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Directory:Atmos, the Clock Powered by Temperature and Atmospheric Pressure Changes

Lasted edited by Andrew Munsey, updated on June 15, 2016 at 12:49 am.

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Page first featured March 31, 2010

[[Image:Atmos clock crop 200.jpg|right|frame|"In the year 1833, the LeCoultre Company was founded in Switzerland. The invention of the clock that they named the ATMOS was such a revolutionary development, it stood the clock world on its ear. The ATMOS was called "THE PERPETUAL MOTION CLOCK." Although every mechanical device and machinery eventually wears out, the Atmos is as close as it comes to an everlasting machine. No hand-winding, no battery or electricity is ever key comes with this wonderful clock. It is powered only by changes in the atmosphere around it." ]

Compiled by Congress:Founder:Sterling D. Allan

Pure Energy Systems News

Atmos is the brand name of a mechanical clock that has been manufactured by Jaeger-LeCoultre in Switzerland since 1935 which doesn't need to be wound and which keeps very accurate time. It gets the energy it needs to run from small temperature changes and atmospheric pressure changes in the environment, and can run for years without human intervention.

This gave rise to the endearing name: "The Perpetual Motion Clock," though the energy source is clearly from the environment. It is no more "perpetual" than a tide or ocean wave energy harvesting device.

Its power source is 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 temperature variation of only one degree in the range between 15 and 30 degrees Celsius, or a pressure variation of 3 mmHg, 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 1/60th the rate of the pendulum in a conventional clock. No oil is ever needed due to the smooth and slow rotation of the pendulum disc and no measureable wear occurs.

While these devices clearly work, based on long-established science, they are terribly expensive, at several thousand dollars each – just a conversation piece for the rich.

We feature this device here in hopes that it might inspire something more monumental and practical using some of these same principles.

Official Websites

Atmos Classique

Jaeger-LeCoultre Atmos clocks

Dealers / Repair – specializes in the repair and restoration of all Atmos Clock models

Basic Information on the Atmos


Quoting from

The first clock powered by changes in atmospheric pressure and temperature was invented by There was an error working with the wiki: Code[1] in the early seventeenth century. Drebbel built as many as 18 of these, the two most notable being for King James VI & I of Britain, and Rudolf II of Bohemia. The King James clock was known as the There was an error working with the wiki: Code[2], and was famous throughout Europe.

Experimental clocks powered by atmospheric pressure and temperature changes were next made during the Age of Enlightenment. Early examples are a clock developed by There was an error working with the wiki: Code[3] in 1740, and There was an error working with the wiki: Code[4], a clock developed in the 1760s by James Cox and John Joseph Merlin. The oldest predecessor still running today is the 1864 There was an error working with the wiki: Code[5].

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 There was an error working with the wiki: Code[6]-in-glass expansion device. The mechanism operated on temperature changes alone.

On June 1, 1929, Compagnie Générale de Radio (CGR) in France began manufacturing the first commercial model, Atmos 1, which used a mercury and ammonia bellows power source. On July 27, 1935 Jaeger-LeCoultre took over production of Atmos 1 while it developed a second design which used the present ethyl chloride power source. This model, later named the Atmos 2, was announced January 15, 1936, but problems delayed full production until mid 1939. Subsequent models were based on this design. To date, over 500,000 Atmos clocks have been produced.

Discussion - A group of horological professionals, who routinely overhaul the Atmos. We focus on the proper overhauling, dating, information exchange, and research on the Reutter and LeCoultre Atmos clocks.



LeCoultre Atmos Clock History

The Atmos clock page

How the Atmos works - Detailed drawing of movement, gallery of pictures.

Mike's Clock Clinic - Clock repairer specializes in Atmos much info on models, part supply, history.

Wireless Sensor Networks: Architectures and Protocols. pp. 157–158 touch on the Atmos clock. (Callaway, Edgar H. (2003) US: CRC Press. ISBN 9780849318238.)



Jaeger-LeCoultre, the current manufactures of the Atmos

After Sales Service

111 Eight Avenue, Suite # 500

New York City, NY 10011

1-800-552-4230 Fax: 1-917-606-7096

Manufacture Jaeger LeCoultre SA

Rue de la Golisse 8

CH-1347 Le Sentier


+41-21-845-02-02 or Fax +41-21-845-05-50

E-mail: []