THE TRANSFORMER 



291 



which pipes cold water is circulating. This method of cooling 

 is required in very large transformers such as are frequently 

 located in stations. Evidently the method could not be 



FIG. 182. Transformer Case Built of Corrugated Steel, to Give 

 Greater Cooling Surface. General Electric Co. 



used for transformers located on poles or in out-of-doors 

 installations because of trouble due to the freezing of the 

 water, etc. A large water-cooled transformer removed 



