I have this vague itch to build a series of clocks as a hobby, but *without* a modern clock for reference. Eg build a mechanical clock, but use an hour glass to cal9brate first run. Bootstrap time all the way to atomic.
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The Gingery series explains how to build a modern metal working show from scratch. gingerybookstore.com/cgi-bin/sc/ss_
FYI, the way to bootstrap a straight edge from scratch is to rub three almost-straight edges against each other. Maybe there are time analogies.
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