. The London, Edinburgh and Dublin philosophical magazine and journal of science . earth by a position of the cylinder is indicated by the dotted circleround c in the figure. The stem of the gas-burner, and thewires from the pieces of foil passed through holes in the sideof the cylinder without touching it. In the first regular experiments that were made therespective pairs of quadrants of the electrometer were joinedto the binding-screws of the condenser, one pair of quadrantsbeing as usual connected to earth. The condenser was thencharged ; 4 Leclanches sending the spot of light nea
. The London, Edinburgh and Dublin philosophical magazine and journal of science . earth by a position of the cylinder is indicated by the dotted circleround c in the figure. The stem of the gas-burner, and thewires from the pieces of foil passed through holes in the sideof the cylinder without touching it. In the first regular experiments that were made therespective pairs of quadrants of the electrometer were joinedto the binding-screws of the condenser, one pair of quadrantsbeing as usual connected to earth. The condenser was thencharged ; 4 Leclanches sending the spot of light near to theend of the scale. The flame being in action, the battery wasdisconnected and the scale-readings taken at equal intervalsof time until the spot of light was down to near the these readings the rate of leakage could be the range of potentials was very limited. For the later experiments, specimens of whose results aregiven below, an arrangement was suggested to me by C. Foster, , which is applicable to much widerranges of earth The figure gives a diagram of the connexions. Thebinding-sereiv B of the condenser was kept in connexionwith one electrode, Q, of the battery ; the other electrode, P,with the earth and with one pair of quadrants ; whilst theother binding-screw, A, of the condenser was connected tothe insulated pair of quadrants during the whole of each setof observations. Before beginning a set of readings, the two pairs ofquadrants of the electrometer were put into connexion with as Conductors of Electricity. 299 one another and with P ; this charged the condenser. Sincethe quadrants were connected, the spot of light stood initiallyat zero. The two pairs of quadrants were then disconnectedfrom each other, and discharge by the flame showed itself onthe electrometer-scale by a motion of the spot of light oatover the scale from the zero. Each set of readings had of course to be concluded whenthe light moved off the
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Keywords: ., bookcentury1800, bookdecade1840, bookidlondon, booksubjectscience
