18 THE DESIGN OF STATIC TRANSFORMERS 



large transformers which are now coming into use, efficiencies 

 of from 98 to 99 per cent, are obtained, there is but little 

 incentive, except as regards capital cost, for refraining from 

 interpolating transformers at convenient points in the system. 



FIG. 2. Outline sketch of a representative design of a shell-! ype single- 



transformer. 



Were engineers to fully recognise this point they would not be 

 so much concerned with the relative advantages and disadvan- 

 tages of different forms of electricity, since any particular kind 

 of electricity may be transformed into any other kind and at very 

 high efficiency. Even when recourse to motor-generators must 



