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3 terms
Definitions: P
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relay x
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photoelectric relay
A relay that opens or closes an electrical circuit depending on the intensity of the light incident to a photoelectric device contained in the relay.
phototube relay
A photoelectrical relay that uses a phototube as its photoelectric device to open and close an electrical relay; used to activate counters and safety controls.
periscope
An optical instrument designed to displace the line of sight in a vertical direction. For submarines and other military uses the periscope is a long tube containing prisms at both ends and...
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