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Minute impulse

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Why not synchronous motors?
== Why not synchronous motors? ==
Two problems occur with synchronous motors. <br>First, American power companies no longer maintain a long-term average of 60 Hz line frequency because most consumers are using crystal based clocks, and critical systems are always synchronized to time standards. <br>Secondly, automatic corrections made by speeding up the dials only approximated ''approximate'' the correct time. Human operations are continually required to fine tune the exact time displayed.
[[Category: Clocks]][[Category: Electrical]]
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