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reconstruction of the waterpowered mechanical clock

How do atomic clocks work?

weight-driven clock works

Great Clock, Rouen, Fr.

components in a watch

anchor escapement of a clock

verge-and-foliot clock mechanism

components of a weight-driven clock

quartz clock mechanism

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Photos and Videos

reconstruction of the waterpowered mechanical clock

weight-driven clock works

Great Clock, Rouen, Fr.

components in a watch

anchor escapement of a clock

verge-and-foliot clock mechanism

components of a weight-driven clock

quartz clock mechanism

Greenwich Mean Time

How do atomic clocks work?

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hydrogen clock wheelwork tourbillon overcoil mainspring friction drive balance spring balance turret clock quartz-crystal clock calendar sundial gnomon hourglass particle accelerator lubrication robot simple machine balance thermometer

Key People

Bracket clock with oak case, ebony veneer, and gilt bronze mounts by Thomas Tompion, c. 1690; in the Victoria and Albert Museum, London.

Thomas Tompion

English clockmaker

Simon Willard

American clockmaker

Edmund Beckett, 1st Baron Grimthorpe

British horologist

Edward John Dent

British clockmaker

Off-centre pillar-and-scroll wooden clock by Seth Thomas, c. 1818, under license from Eli Terry; in the American Clock and Watch Museum, Bristol, Connecticut.

Seth Thomas

American clockmaker

John Harrison, detail of an oil painting by Thomas King; in the Science Museum, London

John Harrison

British horologist

Chauncey Jerome clock

Chauncey Jerome

American inventor

Off-centre pillar-and-scroll wooden clock by Seth Thomas, c. 1818, under license from Eli Terry; in the American Clock and Watch Museum, Bristol, Connecticut.

Eli Terry

American craftsman

Ferdinand Berthoud

French horologist

Quare, Daniel: Queen Ann clock

Daniel Quare

English clockmaker and inventor

Quiz

barometer. Antique Barometer with readout. Technology measurement, mathematics, measure atmospheric pressure

Fun Facts of Measurement & Math

List

Calendar marking march 15th

22 Questions About Time and Timekeeping Answered