fantastic aesthetic of the most accurate pendulum clocks ever built.
https://twitter.com/LuigiThirty/status/1475374948550119427
this 1920s clock technology could be accurate to within 1 second per year, and measurements in the 1980s confirmed that at least one such clock was accurate to within a tenth of a second per year.
here's the 1984 paper measuring the accuracy of such a clock. leapsecond.com/pend/pdf/1986-…
33 parts per billion in the 1920s is very good. you could theoretically use it as the timebase for a modern cell tower, which normally use GPS-locked ovenized quartz oscillators or sometimes rubidium.
just look at it 
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