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Scientific American, Vol. 77, No. 11 (1897) (1897)
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per second. The fre- soft iron. Fora larger quency varies in dynamo than the one practice between 150 described the iron and 25. It will be ring can be very readily seen that the easily made by using greater the number blacksmith’s rollers, of poles and the known as tire bend- greater the speed at… … tery, or other source of direct current, and secondary windings might come and delivering, in place of the mechani- (Continued on page 165.) © 1897 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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