The London, Edinburgh and Dublin philosophical magazine and journal of science . July 1896. H 98 Prof. J. A. Fleming on the to the metal plate, recourse was had to the lamp ~Ro. 3, withmetal (aluminium) cylinders embracing without touching thecarbon at two different places. These cylinders, as before, wewill call X and Y (see fig. 22). Cylinder X was the one nearthe base of the positive leg of the carbon, and cylinder Y wasthe one near the top of the negative leg. When the galvanometer was connected between the negativeelectrode of the lamp and the cylinder X surrounding thelower part of the p
The London, Edinburgh and Dublin philosophical magazine and journal of science . July 1896. H 98 Prof. J. A. Fleming on the to the metal plate, recourse was had to the lamp ~Ro. 3, withmetal (aluminium) cylinders embracing without touching thecarbon at two different places. These cylinders, as before, wewill call X and Y (see fig. 22). Cylinder X was the one nearthe base of the positive leg of the carbon, and cylinder Y wasthe one near the top of the negative leg. When the galvanometer was connected between the negativeelectrode of the lamp and the cylinder X surrounding thelower part of the positive leg, no perceptible current was foundto be passing when the carbon was rendered incandescent. Oninserting a single Clark cell in series with the galvanometer sothat the negative pole of the cell was in connexion with thecylinder X and the positive pole of the cell through the galvano-meter in connexion with the negative electrode of the lamp,hardly any perceptible current was found to be passing (seefig. 22). The Clark cell was then reversed, connecting the Fig. positive pole of the cell to the cylinder X and the negative polethrough the galvanometer to the negative electrode of thelamp. On bringing the lamp into action, a considerablecurrent of several milliamperes was found to be passing in sucha direction that a current of positive electricity was flowingacross the vacuous space from the metal cylinder to-the hotcarbon, or a negative current from the hot carbon to the coolermetal cylinder. On switching-offthe lamp, there was a curious- kick v or. throw of the galvanometer, indicating a suddenrusk of current in the same direction as the steady currentwhich the cell had been sending. These effects occurred alsowhen the cylinder Y was employed, and the galvanometer withor without the cell in series joined in between the negative Edison Effect in Glow Lamps. I 99 electrode of the lamp and the cylinder Y embracing the toppart of the negative leg of the carbon (see fi
Size: 2128px × 1175px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, bookidlondon, booksubjectscience
