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An Atmos can therefore expect to enjoy a service life of a good 600 years, although with today's air pollution a through cleaning is recommended about every twenty years.
Admirers of advanced technology, however, aren't the only ones who get their money's worth.
Connoisseurs of elegant forms, precious materials and traditional craftsmanship, do so as well.
Because every Atmos is still made entirely by hand; and with some models a single clock takes a whole month to produce.
So it's not surprising that 60 million Atmos clocks together consume no more energy that one 15-watt light bulb.
All its other parts, too, are not only of the highest precision, but also practically wear-free.
But it took the Jaeger-Le Coultre workshop a few more years to convert this idea into a technical form that could be patented.
The first Atmos clock was designed by Jean-Léon Reutter, an engineer in Neuchâtel, Switzerland, in 1928.
This noncommercial prototype, which predated the Atmos name but is now known unofficially as Atmos 0, was driven by a mercury-in-glass expansion device.
The King James clock was known as the Eltham Perpetuum, and was famous throughout Europe. Clocks powered by atmospheric pressure and temperature changes were subsequently developed by Pierre de Rivaz in 1740, and by James Cox and John Joseph Merlin (Cox's timepiece) in the 1760s.
The Beverly Clock in Dunedin, New Zealand, is still running despite never having been manually wound since its construction in 1864.
Atmos is the brand name of a mechanical torsion pendulum clock manufactured by Jaeger-Le Coultre in Switzerland which does not need to be wound manually.