108 



Potts — Rowland 's JS 7 eio Method. 









Table X. 

























L = 



5-318 



, etc. R 2 



R 3 



R4 



Ra 



r 



R'> 



A 



T 



A 



"t 



709-0 



2556-8 



203-62 



35"7 



3 4811 



56-46 



20-73 



0919 



225-8 



R a 



R ; , 



T 



A 



Corrected for 

 electric absorption. 

 R„ R/, 



L 



1()6 x 



R„Rr 



=C, C 



Ci 



~l-Vcl 



429-2 



1589-1 



•160 



36-2 



429-2 



16053 



7-719 





7-719 



429-3 



1628-1 



•0654 



14-8 



429-3 



1642-9 



7-540 





7-540 



429-3 



1640-0 



•0389 



8-8 



429-3 



1648-8 



7-513 





7-512 



429-4 



1651-0 



•0151 



3-4 



429-4 



1654-4 



7-487 





7-480 



429-4 



1628-0 



•0601 



13-8 



429-4 



1641-8 



7-543 





7-543 



8 

 7-7 



5 

 4 



3 - 

 7-5 



2 ■ 



1 " 



•02 



C.ticisn% represent friofi ',» ii»»Jt 

 OrJiifites represent c«/j tfei fy ,'« M-K 



04 



•06 



•08 



•10 



•14 



■16 



with the theory. The condenser has a capacity which shows a 

 slight variation with the period of the current. The capacity 

 increases with increase in the period of the current, as shown 

 by the theory ; and in amount it is somewhat less than as the 

 square of the period. 



II. Detection of Short Circuits. 



A very useful application of the Wheatstone bridge is its 

 use for the detection of short circuits in coils of wire. If a 

 mass of metal or a closed coil of wire is held near a coil of 

 wire carrying an alternating current, there will be induced in 

 it certain currents. Hence there must be more energ}' supplied 

 to the primary circuit to keep up the current. This extra 



