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2. Torsion pendulum clock - Wikipedia

   en.wikipedia.org/wiki/Torsion_pendulum_clock

   The Atmos clock, made by Jaeger-LeCoultre, is a type of torsion pendulum clock that winds itself. The mainspring which powers the clock's wheels is kept wound by small changes in atmospheric pressure and/or local temperature, using a bellows mechanism. Thus no winding key or battery is needed, and it can run for years without human intervention.

3. Mainspring - Wikipedia

   en.wikipedia.org/wiki/Mainspring

   After winding, the arbor is stationary and the pull of the mainspring turns the barrel, which has a ring of gear teeth around it. This meshes with one of the clock's gears, usually the center wheel pinion and drives the wheel train. The barrel usually rotates once every 8 hours, so the common 40-hour spring requires 5 turns to unwind completely.

4. Pendulum clock - Wikipedia

   en.wikipedia.org/wiki/Pendulum_clock

   A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is an approximate harmonic oscillator : It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates.

5. Carriage clock - Wikipedia

   en.wikipedia.org/wiki/Carriage_clock

   Carriage clock, Armand Couaillet Matthew Norman carriage clock with winding key. A carriage clock is a small, spring-driven clock, designed for travelling, developed in the early 19th century in France. The first carriage clock was invented by Abraham-Louis Breguet for the Emperor Napoleon in 1812.

6. Atmos clock - Wikipedia

   en.wikipedia.org/wiki/Atmos_clock

   Older Atmos clock. The first clock powered by changes in atmospheric pressure and temperature was invented by Cornelis Drebbel in the early 17th 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 Eltham Perpetuum, and was ...

7. Maintaining power - Wikipedia

   en.wikipedia.org/wiki/Maintaining_power

   Huygens' maintaining power in use. The weight drive used by Christiaan Huygens in his early clocks acts as a maintaining power. In this layout, the weight which drives the clock is carried on a pulley and the cord (or chain) supporting the weight is wrapped around the main driving wheel on one side and the rewinding wheel on the other.

8. Wheel train - Wikipedia

   en.wikipedia.org/wiki/Wheel_train

   The core of the keyless mechanism is a gear on the watch's winding stem, the clutch (or castle wheel in Britain), with two sets of axial gear teeth on it, which slides in and out. When the stem is pushed in, a lever slides the clutch out, and the outer set of teeth engages a small wheel train which turns the mainspring arbor, winding the ...

9. Alarm clock - Wikipedia

   en.wikipedia.org/wiki/Alarm_clock

   This is an accepted version of this page This is the latest accepted revision, reviewed on 25 February 2025. Type of clock A traditional wind-up (key-wound), mechanical spring-powered alarm clock An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or ...