Historical Computer Engineering - Circuits/arithmetic units
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Circuits/arithmetic units

Relay

The following exhibit represents an vintage contact spring relay. A relay is in the majority of cases a electromagnetic, remote operated trigger with usually two switch positions. The switch position will be activated by a control circuit. In doing so an electric current triggers a magnetic field in a field coil.
Furthermore a ferromagnetic loose armature is mounted on an as well ferromagnetic core. The armature triggers one or multiple contacts when it comes to an action of force on itself. By an elastic resilience of the spring the armature will be placed in starting position when the magnetic field breaks.

Relay 1

In this case we are dealing with an contact spring relay from 1935. It is used for the changeover switching of data paths in electromechanical computer like tabulate machines or calculating punches. The cycle time is 50 ms. The relay coil is driven with a direct voltage of 110 volt.

relay

Relay 2

In this case we are dealing with an contact spring relay with four changeover contacts from 1935. It is used for the control of arithmetic logic electromechanical computer. The cycle time is 10 ms. The relay coil is driven with a direct voltage of 110 volt.

relay
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