The London, Edinburgh and Dublin philosophical magazine and journal of science . a is a charged wirein the axis of the cylindricalvessel b. The walls of bcould be lined with any de-sired material by inserting acylinder cc composed of could be done by re-moving the glass plate d atthe end, which was cementedon. The vessel could beexhausted through the stop-cock / if desired. e wasa drying - bulb containingphosphoric anhydride. Thewire a passed air-tightthrough the brass cap g,cemented on to the neck hof b ; h was made of lead-glass, on account of thesuperior insulating qualitiesof this
The London, Edinburgh and Dublin philosophical magazine and journal of science . a is a charged wirein the axis of the cylindricalvessel b. The walls of bcould be lined with any de-sired material by inserting acylinder cc composed of could be done by re-moving the glass plate d atthe end, which was cementedon. The vessel could beexhausted through the stop-cock / if desired. e wasa drying - bulb containingphosphoric anhydride. Thewire a passed air-tightthrough the brass cap g,cemented on to the neck hof b ; h was made of lead-glass, on account of thesuperior insulating qualitiesof this kind of glass. Thecap g carried a brass stripk carrying a gold leaf whole was surroundedby a vessel m as shown, nwas an iron wire attached toa platinum wire o. This ironwire could be brought intocontact with h by means ofan external magnet in orderto charge the system. mcould be exhausted throughthe stopcock p, and driedby means of the phosphoricanhydride contained in <).The position of the gold leaf was read by a microscope withmicrometer eyepiece focussed upon 682 Hon. R. J. Strutt on Radioactivity Before making an experiment the insulation, which is allimportant, was tested, m was permanently exhausted, andthe stopcock p closed, b was also exhausted, for the time,and a charge given to the brass strip k, so that the leaf /diverged. An interval of one hour was allowed in order thatany absorption of the charge by the glass insulation h shouldhave time to take place. After that it was found thatthere was no measurable movement of the leaf over the scale-divisions in two or three hours; i of a division would havebeen visible. When the vacuum test of insulation had been made, dryair was admitted into the vessel b. It was assumed that theglass insulation, which was satisfactory in a vacuum, re-mained so when air which had been dried by passagethrough phosphoric anhydride was admitted in contact withit. As soon as the air was admitted into b, a leakage ofelectricity fr
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Keywords: ., bookcentury1800, bookdecade1840, bookidlondon, booksubjectscience
