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 165
rm part of the spideritself (Fig. 149) or of a separate frame keyed to the skeleton pulley(Fig. 150). The spokes are usually elliptical in cross-section, andare generally made of cast iron or steel. They should be designedadequately to support and drive the armature. 140 CALCULATIONS 131 From a… … Fig. 149. Armature Driven by SpokeaForming Part of Spider in order that the safe workingstresses of the material utihzedmay not be exceeded. In theseformulas 6„ = Breadth of an arm par-allel to the shaft, in inches; /j = Safe working stress ofthe material for shearing, in lbs. per sq. in., which,…
Electrical engineering
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