possible. But still it seems at first a little surprising that the — charge shouldescape as readily if we touch the end Cas if we touch the end D. This will beexplained in Chapter V. § 6 [d). Herewe may only say that the presence ofthe + at the end C renders it as easyfor the — to pass to earth by theroute near A B as by the other route. (iii.) The divided cylinders.—W^emay construct our cylinder of twohalves separately we allow the whole, when forming one cylinder, to be acted upon induc-tively as in fig. i., and then separate the two halves, we shall find the halfnearer AB to be -fly charged, the half further from A B to be — ly charged.(iv.) Charging the gold-leaf electroscope by induction.—The second experi-
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