Ji'n 



SCIENC 



[Entered at the Post-OfBee of New York, N.Y., as Second-Class Matter.] 



A WEEKLY NEWSPAPER OF ALL THE ARTS AND SCIENCES. 



StiVKNTH Year. 

 Vol. XIII. No. 332. 



NEW YORK, June 14, i{ 



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 (3.50 Per Year, in Advance. 



WESTINGHOUSE ALTERNATING-CURRENT DYNAMO. 



The Weslinghouse dynamo for generating an alternating cur- 

 rent is shown in tine accompanying illustration. It is apparent at 

 a glance that it is different in principle of construction from the 

 ordinary direct-current machine. The field is composed of a series 

 of radial pole-pieces of alternate polarity, the cores of which are 

 cast solid with the casing or body of the machine. The field-coils 



zontal plane through the shaft. The armature may be removed 

 and replaced in similar manner. 



The general design of the dynamo is symmetrical, and of a char- 

 acter calculated to give the greatest rigidity in its structure. Oil 

 is fed from the cups to the bearings, and allowed to work freely 

 into the drip-pan, and thence into the tank in the base, whence it 

 may be drawn off at the slop-cock, strained, and returned to the 

 oil-cups, thus permitting thorough lubrication without waste of oil. 



THE WESTINGHOUSE 15O0-LIGHT ALTERNATING-CURRENT DYNAMO. 



are a series of independent bobbins, which are first wound on 

 shells, then slipped over the pole-pieces, and held in place by bolts. 

 These bobbins, being supplied with a feeble current from the ex- 

 citer, are subject to no natural deterioration, and are not liable to 

 accident. They can only be damaged by carelessness ; and, in 

 case one should be so damaged, it may be easily removed and re- 

 placed, as the whole structure of the dynamo parts along a hori- 



The illustration shows the side of the dynamo which carries the 

 collecting-ring : the other side has a bearing similar to the one 

 shown, beyond which is an overhung pulley made of compressed 

 strawboard, which is found to be an excellent material for the pur- 

 pose. The machine rests upon a cast-iron base, and is adjustable 

 by means of a belt-tightener. The dynamo may be run in either 

 direction or placed either way around on the base. 



