322 



REPOKT 1 886. 



Table I. — Comparison of Amounts of Silver and Copper Deposits.. 



Mean 



3^4010. 



It -will be seen that the extreme divergence of the values from the mean amounts 

 to rather less than ^ per cent. ; the errors are irregular, but the difficulty of keeping 

 the current constant was very great, and in some cases there was considerable 

 difference, so that no inferences as to the effect of current density could be drawn. 

 The arrangement was therefore altered and five copper cells containing respectively 

 1, 2 4, 8, and 16 wires, were all included in the same circuit with one silver cell. 

 The electromotive force was obtained from 12 storage cells, or from Grove cells. 

 The observations are included in the first part of Table II. There was still some 

 difficulty in keeping the current constant, and the apparatus was in consequence 

 transferred to Emmanuel College, where a dynamo working at 110 volts for electric 

 lighting was available ; a satisfactory series of observations was obtained, shown 

 in the latter part of Table II. 



Table II. — Hafio of Weight of Silver to Weight of Copper. 



Date 



Oct. 10 



20 



26 



I. At the Cavendish LABonATOET. 



Remarks 



29 



Galvanometer de- 

 flexion variable. In 

 the 4-wire cell 3 

 wires only received 

 deposits. 



Galvanometer de- 

 flexion variable. In 

 the 4-wire cell 3 

 wires only received 

 deposits. 



Galvanometer de- 

 flexion variable. 

 ' One wire ' slight- 

 ly discoloured. 



