The mechanical anniversary clock, also known as the 400-day clock or torsion pendulum clock, is one of the most popular clocks ever invented. Anniversary clocks are recognizable by the decorative balls beneath the dial that rotate one way and then the other. To house the attractive mechanism, every style of clock case has been used although perhaps the most endearing is the glass dome. The dials, hands and ornamentation have also varied steadily over the last century. Called the anniversary clock because it needed winding only once a year, it has carried on into the days of no winding at all.
- ISBN10 0747807337
- ISBN13 9780747807339
- Publish Date 27 May 2009 (first published 11 April 1997)
- Publish Status Transferred
- Publish Country GB
- Publisher Bloomsbury Publishing PLC
- Imprint Shire Publications
- Format Paperback
- Pages 56
- Language English