Clock face

dialfacehour handminute handwatch facedialsfacesclockfacesecond handanalog clock
A clock face, or dial, is the part of an analog clock (or watch) that displays the time through the use of a fixed-numbered dial or dials and moving hands.wikipedia
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Watch

wristwatchwatchesdigital watch
A clock face, or dial, is the part of an analog clock (or watch) that displays the time through the use of a fixed-numbered dial or dials and moving hands.
This innovation increased watches' accuracy enormously, reducing error from perhaps several hours per day to perhaps 10 minutes per day, resulting in the addition of the minute hand to the face from around 1680 in Britain and 1700 in France.

Clock

clockstimepiecemechanical clock
A clock face, or dial, is the part of an analog clock (or watch) that displays the time through the use of a fixed-numbered dial or dials and moving hands. Some special-purpose clocks, such as timers and sporting event clocks, are designed for measuring periods less than one hour.
Analog clocks indicate time with a traditional clock face, with moving hands.

Grandfather clock

longcase clocklongcase clocksgrandfather clocks
Longcase clocks (grandfather clocks) typically use Roman numerals for the hours.
The case often features elaborately carved ornamentation on the hood (or bonnet), which surrounds and frames the dial, or clock face.

Roman numerals

Roman numeralRomanRoman number
Clocks can indicate the hour with Roman numerals or Hindu–Arabic numerals, or with non-numeric indicator marks.
Clock faces that use Roman numerals normally show for four o'clock but for nine o'clock, a practice that goes back to very early clocks such as the Wells Cathedral clock of the late 14th century. However, this is far from universal: for example, the clock on the Palace of Westminster, Big Ben, uses a "normal".

24-hour analog dial

24-hour analogue dial24-hour watch24 hour analog dial
A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time.
A 24-hour watch is a type of watch with an hour hand that completes a revolution every 24 hours.

Striking clock

strikingchiming clockrack and snail
The first mechanical clocks, built in 13th-century Europe, were striking clocks: their purpose was to ring bells upon the canonical hours, to call the local community to prayer.
The striking feature of clocks was originally more important than their clock faces; the earliest clocks struck the hours, but had no dials to enable the time to be read.

Clock tower

clocktowertower clockcastle clock
These were tower clocks installed in bell towers in public places, to ensure that the bells were audible over a wide area.
Clock towers are a specific type of building which houses a turret clock and has one or more clock faces on the upper exterior walls.

Anchor escapement

deadbeat escapementdeadbeatpocket watch
Minute hands (so named because they indicated the small, or minute, divisions of the hour) only came into regular use around 1690, after the invention of the pendulum and anchor escapement increased the precision of time-telling enough to justify it. In some precision clocks, a third hand, which rotated once a minute, was added in a separate subdial.
In a grandfather clock, which had a pendulum which swung once per second, the escape wheel often had 30 teeth, which made the escape wheel rotate once per minute so the second hand could be attached to its shaft.

Clock position

7 o'clocksix o'clock positiontwelve positions
*Clock position
One imagines a clock face lying either upright or flat in front of oneself, and identifies the twelve hour markings with the directions in which they point.

Hour

htime of dayhr
In its most basic form, recognized throughout the world, the periphery of the dial is numbered 1 through 12 indicating the hours in a 12-hour cycle, and a short hour hand makes two revolutions in a day.

Minute

minmmins.
A long minute hand makes one revolution every hour.

Turn (geometry)

turnturnsrevolution
A long minute hand makes one revolution every hour.

Second

ssecmegasecond
The face may also include a second hand, which makes one revolution per minute.

Digital clock

digitalcomputer programmingDigital clocks
The term is less commonly used for the time display on digital clocks and watches.

Military

armed forcesdefensedefence
A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time.

24-hour clock

24-hour24-hour notation24-hour format
A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time.

Timer

timerstiming devicesoftware timer
Some special-purpose clocks, such as timers and sporting event clocks, are designed for measuring periods less than one hour.

Hindu–Arabic numeral system

Hindu-Arabic numeralsArabicHindu numerals
Clocks can indicate the hour with Roman numerals or Hindu–Arabic numerals, or with non-numeric indicator marks.

Clockwise

counterclockwiseCCWCW
All the hands continuously rotate around the dial in a clockwise direction – in the direction of increasing numbers.

Irish language

IrishGaelicIrish Gaelic
The word clock derives from the Irish word for bell, "Cluig".

Monk's Café

monkmonasticBrother
Irish monks travelled down through Britain and into Europe evangelising the continent again after the fall of the Roman Empire.

Fall of the Western Roman Empire

decline of the Roman Empirefall of the Roman Empirefall of Rome
Irish monks travelled down through Britain and into Europe evangelising the continent again after the fall of the Roman Empire.

Christianity

ChristianChristiansChristian faith
This was later formalised by a church bell tower as Christianity re-established itself but the name Cluig persisted and morphed into the word clock.

Canonical hours

Divine Officedaily officeDivine Services
The first mechanical clocks, built in 13th-century Europe, were striking clocks: their purpose was to ring bells upon the canonical hours, to call the local community to prayer.

Bell tower

belfrycampaniletower
These were tower clocks installed in bell towers in public places, to ensure that the bells were audible over a wide area.