68 



Prof. J. A. 



Fleming on th 



Table No. 5. Lamp No. 3. Milamperemeter . 



Table showing the potential-differences between the positive 

 electrode of the lamp and the two cylinders X and Y 

 respectively, and the corresponding currents through the 

 galvanometer. 



Working 



volts of the 



lamp. 



Yolts between 

 cylinder X and Ml1 



the positive cur u re 



electrode P of tne 



the lamp. mete 



Position (1). m S 



liampere 

 at through 

 galvano- 

 r connect- 

 X and P. 



Volts between 

 cylinder Y and 



the positive 



electrode P of 



the lamp. 



Position (3). 



Milliarnpere 



current flowing 



through the j 



galvanometer I 



connecting i 



Y and P. 



34 



•1 



015 



•1 



•015 



35 



•15 



023 









36 



•20 



031 



V 3 



•045 



37 







•4 



•060 



38 



" ; 6 



095* 



•7 



•11 



39 



•8 



126 



•9 



•14 



40 



1-05. 



166 



1-1 



•17 



41 



1-3 



206 



1-6 



•25 



42 



1-8 



285 



2-0 



•31 



43 



21 



333 



2-8 



•44 



44 



2-6 



412 



3-5 



•55 



45 



3-0 



476 



4-5 



•77 



46 



36 



571 



5-8 



•92 



47 



4-2 



659 



7-2 



1-12 



48 



49 



791 



8-8 



1-39 



49 



- 5-6 



889 



10-9 



1-72 



50 



6-2 



984 



13-6 



2-15 



51 







15-1 



2-39 



52 







18-6 



2-95 



§ 7. Experiment 4. — The magnitude of the current found 

 on connecting any galvanometer between one of the cylinders 

 and the positive electrode of the lamp was found to be de- 

 pendent to some degree on the perfection of the vacuum. 

 Lamp No. 3 when first made had not a very perfect vacuum. 

 A series of measurements was, however, made with it, and the 

 same repeated after re-exhaustion. The results are tabulated 

 together below. 



