The application of electricity to railway working (1897)
Langdon, William Edward, 1832-1905 · London : Spon · leaf 139
FIG. 59. so necessary to successful block working. It is a direct-action bell. The coils are usually wound with No. 26 wire(•018 S.W.G.) to a.resistance of 45 ohms. The key is retainedin its normal position by a spiral spring working within thesmall cylinder seen in front of the bridge piece, or it…
Railroads -- Equipment and supplies · Electric apparatus and appliances
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