Dr. Cecil Costain, Head of the Time and Frequency Section, tests apparatus from a planned new service for the distribution and maintenance of correct time. From anywhere in Canada, a commercial secondary clock can be linked by telephone line with the NRC laboratory from where its time will be corrected automatically via an electronic time code.  (NRC)

For centuries, men have sought the most accurate means to measure and monitor time. Their search has ranged from tracking the regular motions of heavenly bodies to probing the energies of atoms.

A significant advance in atomic timekeeping has lately been made in the Time and Frequency Section of the National Research Council of Canada's Division of Physics. A new cesium beam standard, Cs V, will soon begin operation as the world's most accurate clock.

Seeds of Time --  the NRC develops a cesium atomic clock

Other sites for the Atomic Clock:

Time -- The NRC's home for the Millenium Clock and information on the first cesium atomic clock