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 139
difference of potential naturally decreases some, because of the resistance of the armature and because of the counter magnetism. (See §82.) For this reason, a field rheostat is generally connected in between the two field coils, by which the strength of the field magnetism can be regulated.This… … Fig. 45. a very great constancythe compound wound ELECTRICAL ENGINEERING 139 dynamo (See fig. 45) is the best. Each field magnet is woundwith two separate coils, one of a few turns of thick wire, andthe other with many turns of fine wire. The thick wire coilsare in series with the armature and the…
Electrical engineering
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