•400 



Dr. W. L. Robb on Oscillations 



3. Effect of varying the Electromotive Force. 



In order to determine the effect of varying the electromo- 

 tive force of the battery used in charging upon the variations 

 in the charge, two sets of observations were made. In one 

 set the battery used consisted of five accumulators joined in 

 multiple arc. In the second set the battery consisted of fifteen 

 accumulators joined in multiple arc in groups of five, and the 

 resultant groups joined in series ; in all other respects the 

 conditions under which the two sets of observations were made 

 were identical. Tables VI. and VII. give the results of these 

 observations. 



Table VI. (See also diagram 4.) 

 Mica Condenser. 





E = 2-075 volts. 



E=6 225 volts. 





Normal charge = 2' 075 



Is ormal charge = 6*225 





microcoulombs. 



microcoulombs. 



Observation 









number. 



Charge of 



Deviation 



Charge of 



Deviation 





Condenser. 



from the 



Condenser. 



from the 





Micro- 



normal 



Micro- 



normal 





coulombs. 



charge. 



coulombs. 



charge. 



1 



2-135 



+0060 



6210 



-0015 



2 



2400 



+0-025 



6240 



+0015 



3 



2053 



-0022 



6400 



+0-175 



4 



2057 



-0018 



6-482 



+0-257 



5 



2075 



+0000 



6-453 



+0228 



6 



2057 



-0018 



6-352 



+0-127 



7 



2049 



-0-026 



6 181 



-0 044 



8 



2058 



-0017 



6-487 



+0-262 



9 



2051 



-0 024 



6148 



-0-077 



10 



2-094 



+0019 



6-605 



+0-380 



11 



2102 



+ 0-027 



6-148 



-0-077 



12 



2058 



-0017 



6-643 



+0-418 



13 



2094 



+0019 



6170 



-0 055 



14 



2-103 



+0028 



6170 



-0 055 



15 



2007 



-0068 



6-222 



-0003 



16 



2053 



-0-022 



6-281 



+0 056 



17 



2136 



+0061 



6153 



-0072 



18 



2035 



-0040 



6-562 



+0337 



19 



2061 



-0014 



6-409 



+0-184 



20 



2016 



-0059 



6-152 



-0073 



