John Connolly's Torsion / 400 Day / Anniversary Clocks
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John Connolly has put his collection of torsion clocks online. Learn the history about this century-old type of domed clock, also known 400-day and anniversary clocks. The original mechanism was spring-driven and needed a winding by key only once a year. Battery-operated movements have become common in recent years.
John shows many examples from various decades starting around 1900. And he has some Pequegnat clocks as well. See them all here.