d. The fre- soft iron. For a larger quency varies in dynamo than the one practice between 150 described the iron and 35. 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 ers. The… … tery, or other source of direct current, and secondary windings might come and delivering, in place of the mechani- A HOME-HADE ALTEBITATINO CUSSEITT DYNAMO. (Continued on page 165.) 11897 SCIENTIFIC AMERICAN, INC.
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