500 



THE POPULAR SCIENCE MONTHLY. 



connection that could be used on any convenient electric railroad 

 wire. In 1888, or thereabout, Mr. S. S. Wheeler, of New York, 

 designed an electric engine which was constructed by placing a 



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Sprague electric motor, directly attached to a Silsby rotary pump, 

 on a Silsby crane-neck" steam fire-engine truck. Several hundred 

 feet of insulated wire were carried to be attached to electric con- 

 nections. This engine is now the property of the Crocker- 



