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please tell me about Post office box with its circuit and explanations !!!!

please tell me about Post office box with its circuit and explanations !!!!

Grade:12

1 Answers

SAGAR SINGH - IIT DELHI
879 Points
10 years ago

Dear student,

The Post Office Box was a wheatstone bridge style testing device with pegs and spring arms to close electrical circuits and measure properties of the circuit under test.

The boxes were used in the UK by engineers from the then GPO, who were responsible for UK telecommunications to trace electrical faults.

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Sagar Singh

B.Tech, IIT Delhi

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