1898.] on Some New Studies in Cathode and Bonfgen Radiations. 583 



on both sides of this piece of lime to be the same, the light appears to 

 be given oflf sometimes only on one side and sometimes only on the 

 other. 



With a tube such as this, excited with an alternating current, it is 

 easy to produce exceedingly high temperatures confined to a very small 



Fig. 3. — Cuthode ray lamp. 



area, and it is not at all improbable that it may be eventually found 

 possible to produce commercially and practically in this way, high 

 voltage electric lamps of much higher efficiency than the ordinary 

 incandescent filament lamp, and possibly even rivalling arc lamps. In 

 both of these latter it is necessary that the incandescent substance 



2 Q 2 



