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 289
se, the same result could be accomplished bymodifying the diameter of the drum, but this has some limitations inthat the drum must not be so small in diameter as to have a badeffect on the cables, nor so large that the pressure between the teethof the gear and threads of worm will cause excessive… … Fig. 157. Diagram Showing Arrangement forChanging Gear Pitche.s 252 ELEVATORS 203 one of three gears and worms, and, in addition, the double pitchesjust spoken of, there are six available speeds. These are capable offurther variation either by the use of high-speed or low-speed motorsor by varying…
Electrical engineering
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