Telegraph relay, ca. 1900
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A telegraph relay, used as a signal amplifier in long-distance circuits, is often referred to as a "pony relay."
The base is cast iron, topped by a wooden plate. Two induction coils with steel covers are attached to a brass frame. Stamped into the wooden plate is the information: "W.U. Tel Co, Morse relay 4-B, 150 ohms."
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