The London, Edinburgh and Dublin philosophical magazine and journal of science . leg, and also because the middle plate acts as a shield betweenit and the negative leg of the carbon. § 19. Experiment 17.—In order finally to demonstratethat the negative leg of the carbon loop was the chief activeagent iu this production of a current between the middleplate and the positive electrode, a lamp like No. 4 was takenhaving a metal middle plate between the legs, and this middleplate had attached to it a mica screen (see fig. 16) a little Fig. MIDDLE PLATS SHIELDED MIDDLE PLA TE EXPOSED larger tha
The London, Edinburgh and Dublin philosophical magazine and journal of science . leg, and also because the middle plate acts as a shield betweenit and the negative leg of the carbon. § 19. Experiment 17.—In order finally to demonstratethat the negative leg of the carbon loop was the chief activeagent iu this production of a current between the middleplate and the positive electrode, a lamp like No. 4 was takenhaving a metal middle plate between the legs, and this middleplate had attached to it a mica screen (see fig. 16) a little Fig. MIDDLE PLATS SHIELDED MIDDLE PLA TE EXPOSED larger than the plate, and so fixed by a loose rivet that itcould be shaken in front of the plate so as to shield one sideof it, or shaken on one side so as to fully expose the device was in fact a removable shield attached to one Edison Effect in Glow Lamps. 87 surface of the metal middle plate, and when placed up againstit it shielded one surface from, and when jerked on one sideit exposed that surface to, the carbon leg opposite to thatsurface. This lamp (called No. 5) was set on the circuit inthe first place so that the leg of the carbon horse-shoeopposite to the mica-shielded side of the middle plate wasthe positive leg. If the carbon was brought up to an incan-descence corresponding to about 3*5 or 4 watts per candle-power and the galvanometer connected between the positiveelectrode and the middle plate, then it wras found that theeffect on the galvanometer current which was produced bythe interposition or withdrawal of the
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