PP:IRCE. — BATTERIES IN MULTIPLE ARC. 199 



If the cells are all alike, and if r = b, this ratio has the value 

 1 -i- n, aud the arrangement in jiarallel is n times as efficient as the 

 arrangement in series. In the case of unlike cells, if the currents in 

 the cells are all positive, ^^ is always less than i^. It is easy, how- 

 ever, to find cases where -^ is less than F^, for this is true when 



2(C^.^,)<[2(C,)7.2(6,). 

 Cambridge, July, 1894. 



