80 THE DESIGN OF STATIC TRANSFORMERS 



appear that a consequence of this state of affairs would be that 

 the smaller concern could meet the price even with a more 

 liberal outlay for material, further reflection will show that 

 on account of the smaller percentage of the total cost repre- 

 sented by establishment charges, a given percentage saving 



FIG. 48. Curves showing ratio of labour cost to cost of active material for 

 natural air-cooled and oil-cooled transformers. 



effected in the outlay for materials makes a greater percentage 

 reduction in the total works cost than a corresponding 

 percentage saving in materials in the case of a large firm with 

 abnormal establishment charges. 



In view of this latter consideration and of various disadvan- 

 tages under which the smaller firm conducts its business, it 



