40 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 



ye 



OTHER AMERICAN ARC LIGHT SYSTEMS 



Beginning with about 1880, several arc light systems were developed. 

 Among these were the Vanderpoele, Hochausen, Waterhouse, Maxim, 



Thomson-Houston Arc 

 Lamp, 1878. 



This is an early model with a single 

 pair of carbons. 



Thomson Double 

 Carbon Arc Lamp. 



This later model, 

 having two pairs of 

 carbons, was commer- 

 cially used for many 

 years. This lamp is 

 in the collection of 

 the Smithsonian In- 

 stitution. 



Schuyler and Wood. The direct current carbon arc is inherently more 

 efficient than the alternating current lamp, owing to the fact that the 

 continuous flow of current in one direction maintains on the positive 



