1851 Great Exhibition: Official Catalogue: Class X.: Edward Ellis Allen
From Graces Guide
413. ALLEN, EDWARD ELLIS, Steel Yard Wharf, Upper Thames Street — Inventor.
Electro-magnetic railway-train alarum, for communicating with the engine-driver from any part of the train. The alarum consists of the ordinary steam whistle worked by an electro-magnet, the current passing through the side-chains; thus any additional connection between the carriages after they are attached in the usual way is avoided.
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