172 Currents in the Branches of a Wheatstone's Bridge. 



Fig. 6. — Showing the actual variation of the quantities used from when 

 the iron cores are all withdrawn until two of them are entirely in. 



-o-- 



Scale *75 cui. = 20 volts. '75 cm. = 1 ampere. 



arrows as the cores are introduced, until the point P arrives 

 at P' when the cores are entirely in. The points H, C, M, 

 and D move to W 9 Q f , M', and t>' when the iron cores are 

 inserted into one pair of coils. 



