. The London, Edinburgh and Dublin philosophical magazine and journal of science . placed in an atmo- * Communicated by Lord Kelvin, having been read before the RoyalSociety of Edinburgh, May 1, 1899. Phd. Mag. S. 5. Vol. Ko. 290. July 1899. H 98 Dr. J. C. Beattie on the Leakage of Electricity from sphere whose temperature was gradually raised from thetemperature of the room up to 250° C. or 300° C. In thispaper only those experiments will be described where apotential-difference of between 80 and 240 volts was used. § 2. Apparatus.—The potential-difference was measured bymeans of a Kelvi
. The London, Edinburgh and Dublin philosophical magazine and journal of science . placed in an atmo- * Communicated by Lord Kelvin, having been read before the RoyalSociety of Edinburgh, May 1, 1899. Phd. Mag. S. 5. Vol. Ko. 290. July 1899. H 98 Dr. J. C. Beattie on the Leakage of Electricity from sphere whose temperature was gradually raised from thetemperature of the room up to 250° C. or 300° C. In thispaper only those experiments will be described where apotential-difference of between 80 and 240 volts was used. § 2. Apparatus.—The potential-difference was measured bymeans of a Kelvin multicellular voltmeter (laboratory pattern).The insulated terminal of this instrument was connected bya copper wire to the insulated terminal of an air-leyden, A(fig. 1). This air-leyden consisted of an outside metal box34 cms. long, 9 cms. broad, 6 cms. deep : one end of this wasopen; from the other and closed end a sheet of metal MM, ofthe same breadth as the box, passed along the middle of thebox for about three quarters of its length and divided the Fijr. 1. o Case. space inside into two equal parts. Into each of these spacesa metal plate P, 13 cms. long, 6 cms. broad, was put, insu-lated from the box, and kept in position by a stout wire, w,which was held by a wooden clamp, C, this latter being fixedin a block of paraffin. These two metal plates met near theopen end of the box. The stout wire formed the insulatedterminal of the air-leyden. The box, A, was covered on theoutside by asbestos ; round the asbestos one or more layersof wire gauze were wrapt. The whole was then supportedon two blocks of wood, W, W, and underneath it a stronggas-flame could be applied. The wire joining the insulatedterminal of the air-leyden to that of the electrometer wassurrounded by a metal guard-screen, S. The box was made insuch a way as to render impossible the passage of fumes fromthe gas-flame underneath into its interior. Charged Bodies at Moderate Temperatures. 99 § 3. Testing o
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