THE LOCALISATION OF BREAKS AND FAULTS. 



371 



The variable range milammeter, as now manufactured by 

 Messrs. Johnson & Phillips to these suggestions, is shown in 

 Fig. 219, and the internal connections in Fig. 220. The shunts 



^50 MA 



G 7-66 MA 



-f^ 



"~&^^SP 



-150 MA 



fl 



Switch 



Fig. 219.— The Milammeter. 



Sj and Sg for the different ranges of sensitiveness are wound 

 with copper and phosphor bronze in proportion to the winding 

 on the moving coil and the controlling springs, so that the 



Common 

 Terminal 



A 



G 

 Range 



50 "/a 150 °Va 

 Range Range 



a s_ 



Fig. 220. — Internal Connections of Milammeter. "^ ' 



indications are unaffected by temperature variation. A common 

 bar connects one side of the coil and the shunts to the positive 

 terminal of the instrument. The other end of the coil may be 

 connected by means of the switch to either shunt or direct 



sb2 



