488 



SUBMAKINE CABLE LAYING AND KEPAIEING. 



the absorption discharge in terms of the hlides is found by- 

 direct proportion — 



p=lj^— divisions of slides. 



The correction p is the slide reading equivalent to the absorp- 

 tion discharge and must be subtracted from the slide reading 

 a in the formula if the deflection produced by the slides d-^ is- 

 opposite in direction to the absorption discharge d or added 

 to it if in the same direction. 



The formula with correction added therefore becomes 



Capacity of cable (F) =f( IM^ _ A. 



A plug or switch should be connected in the battery circuit 

 in the above tests, so that current can be put on or taken off 

 the slides as required. 



Saunder's Key for Gott's Capacity Test. 



Dr. Muirhead states that if the absorption discharge is not 

 measured at once, before the oozing out of the charge absorbed 

 by the dielectrics begins, it will slowly change and a wrong 

 value be obtained — in other words, that the earthing period, or 

 time interval between the moment of earthing the condenser 

 and the moment of reading the absorption discharge, should be 

 nil, or as small as possible. 



Dr. Muirhead's article in The Electrician, above referred to^ 

 should be consulted for a further study of the subject. 



Saunder's Key for Gott's Test.— Mr. H. [A. C. Saunders, 

 late Electrician-in-Chief of the Eastern and Associated Tele- 



