24 



Messrs. Morton, Mayer, and Thomas on 



Fij?: 1. 



RESISTANCE, IN OHMS. 



transformed; and this also we have given in the following 

 Table, expressed in foot-pounds and in horse-power. 



These results are also expressed in the curve (fig. 2); and it 

 is interesting to notice the general similarity of this curve 

 to that of fig. 1. 



It might at first seem desirable to establish a temperature- 

 ratio in the same connexion ; but when we reflect that this 

 would depend on a number of conditions liable to variation 

 with individual lamps, and would really have no practical 



