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Quartz crystal clock, 1942.

Quartz crystal clock, 1942.

1942
Diagram showing how the quartz clock is checked by the stars

Diagram showing how the quartz clock checked by stars

1947
Quartz clock equipment, mounted on 6-foot 6-inch standard rack, R.3191, made by the General Post Office Research Station, Dollis Hill, London, England, 1940-1947 (see note).

Post Office Quartz Clock

1940-1947
Diagram:- Radio time signals from quartz clock

Diagram of radio time signals from quartz clock

1947
Diagram:- Putting the quartz clock right

Diagram of putting quartz clock right

1947