76 



Prof. J. A. Fleming on the 



which the middle plate was placed between the carbon legs or 

 in the form of a cylinder embracing the carbon. 



The current obtained at any definite working voltage was 

 considerably greater when the leg of the carbon nearest the 

 plate was the positive leg than when it was the negative leg. 



Fig. 9. 



A series of observations were taken using the lamp at dif- 

 ferent voltages and measuring with the Elliott galvanometer 

 the potential-difference between the platinum plate and positive 

 electrode of the lamp, and these results were as tabulated 

 below in Table No. 10. 



Table No. 10. Lamp No. 2. Elliott Galvanometer. 



Table showing the potential-difference between the platinum 

 plate and the positive electrode of the lamp at various 

 working voltages. Positive leg of carbon nearest the 

 platinum plate. 



Working Watts per 

 volts of the ; candle- 

 lamp, power. 



Volts 

 between 

 platinum 

 plate and 

 positive 

 electrode. 



Working 



volts of the 



lamp. 



Watts per 

 candle- 

 power. 



Volts 

 between 

 platinum 

 plate and 

 positive 

 electrode. 



43 

 44 

 45 

 46 

 47 



6-26 

 5-80 

 4-42 

 4-10 



3-80 



•088 

 •111 

 •144 

 •156 

 •172 



48. 

 49 

 50 

 51 



3-55 

 3-32 

 3-12 

 2-94 



•199 

 •236 

 •289 

 •352 



