THE LOCALISATION OF BREAKS AND FAULTS. 



387 



Mr. H. W. Sullivan provides with his galvanometer a shunt 

 with vernier sub-divisions as in the Kelvin slides, but with 43 

 coils only as against 201 in the latter-mentioned type. This is 

 shown in diagrammatic form in Fig. 230. The sub-division 



.10 Mt fj- 



8D" c.iV. 



Fig. 230.— Sullivan's Universal Shunt. 



are in steps of xoroo*^ V^^^ of ^^^ whole. Four scales and 

 sliders are provided : — 



Scale 1 containing 11 coils of 1,000 ohms each. 



„ 2 „ 11 „ 200 



„ 3 „ 11 „ 40 



„ 4 „ 10 „ 8 



The^^slider on scale 3 embraces two coils on that scale, value 

 80 ohms, and the whole of scale 4, value also 80 ohms. These 

 beingiin parallel, the actual resistance between the contacts of 

 the slider on scale 3 is 40 ohms, namely the resistance of one 

 coil only, although it embraces two. Consequently, the actual 

 resistance of scale 3 is 10x40 = 400 ohms. 



GC2 



