Atmos Clock

The Atmos is the brand name of a mechanical clock manufactured by Jaeger LeCoultre in Switzerland which doesn't need to be wound up. It gets the energy it needs to run from small temperature changes in the environment, and can run for years without human intervention.
Its power source has a hermetically sealed capsule containing a mixture of gas and liquid (ethyl chloride), which expands into an expansion chamber as the temperature rises, compressing a spiral spring; with a fall in temperature the gas condenses and the spring slackens. This motion constantly winds the mainspring. A variation in temperature of only one degree in the range between 15 and 30 degrees Celsius is sufficient for two days' operation.
 

In order to run the clock on this small amount of energy, everything inside the Atmos has to work in as friction-free a manner as possible. For timekeeping it uses a torsion pendulum, which consumes less energy than an ordinary pendulum. The torsion pendulum executes only two torsional oscillations per minute, which is 150 times slower that the pendulum in a conventional clock.

In 1928, an engineer in Neuchatel, Switzerland named Jean-Leon Reutter built a clock driven by a mercury-in-glass expansion device. The device rotated a cylinder which then wound the mainspring by ratchet. The mechanism operated on temperature changes alone. It took the Jaeger-LeCoultre workshop a few more years to convert this idea into a technical form that could be patented.

An early predecessor is Cox's timepiece, a clock developed in the 1760s by James Cox and and John Joseph Merlin. The oldest predecessor still running today is the 1864 Beverly Clock.
 
The Atmos- Atmospheric- almost Perpetual Motion Clock & a strange history
Thanks to his friend César de Trey , (also a contributor to the creation of the Reverso), Jacques-David LeCoultre discovers the fascinating "eternal" clock. After a detailed scrutiny of its mechanism, he notes that only the finest watchmakers will be able to rise to this technical challenge. Jean-Léon Reutter shares this conviction and after years of research was issued a patent in 1926. In 1928, the the first prototypes of a clock that draws its energy from the slightest atmospheric variations is presented. Entirely made within the Manufacture since 1936, the Atmos has become a legend of its time. Its prestige earns it status as the official gift of the Swiss government.
 
Initially it was made in a variety of designs, but by 1937 it was decided to give so unique a mechanism a distinctive outward appearance. Accordingly, the old designs were withdrawn and replaced by the one still in use. It is a simple yet elegant open-dial model made of brass, set on a brass base and covered by a detachable case consisting of four crystal sides and a crystal top set in a brass framework. As of 1954, neither the mechanism nor the design had been patented. The name Atmos, however, which is always used to describe this atmospherically operated clock, has been registered in the United States Patent Office, as the property of Establissements Ed. Jaeger of France.
 
Link: How the Atmos clock works
this link has a very nice close up picture of the Jaeger LeCoultre Atmos clock
Jaeger LeCoultre Baby Atmos Clock, 526-5, Cleaned, Serviced, Timed, Runs Great

Jaeger LeCoultre Baby Atmos Clock, 526-5, Cleaned, Serviced, Timed, Runs Great

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jaeger lecoultre atmos clock

jaeger lecoultre atmos clock

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VINTAGE 1950'S LE COULTRE  ATMOS 15 JEWEL MANTEL CLOCK COMPLETE NON RUNNING

VINTAGE 1950'S LE COULTRE ATMOS 15 JEWEL MANTEL CLOCK COMPLETE NON RUNNING

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JAEGER- LeCoultre Atmos GOLD and RHODIUM Mantel Clock

JAEGER- LeCoultre Atmos GOLD and RHODIUM Mantel Clock

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BEAUTIFUL! VINTAGE LE COULTRE CALIBRE 528-8 ATMOS DESK CLOCK VERY RARE NEW!!

BEAUTIFUL! VINTAGE LE COULTRE CALIBRE 528-8 ATMOS DESK CLOCK VERY RARE NEW!!

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vintage jaeger lecoultre brass atmos clock runs sporadically

vintage jaeger lecoultre brass atmos clock runs sporadically

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Jaeger LeCoultre Atmos Clock Model 528-8 Swiss Shelf Mantel Clocks 15j Older NR

Jaeger LeCoultre Atmos Clock Model 528-8 Swiss Shelf Mantel Clocks 15j Older NR

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Jaeger Lecoultre Atmos 540 Caliber Clock Pre Owned READ FULL DESCRIPTION

Jaeger Lecoultre Atmos 540 Caliber Clock Pre Owned READ FULL DESCRIPTION

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Atmos Clock In Very Good Working Condition.. Serial #163800

Atmos Clock In Very Good Working Condition.. Serial #163800

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Jaeger LeCoultre Atmos Clock, Model 528-8, Cleaned, Serviced, Timed, Runs Great

Jaeger LeCoultre Atmos Clock, Model 528-8, Cleaned, Serviced, Timed, Runs Great

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jaeger lecoultre Atmos Swiss Made Mantle Clock

jaeger lecoultre Atmos Swiss Made Mantle Clock

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atmos lecultre clock serial # 277236 runs seems to gain time

atmos lecultre clock serial # 277236 runs seems to gain time

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Jaeger LeCoultre Baby Atmos Clock, 526-5, Cleaned, Serviced, Timed, Runs Great

Jaeger LeCoultre Baby Atmos Clock, 526-5, Cleaned, Serviced, Timed, Runs Great

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Jaeger LeCoultre Atmos Caliber 540 Mantle Clock,13 Jewels, Instructions

Jaeger LeCoultre Atmos Caliber 540 Mantle Clock,13 Jewels, Instructions

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Jaeger - LeCoultre Atmos Perpetual Motion Clock

Jaeger - LeCoultre Atmos Perpetual Motion Clock

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Jaeger LeCoultre Atmos Clock, Model 528-8. Running and keeping accurate time.

Jaeger LeCoultre Atmos Clock, Model 528-8. Running and keeping accurate time.

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Atmos clock Embassy Dial Face Hands

Atmos clock Embassy Dial Face Hands

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ATMOS LECOULTRE 15 JEWELS SWISS MADE CLOCK

ATMOS LECOULTRE 15 JEWELS SWISS MADE CLOCK

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Le Coultre Atmos Clock 1940s excellent condition

Le Coultre Atmos Clock 1940s excellent condition

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Jaeger LeCoultre Atmos Caliber 540 Mantle Clock,13 Jewels, Owner's Manual

Jaeger LeCoultre Atmos Caliber 540 Mantle Clock,13 Jewels, Owner's Manual

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