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 287
d for holding it while being loadedand unloaded. Tandem Gear. Another type of worm gear—called the tandemgear—is quite an old idea, having been patented over thirty yearsago by a Boston firm. It consists of two worms or coarse pitchscrews, Fig. 153, usually forged solid on one shaft; one screw… … SMALL ALTERNATING-CURRENT AUTOMATIC PUSH-BUTTON ELEVATOR ENGINE Courtesy of Warner Elevator Manufacturiny Co)ni>any ELEVATORS 201 thread of tlie worm—and the gears were set so that they meshedtogether. Later some makers used spur gears in addition to twoworm wheels, Fig. 154, and bolted them…
Electrical engineering
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