348 



Prof. A. Schuster and Mr. A. W. Oossley. [Jan. 21, 



experiment represent the order in which they were made. We begin 

 by comparing together the deposits obtained in bowls of different 

 sizes, both being in air. 



With the exception of the last three observations, the results give 

 a consistent difference of about two parts in ten thousand in favour of 

 the larger bowl. With respect to the last three observations, we have 

 to offer the following explanation : In order to trace, if possible, the 

 difference between the results obtained with large and small bowls, 

 we used in these experiments two anodes of the same size, while in all 

 other cases the anodes were approximately proportional to the size of 

 the bowl. Experiment 12 is anomalous ; we cannot account for the 

 difference of 3 milligrams in favour of the small bowl, and simply 

 record the observation ; but do not think that this one experiment 

 can render the results of the others doubtful, especially when taken 

 in conjunction with Lord Rayleigh's observations, presently to be re- 

 ferred to. Experiments 13 and 14 seem to show that when anodes 

 of the same size are used the discrepancy between the bowls dis- 

 appears. This confirms an impression we have gained that the 

 effect is possibly due to secondary products formed at the anode 

 when the current density there exceeds a certain value. It seems 

 certain that too great a current density at the anode is accompanied 

 by a smaller deposit, but our experiments are not sufficient to decide 

 whether the systematic difference in the two bowls is to be ascribed 

 to the same cause. 



Table II. Comparison of Deposits obtained by Lord Rayleigh in 

 Large and Small Bowls. 



