54 Prof. J. A. Fleming on the 



sponding to about 3*5 watts per candle-power. When a 

 mil amperemeter having a resistance of 6372 ohms was joined 

 between the base P of the positive leg of the carbon (see fig. 4) 

 and the middle plate M_, a current was found passing through 

 the galvanometer from the terminal P to the plate M. This 



Fig. 3. 



Fig. 4. 



current had a magnitude of about 3 milliamperes when the 

 carbon was in the normal state of incandescence. 



If the milamperemeter was connected between the negative 

 electrode of the lamp and the middle plate, no current per- 

 ceptible by this galvanometer was found. On replacing the 



