Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 392
in order to make a direct-current machineinto a three-, four-, or six-ring converter, the number of armatureconductors must be divisible by the number of rings. Therefore,the armature shown in Fig. 301 is not suitable for a four-ring con-verter, although it is suitable for a three-ring converter.…
Electrical engineering
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