Antique Morse Relay ~1945 NIB Signal Electric Mfg SW-37 Approx 7x5x4in

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Seller: bcoggs (640) 100%, Location: Reston, Virginia, Ships to: US & many other countries, Item: 123831193538 From www.telegraphlore.com: The relay is a very sensitive "amplifier" of the weak currents found in long distance telegraph circuits. Two horizontal solenoids wound with fine wire form a horseshoe magnet. This magnet is connected in series with the telegraph wire. Current in the wire causes a magnetic field to attract the lightweight armature, which is suspended vertically. The armature has one side of the relay contact-- the other side of the contact is on the adjustable screw in the "gooseneck". The fact that the armature is suspended vertically with its bearings on the relay base makes it extremely unstable. A very light force is applied by a spring, which is adjusted by a "windlass". The spring tension keeps the contacts open until the magnetic force exerted on the armature overcomes it, thereby closing the contacts. The spacing of the magnet from the armature is easily adjusted by a knurled knob. The magnet spacing plus the spring tension is easily adjusted to allow for variations in line current. Line current decreases dramatically during wet weather, thus the relay provides for a wide range of sensitivity. The relay's contacts are connected to a "local circuit". Your item will come sealed in it's original unopened original packaging from 1945. Condition: New

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