Reports of the Massachusetts commissioners to the exposition at Vienna, 1873With special reports prepared for the Commission . ectro-magnet a permanent magnet d is hung, with its poles soarranged as to be attracted in the direction of the dottedlines when the electro magnet is influenced by the currentfrom the battery g. The axis of the permanent magnetis carried up through the card-board e to the point h, where aneedle i is secured to it at right angles to the permanentmagnet d. The position of the main and side tracks is tracedon the card-board. The apparatus being thus shown, its operation
Reports of the Massachusetts commissioners to the exposition at Vienna, 1873With special reports prepared for the Commission . ectro-magnet a permanent magnet d is hung, with its poles soarranged as to be attracted in the direction of the dottedlines when the electro magnet is influenced by the currentfrom the battery g. The axis of the permanent magnetis carried up through the card-board e to the point h, where aneedle i is secured to it at right angles to the permanentmagnet d. The position of the main and side tracks is tracedon the card-board. The apparatus being thus shown, its operation will be easilyunderstood. As soon as the switch-lever is thrown over tochange from main to side track, it presses against s, closingthe circuit. The electro-magnet m attracts the permanentmagnet d, which swings from left to right, carrying with itthe needle ^, Avhich is thrown over to the point f. The posi-tion of the switch is thus indicated in the clearest manner atthe station. There is another interesting and useful instrument in theItalian department, employed on the upper Italian railway 57 450 EXPOSITION AT for the purpose of indicating to their principal stations frompoints outside at which several tracks diverge, the directionfrom which a train is approaching. Having been unable to secure a plan of this apparatus, orto open it in order to make a sketch, I can only presentits external appearance. Its construction, hoAvever, will bereadily understood by those familiar with the application ofelectro-magnetism as a motive force. Plate VII. At the station A Plate VII. (Milan) is an ap-paratus consisting ofa sonnerie a trembleurand a flat case or boxhung on the wall inthe office of the sta-tion-master. The caseis connected by three wires to three circuit-closers a, h and cat the junction, and by a fourth to a sonnerie which serves asa control for the signal-man. On the arrival of a train, say from Pa via, the signal-manpresses down the button at a, throwing the curre
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherbosto, bookyear1875
