slave clock

horology

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July 16, 2026

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A slave clock is an auxiliary apparatus for a precision astronomical clock. Its purpose is to relieve the main clock of most of its work, ensuring consistent performance. This contrasts with a master clock, which regulates or powers distant clocks, often through electrical signals. The term "slave" in this context refers to a device operated by remote control or responding to master controls, rather than its historical association with slavery. Clocks, in general, are machines that use a regular, repeating movement to count intervals of time.1234

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Electric clocks
…series of distant dials, or slave clocks, advancing the hands of each through the space of a half minute. Thus, a master clock can control scores of dials in a large group of buildings, as well as such other apparatus as time recorders and sirens.
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…series of distant dials, or slave clocks, advancing the hands of each through the space of a half minute. Thus, a master clock can control scores of dials in a large group of buildings, as well as such other apparatus as time recorders and sirens.
Read More