An electric clock in which the current is regulated and accuracy maintained by the regular vibrations of a quartz crystal.
- The quartz clock was so accurate and reliable, that already by 1939 it had replaced the mechanically-regulated clocks at the Observatory in Greenwich.
- The first person to build the quartz clock was a Canadian born engineer, Warren Marrison of Kingston, Ontario.
- It was in that year that the original quartz clock was invented by W.A. Marrison and J.W. Horton.
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