Abstract
The instrument whose design and operation is described is used to check the long-term frequency stability, to within a few parts in 106, of a 1000 c/s frequency substandard. It consists of a frequency dividing system with a division factor of 20, the nominally 50 c/s output from which is used to drive an ordinary synchronous electric clock movement. The time-keeping qualities of the latter are compared with the Greenwich time signals over a period of days.
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