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ENCE 



[Entered at the Post-Offlce of New York, N.Y., as Second-Class Matt^r.J 



A WEEKLY NEWSPAPER OF ALL THE ARTS AND SCIENCES. 



Sevknth Year. 

 Vol. XIV. No. 358. 



NEW YORK, December 13, li 



Single Copies, Ten Cents. 

 $3.50 Per Year, in Advance. 



A NEW DYNAMO AND PROJECTOR. 



A PERFECT dynamo must be correctly designed both electrically 

 and mechanically, in which case it is, with ordinary management, 

 certain to operate with satisfaction to the user, good material and 

 workmanship being presupposed. From the fact that dynamos 

 are necessarily designed by electricians, it has been observed here- 

 tofore that many types have been unsatisfactory in mechanical 



The field-magnets part along a horizontal plane, so that, by re- 

 moving the yoke and unbolting the two halves, the upper half can 

 be lifted away and the armature removed. This is convenient in 

 cramped situations. The same construction enables it to be car- 

 ried into restricted locations which would not be accessible to a 

 dynamo built in one piece. The armature itself is wound in a 

 single layer upon a laminated core, practically obviating the lia- 

 bility to heating. Ball bearings are used on both ends of the shaft. 



FIG. 



■NEW DYNAMO WITH ELEVATED BASE. 



performance. The new dynamo of the United States Electric 

 Lighting Company, here illustrated, has had the benefit of many 

 years of development. The patterns for it have recently been en- 

 tirely remodelled, to take advantage of the best (joints in the ante- 

 cedent dynamos of both the Westinghouse and United States 

 Companies, and it is consequently a most practical and efficient 

 generator. 



The lower horn of the casting is hollow, and serves as a reservoir 

 for oil running through the bearings. Oil can therefore be sup- 

 plied copiously, and drawn off and returned to the cups without 

 waste. The dynamo is carried on an elevated base, making it more 

 accessible to the operator. If desired, the legs may be removed, 

 and the base bolted to a foundation. The base is provided with 

 the usual tension-screw. 



