The London, Edinburgh and Dublin philosophical magazine and journal of science . usual incandescence by a continuous current of the properstrength, and a suitable sensitive galvanometer is connectedbetween the insulated metal plate and the positive terminal ofthe lamp, it will in general be found to indicate a current ofsome milliamperes flowing through it. The direction of thiscurrent is from the positive electrode of the lamp throughthe galvanometer to the insulated metal plate, or wire. Whenthe same galvanometer is connected between the negative poleof the lamp and the middle plate, unless
The London, Edinburgh and Dublin philosophical magazine and journal of science . usual incandescence by a continuous current of the properstrength, and a suitable sensitive galvanometer is connectedbetween the insulated metal plate and the positive terminal ofthe lamp, it will in general be found to indicate a current ofsome milliamperes flowing through it. The direction of thiscurrent is from the positive electrode of the lamp throughthe galvanometer to the insulated metal plate, or wire. Whenthe same galvanometer is connected between the negative poleof the lamp and the middle plate, unless it is very sensitive, itindicates no current. This effect was very carefully examined * Communicated by the Physical Society : read March 27th, 1896. On the Edison Effect in Glow Lamps. 53 by Mr. W. H. Preece in 1885, and he subjected it to asystematic examination by the aid of a number of lampshaving such metal plates placed in various positions *. Bythis observer a number of very interesting facts were col-lected, the result of which was to point out the general natureof th
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Keywords: ., bookcentury1800, bookdecade1840, bookidlondon, booksubjectscience
