The application of electricity to railway working (1897)
Langdon, William Edward, 1832-1905 · London : Spon · leaf 141
FIG. 61. … FIG. 62. bell may be employed. The indicator may be a disc, soarranged that on the armature being attracted it shall dis-charge a disc, which, falling outwards from the front of the to Railway Working. case becomes readily visible to the signalman. This form ofindicator is shown in Fig. 62. To the…
Railroads -- Equipment and supplies · Electric apparatus and appliances
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