[time-nuts] A small piece on HP's hydrogen maser in 1968

[Mark Kahrs]

Thanks, also consider the HP patent:

http://www.google.com/patents/US3407295




On Tue, Feb 25, 2014 at 4:40 PM, Tom Van Baak <tvb at leapsecond.com> wrote:

> > So what's all this about a Thallium Beam Tube???
>
> For info about the pro/con of Thallium beam frequency standards, see:
>
> http://tf.boulder.nist.gov/general/pdf/9.pdf
> http://tf.boulder.nist.gov/general/pdf/211.pdf
> http://leapsecond.com/history/1965-Metrologia-v1-n3-Cesium.pdf
>
> Imagine 21310.833946 MHz instead of 9192.631770 MHz...
>
> /tvb
>
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