Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 130
m is substituted for the ring and the coils are wound on the outside surface of the drum only. 102. The Siemens drum is not made of one piece butis laminated, that is, made up of thin disks of sheet iron,insulated from each other, to avoid the so-called eddy cur-rents, set up in the core when it… … 130 MODERN ELECTRICITY the heat would injure the cotton and shellac insulation onthe wire of the armature windings. The several disks ofsheet iron are insulated from each other by layers of thintissue paper or coatings of linseed oil, which prevent theflow of current from one disk to the next, but…
Electrical engineering
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