128 



ent conditions from the machines shown, 

 and he should be surprised if they had 

 the same efficiency as that shown by 

 Professor Ayrton. He might take one 

 example, which was very prominent, 

 namely, the converters used by the Gros- 

 venor Gallery. The diagram (Fig. 28) 

 showed the output of amperes in a day, 

 and it would be seen that between four 

 and seven hours in the morning, when 

 no lamps were on circuit, there was an 

 indication of four thousand lamps being 

 on circuit according to the ampere- 

 meters of the central station ; that meant 

 a waste of nearly four thousand lamps 

 always going on, and with higher loads 

 the loss was greater. The loss as shown 

 in the diagram was 20 per cent, of the 

 maximum with no load; consequently 

 when there was any load on, the efficiency 

 was certainly not 80 per cent. 



Mr. Llewelyn Atkinson said that the 

 constants which the author had de- 

 veloped, and which were very useful in 

 comparing the electromotive force of 

 alternating machines with machines of a 



