CLOCKS AND OTHERS
These are
"slave" clocks; they are so-called as they don't have motors but
instead coils that respond each minute when a pulse is sent to the
clock by a centrally located master clock. These were very common in
schools, banks, hospitals, and other public buildings as they all are
synchronized by one master clock. The examples seen here came from
schools. The square wood model is the oldest.
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