. Electric railway gazette . speed, and thus increase enor-mously our electromotive force. And this methodIs always employed in dynamo construction be-cause It results in an enormous saving in copper,since with one turn of the wire on an iron corea greater number of volts will be generated thanwith very many turns of wire without the Ironrevolved at the same speed. Nor is any expensespared to have this core of the softest and bestIron for the purpose, for the saving In other di-rections where the best Iron is employed in thearmature core more than counter-balances the ad-ditional cost of the e
. Electric railway gazette . speed, and thus increase enor-mously our electromotive force. And this methodIs always employed in dynamo construction be-cause It results in an enormous saving in copper,since with one turn of the wire on an iron corea greater number of volts will be generated thanwith very many turns of wire without the Ironrevolved at the same speed. Nor is any expensespared to have this core of the softest and bestIron for the purpose, for the saving In other di-rections where the best Iron is employed in thearmature core more than counter-balances the ad-ditional cost of the extra quality. EDDY CtlKRENTS IN ARMATURE. Those who have seen generator or motor arma-tures In process of construction will have noticedalso that they are not made of one solid piece butare built up of a great number of disks of thinsheet iron, each of these disks being insulatedfrom its neighbors usually by thin sheets ofpaper. This lamination, as it is called, is not for thepurpose of increasing the capacity of the Iron to. FIGS. 31 AKD lines of force, but is for the purpose of per-mitting the core to rapidly change the directionof its magnetization. As will be seen later on thearmature becomes a magnet whose poles alwayshave a constant position with regard to the fieldmagnet poles—that Is, they are stationary withregard to the latter, but since the armature is re-volving they are constantly changing with regardto a fixed point on the armature. This lamina-tion greatly facilitates this rapid shifting of these
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Keywords: ., bookcentury1800, bookdecade1890, bookidelectricrail, bookyear1895
