THE TRANSFORMER. 



197 



Figure 161 shows a small transformer mounted on a pole, 

 taking current from street mains (upper wires in the figure) at 

 I , i oo volts, and delivering current to house mains (lower wires 

 in the figure) at 1 10 volts. The two small cases attached to the 

 upper cross-arm and through which the wires leading to the 



Fig. 166. 



primary coil of the transformer pass, are hollow porcelain insula- 

 tors with fusible cut-outs mounted inside. Figure' 162 shows a 

 small transformer with its connection board on top removed from 

 its case, and Fig. 163 is a top view of the open case with the 

 transformer in place. In this particular transformer the terminals 

 of the fine wire (primary) coils, only, are attached to the connec- 



