[time-nuts] Updating the unit of,time: the second.

Tony Finch dot at dotat.at
Tue Jun 4 11:24:23 EDT 2019


Attila Kinali <attila at kinali.ch> wrote:
> Mike Cook <michael.cook at sfr.fr> wrote:
>
> > c. The first commercial cesium clocks were available in 1956, but the
> > second did not get redefined until 1967.  There is no rush.
>
> Which caesium beam standards were available in 1956?

The Atomichron, I think:

http://ieeemilestones.ethw.org/images/8/8d/Forman_Proc_IEEE_1985.pdf

Tony.
-- 
f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
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