?
COLD CATHODE CLOCKS
Soon after the construction of the new Long Wave High Power Transmitter was announced, the introduction of Time Signals as part of this service began being discussed...
ATOMIC FREQUENCY STANDARDS
The National Physical Laboratory took over control of the MSF Time Signal service in 1967 and introduced new Rubidium Atomic Frequency Standards and solid-state digital clocks...
?
?
WHEN THE CLOCKS CHANGED TO ATOMIC TIME
On 1st January 1972, the definition of the second changed from being based on the rotation of the Earth to being based on the Caesium Atomic Frequency Standard.
The switch from astronomic time to atomic time (which had to take place exactly at midnight) was a nerve-racking occasion for all involved...