More eye candy for the cesium nuts -- the center of a cesium beam tube is the
large copper Ramsey microwave cavity. Each generation of cesium standard uses a
different design. The 5 specimens seen here came from Corby Dawson, who's
probably hacked open more Cs tubes than all of us put together.
http://www.leapsecond.com/pages/cspeak/cesium-tube-ramsey-cavity-collection.jpg
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So, Skip, if you have the time, break open another dead tube and keep removing
layers until you expose the copper cavity itself.
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The first commercial cesium standard was the Atomichron, made by the National
Company in the late 50's. It's 10x larger than a 5061A. Some photos here,
including visible parts of the monster beam tube:
http://www.leapsecond.com/museum/nc2001/
http://www.ieee-uffc.org/main/history-atomichron.asp
/tvb
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