File:Reprint of papers on electrostatics and magnetism (1872) (14796915603).jpg

Identifier: reprintofpaperso00kelv (find matches)
Title: Reprint of papers on electrostatics and magnetism
Year: 1872 (1870s)
Authors: Kelvin, William Thomson, Baron, 1824-1907
Subjects: Electricity Magnetism
Publisher: London, Macmillan
Contributing Library: Boston College Libraries
Digitizing Sponsor: Boston Library Consortium Member Libraries

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the moving body; next,by substituting for two half rings four quadrants, and conse-quently for an electrified body projecting on one side only ofthe axis, an electrified body projecting symmetrically on thetwo sides, and moveable round an axis ; and lastly, by variousmechanical improvements, and by the addition of a simplegauge to test the electrification of the moveable body, and ofa replenisher to raise this electrification to any desired degree. 346. In the accompanying drawings, Plate I. fig. 1 repre-sents the front elevation of the instrument, of which the chiefbulk consists of a jar of white glass (flint) supported on threelegs by a brass mounting, cemented round the outside of itsmouth, which is closed by a plate of stout sheet-brass, with * A sino-le gold leaf hanging between the upper ends of two equal andsimilar dry piles standing vertically on a horizontal plate of metal, one withits positive and the other with its negative pole up. t Accademia Pontificia dei Nuovi Lincei.
Text Appearing After Image:
XX.) On EledrometeTS and Electrostatic Measurements. 263 a lantern-shaped cover standing over a wide aperture in itscentre. For brevity, in what follows these three parts will becalled the jar, the main cover, and the lantern. Fig. 5 represents the quadrants as seen from above; theyare shown in elevation at a and h, fig. 1, and in section at c andd, fig. 2. They consist of four quarters of a flat circular boxof brass, with circular apertures in the centres of its top andbottom. Their position in the instrument is shown in figs.1, 2, and 6. Each of the four quadrants is supported on aglass stem passing downwards through a slot in the main coverof the jar, from a brass mounting on the outside of it, andadmits of being drawn outwards for a space of about 1 centi-metre (f of an inch) from the positions they occupy when theinstrument is in use, which are approximately those shown inthe drawings. Three of them are secured in their proper posi-tions by nuts (e, e, e) on the outside of the ch

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