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 210
Fig. 200. Construction of Armature Hub 181 172 DIRECT-CURRENT DYNAMO has been found necessary, in the large and heavy-duty types of to-day, to resort to means of ventilation, usually consisting of ductsvi^hich lead the air out between the core-disks. To keep the core-disks apart at these ducts, it… … Fig. 201. Spider for Bullock Armature In.l, simple pieces of brass are riveted radially at intervals to aspecial core-disk 0.04 to 0.05 inch thick. This form fails to provideadequate support for the teeth, which is obviated in B, where behindeach tooth there is a strip of brass about 0.4 inch wide…
Electrical engineering
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