A bit of history - the first atomic clock

The National Physical Laboratory (NPL) recently turned up this old piece of film from the 1950s.

NPL developed the first atomic clock, and this short film explains how it worked.

click here and the film should appear in a new window

NPL is well worth a visit. They hold open days every so often, and have a wealth of really useful information freely available on their web site. They also offer excellent training courses (including our Geometrical Tolerancing course).