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 375
of an automatic systemthe student will be able to follow the published descriptions of morecomplicated systems if he has occasion to do so. A number ofelectric roads have installed systems which use the rails for conduct-ing the signal current. In direct-current railw^ays alternating signalcurrent… … ELECTRIC RAILWAYS PART IV TRACK CONSTRUCTION A railway track consists of steel rails securely attached to cross-ties which in turn are placed in a bed of broken stone, gravel, or con- Ofi WOOD FA V/NG A5F/-/AL TFAV/NG o .r /■ Uli 1 68 ^8 oaAo/7 p/ne; T/r ? \ 1 1 1 1 1 1 T : i 1 { \G/rAA/\S BLOfk-S…
Electrical engineering
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