. The working and management of an English railway . Fig. 14. Fletchers Combixed Block Telegraph Apparatus and Bell. down lines, and the bell, are combined in one instrument.(See Fig. 14.) The novelty lies, not so much in thecombination, as in the mode of actuating the indicators,the advantages claimed for the invention being (i) areduction in cost, and (2) considerable economy m TELEGRAPHS. 9> space, which is a great desideratum in the smaller signalcabins. The one-wire system differs from the three-wire, inso far as the indicator of the instrument is moved over tothe different positions b
. The working and management of an English railway . Fig. 14. Fletchers Combixed Block Telegraph Apparatus and Bell. down lines, and the bell, are combined in one instrument.(See Fig. 14.) The novelty lies, not so much in thecombination, as in the mode of actuating the indicators,the advantages claimed for the invention being (i) areduction in cost, and (2) considerable economy m TELEGRAPHS. 9> space, which is a great desideratum in the smaller signalcabins. The one-wire system differs from the three-wire, inso far as the indicator of the instrument is moved over tothe different positions by a momentary current, and is. Fig. Block Telegraph Instrument. afterwards held there by induced magnetism, the wirebeing left free for any succeeding signals. The modeof working is about the same, only that there are buttwo positions, viz., Line clear, and Train on line, andno vertical position. (See Fig. 15.) 92 AN ENGLISH RAIL WA V. The Tell-tale instruments are somewhat similar inconstruction to the three-wire, the difference being thatthe commutator is provided with a revolving disc,lettered line closed (indicator vertical), line clear,and train on line, and Nos. 2 to 6 on the remainingfive sections of the disc. Up to the point of getting onetrain in the section, the operation is exactly the same aswith the ordinary three-wire instrument>, but as eachadditional train is admitted into the section a corre-sponding disc is brought forward ; and also as the trainspass out of the section the same disc is moved back,section by section, until the line is again clear, and theindicator is left at the nor
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectlondonandnorthwester
