Reprint of papers on electrostatics and magnetism . mencing with no electricity except a feeble charge in one ofthe jars, only discoverable by a delicate electrometer, to see in 322 Ehdroplioric Apparatus, [xxiii. the course of a few minutes a somewhat rapid succession ofsparks pass in some part of the apparatus, or to see the dropsof water scattered about over the lips of one or both thereceivers. 403. The Leyden jars represented in the sketch (fig. 2) areopen-mouthed jars of ordinary flint glass, which, when very dry,I generally find to insulate electricity with wonderful insi
Reprint of papers on electrostatics and magnetism . mencing with no electricity except a feeble charge in one ofthe jars, only discoverable by a delicate electrometer, to see in 322 Ehdroplioric Apparatus, [xxiii. the course of a few minutes a somewhat rapid succession ofsparks pass in some part of the apparatus, or to see the dropsof water scattered about over the lips of one or both thereceivers. 403. The Leyden jars represented in the sketch (fig. 2) areopen-mouthed jars of ordinary flint glass, which, when very dry,I generally find to insulate electricity with wonderful inside coatings consist of strong liquid sulphuric acid, andheavy lead tripods with vertical stems projecting upwards abovethe level of the acid, which, by arms projecting horizontallyabove the lip of the jar, bear the inductors and receivers, asshown in fig. 2. Lids of gutta percha or sheet metal close themouth of each jar, except a small air-space of from -|^ to -^^ ofan inch round the projecting stems. If a tube (fig. 3) be added Fig. SA Sulphuric Acid. to the lid to prevent currents of air from circulating into theinterior of the jar, the insulation may be so good that the lossmay be no more than one per cent, of the whole charge in threeor four days. Two such jars may be kept permanently chargedfrom year to year by very slow water-dropping arrangements,a drop from each nozzle once every two or three minutes beingquite sufficient. 404. The mathematical theory of the action, appended below*is particularly simple, but nevertheless curiously interesting. J * Let c, c be the capacities of the two jars, I, V their rates of loss per unit .XXIII.] and Illustrations of Voltaic Tluory. 323 405. The reciprocal electrostatic arrangement now describedpresents an interesting analogy to the self-sustaining electro-magnetic system recently brought before the Eoyal Society byMr. C. W. Siemens and Professor Wheatstoue, and mathemati-cally investigated by Professor Clerk Maxwell. Indeed it w
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmagnetism, bookyear18
