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Jaeger-LeCoultre's Atmos clock on display. Atmos is the brand name of a mechanical torsion pendulum clock manufactured by Jaeger-LeCoultre in Switzerland. The clock gets the energy it needs to run from temperature changes in the environment and does not need to be wound manually. It can run for years without human intervention.
The first Metamec model was a mains-powered mantle clock numbered "701" (approx. 1947). All clocks produced by Metamec were produced to a high standard, and the factory expanded with the purchase of new machines to allow them to create their own movements, rather than import the movements from other clock companies.
One of the most common and valued types of mantel clocks are the French Empire-style timepieces. Simon Willard's shelf clock (half clock, Massachusetts shelf clock) was a relatively economical clock which was produced by the celebrated Simon Willard's Roxbury Street workshop, in Boston, Massachusetts, around the first decades of the 19th century.
This is the normal standard for hand-wound as well as self-winding watches. 8-Day movements, used in clocks meant to be wound weekly, provide power for at least 192 hours but use longer mainsprings and bigger barrels. Clock mainsprings are similar to watch springs, only larger.
Considering that sundial time varies +- 15 minutes throughout the year, the Cotehele clock was a perfect instrument for measuring time in the 15th and 16th century. If run 24 hours a day (the strike can be turned off at night), it only needed adjusting every couple of days at noon with the help of a sundial whenever the sun was out.
Roy Ehrhardt (1993) European Repeaters & Clock Watches, Book 1, Heart of America Press. ISBN 0-913902-72-1. A compilation of repeaters and clock watches found in auction catalogs over the years. 170 pages. A picture and a description of each watch is given. The watches are sorted by functions and brands. The Book 2 has not been released yet.