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. . edby an arc as are copper contacts, and which are more cheaply re-newed. The main contact through the circuit breaker, in either type,is made between copper jaws of sufficient cross-section for carryingthe current without heating. These jaws open before the currentis finally broken by the
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. . edby an arc as are copper contacts, and which are more cheaply re-newed. The main contact through the circuit breaker, in either type,is made between copper jaws of sufficient cross-section for carryingthe current without heating. These jaws open before the currentis finally broken by the smaller contacts which take the final examples of circuit-breaker construction are shown in and 153. In each, a laminated copper brush bridges betweentwo copper terminal blocks, and is pressed firmly against these by 273 176 ELECTRIC RAILWAYS a toggle joint, operated by a handle. The closed position is main-tained against the resistance of a spring by means of a catch whichis released by the armature of a tripping coil which carries the maincurrent. If desired a shunt tripping coil can also be used. Theauxiliary contacts at which the circuit is finally broken are shown atthe top. These open after the copper brush contacts. On the switchboard, in addition to the circuit breaker, there. IlK. I-T-E Circuit Breaker is usually an ammeter to indicate the current passing from the gener-ator; and a rheostat handle, geared to a rheostat back of the board,for cutting in and out the resistance in the shunt-field coils of the gen-erator to reduce or to raise the voltage. There is also a small switchfor opening and closing the circuit through the shunt-field coils. The main leads from the generator pass through two single-polequick-break knife swatches. The most recent practice is to havethe switches on the switchboard in only the positive and the negative 274 ELECTRIC RAILWAYS 177 leads from the generator, leaving connection to the equalizer to bemade by a switch lo
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Keywords: ., bookauthoramericantechnicalsoci, bookcentury1900, bookdecade1910
