Clocks

Deadbeat escapement used in many pendumlum clocks.

Astronomical clock and animated figures- Prague.

Atomic clock:


FOCS 1, a continuous cold caesium fountain atomic clock in Switzerland, started operating in 2004 at an uncertainty of one second in 30 million years.

Candle clock.

Congreve's Rolling Ball clock as it appeared in his patent application of 1808.


A Rolling Ball clock from 1820 in the British Museum.

Basic digital alam clock without a radio.

Electric clock.

Hourglass.

Replica of ancient Chinese stick incense clock.

The movement in a Russian mechanical watch.

18th century oil-lamp clock.

Pendulum clock conceived by Galileo Galilei around 1637. The earliest known pendulum clock design, it was never completed.


German 19th c. pendulum wall clock.

A scale model of Su Song's Astronomical Clock Tower, built in 11th century Kaifeng, China. It was driven by a large waterwheel, chain drive, and escapement mechanism.

An elephant clock in a manuscript by Al-Jazari (1206 AD) from The Book of Knowledge of Ingenious Mechanical Devices.

A linear clock at London's Piccadilly Circus tube station. The 24 hour band moves across the static map, keeping pace with the apparent movement of the sun above ground, and a pointer fixed on London points to the current time.