On 7/13/19, jim bell <jdb10987@yahoo.com> wrote:
WWII ... Building not demolished until about 1997
Doubt any such non top-secret dusty places made it past 2000 unravaged by remodelers, various forms of take-it-home collectors, and renewed searches by archivists.
https://en.wikipedia.org/wiki/Shortt%E2%80%93Synchronome_clock
Though out of sync, the one pictured has 6.5 inHg vac on it, likely from the draw on the bottom left :) Here's an earlier generation... https://en.wikipedia.org/wiki/Riefler_escapement
Get three clocks, and you can begin to do serious work about learning how accurate your knowledge of their performance really is.
Yes, lot's of things use comparison schemes... NTP discrimination, Shuttle guidance computers, nonstop computing, some filesystems, GPS, etc. Lots of cool stuff on ebay, especially back during dotbomb and other thinning cycles.