165 



the circle upon A B. If circumstances 

 were as in Fig. 34, then E might come 

 between 3 and Q, and be outside the 

 circle upon A B. Thus there would be, 

 for such a point, stability for both 

 machines at the same time that both 



Fig. 34 



machines would take part in heating the 

 circuit. The possibility of such an 

 arrangement had been denied by Dr. 

 Hopkinson in this Institution, and wide 

 currency had been given to his statement. 

 It should be distinctly understood that 

 the statement was not one of general 



