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Clock towers are a specific type of structure which house a
turret clock A turret clock or tower clock is a clock designed to be mounted high in the wall of a building, usually in a clock tower, in public buildings such as churches, university buildings, and town halls. As a public amenity to enable the community t ...
and have one or more
clock face A clock face is the part of an analog clock (or watch) that displays time through the use of a flat dial with reference marks, and revolving pointers turning on concentric shafts at the center, called hands. In its most basic, globally recogni ...
s on the upper exterior walls. Many clock towers are freestanding structures but they can also adjoin or be located on top of another building. Some other buildings also have clock faces on their exterior but these structures serve other main functions. Clock towers are a common sight in many parts of the world with some being iconic buildings. One example is the
Elizabeth Tower Big Ben is the nickname for the Great Bell of the Great Clock of Westminster, at the north end of the Palace of Westminster in London, England, and the name is frequently extended to refer also to the clock and the clock tower. The official ...
in London (usually called "
Big Ben Big Ben is the nickname for the Great Bell of the Great Clock of Westminster, at the north end of the Palace of Westminster in London, England, and the name is frequently extended to refer also to the clock and the clock tower. The official ...
", although strictly this name belongs only to the bell inside the tower).


Definition

There are many
structures A structure is an arrangement and organization of interrelated elements in a material object or system, or the object or system so organized. Material structures include man-made objects such as buildings and machines and natural objects such as ...
which may have clocks or clock faces attached to them and some structures have had clocks added to an existing structure. According to the
Council on Tall Buildings and Urban Habitat The Council on Tall Buildings and Urban Habitat (CTBUH) is an international body in the field of tall buildings and sustainable urban design. A non-profit organization based at the Monroe Building in the city of Chicago, Illinois, United State ...
a structure is defined as a building if at least fifty percent of its height is made up of floor plates containing habitable floor area. Structures that do not meet this criterion, are defined as
towers A tower is a tall structure, taller than it is wide, often by a significant factor. Towers are distinguished from masts by their lack of guy-wires and are therefore, along with tall buildings, self-supporting structures. Towers are specifica ...
. A clock tower historically fits this definition of a tower and therefore can be defined as any tower specifically built with one or more (often four)
clock A clock or a timepiece is a device used to measure and indicate time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month and the ...
faces The face is the front of an animal's head that features the eyes, nose and mouth, and through which animals express many of their emotions. The face is crucial for human identity, and damage such as scarring or developmental deformities may af ...
and that can be either freestanding or part of a
church Church may refer to: Religion * Church (building), a building for Christian religious activities * Church (congregation), a local congregation of a Christian denomination * Church service, a formalized period of Christian communal worship * Chris ...
or municipal building such as a
town hall In local government, a city hall, town hall, civic centre (in the UK or Australia), guildhall, or a municipal building (in the Philippines), is the chief administrative building of a city, town, or other municipality. It usually house ...
. Not all clocks on buildings therefore make the building into a clock tower. The mechanism inside the tower is known as a
turret clock A turret clock or tower clock is a clock designed to be mounted high in the wall of a building, usually in a clock tower, in public buildings such as churches, university buildings, and town halls. As a public amenity to enable the community t ...
. It often marks the hour (and sometimes segments of an hour) by sounding large bells or chimes, sometimes playing simple musical phrases or tunes. Some clock towers were previously built as
Bell towers A bell tower is a tower that contains one or more bells, or that is designed to hold bells even if it has none. Such a tower commonly serves as part of a Christian church, and will contain church bells, but there are also many secular bell tower ...
and then had clocks added to them. As these structures fulfil the definition of a tower they can be considered to be clock towers.


History

Although clock towers are today mostly admired for their aesthetics, they once served an important purpose. Before the middle of the twentieth century, most people did not have watches, and prior to the 18th century even home clocks were rare. The first
clock A clock or a timepiece is a device used to measure and indicate time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month and the ...
s did not have faces, but were solely
striking clock A striking clock is a clock that sounds the hours audibly on a bell or gong. In 12-hour striking, used most commonly in striking clocks today, the clock strikes once at 1:00 am, twice at 2:00 am, continuing in this way up to twelve time ...
s, which sounded bells to call the surrounding community to work or to prayer. They were therefore placed in towers so the bells would be audible for a long distance. Clock towers were placed near the centres of towns and were often the tallest structures there. As clock towers became more common, the designers realized that a dial on the outside of the tower would allow the townspeople to read the time whenever they wanted. The use of clock towers dates back to
antiquity Antiquity or Antiquities may refer to: Historical objects or periods Artifacts *Antiquities, objects or artifacts surviving from ancient cultures Eras Any period before the European Middle Ages (5th to 15th centuries) but still within the histo ...
. The earliest clock tower was the
Tower of the Winds The Tower of the Winds or the Horologion of Andronikos Kyrrhestes is an octagonal Pentelic marble clocktower in the Roman Agora in Athens that functioned as a ''horologion'' or "timepiece". It is considered the world's first meteorological stat ...
in Athens which featured eight
sundial A sundial is a horological device that tells the time of day (referred to as civil time in modern usage) when direct sunlight shines by the apparent position of the Sun in the sky. In the narrowest sense of the word, it consists of a flat ...
s and was created in the 1st century BC during the period of
Roman Greece Greece in the Roman era describes the Roman conquest of Greece, as well as the period of Greek history when Greece was dominated first by the Roman Republic and then by the Roman Empire. The Roman era of Greek history began with the Corinthian ...
. In its interior, there was also a
water clock A water clock or clepsydra (; ; ) is a timepiece by which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel, and where the amount is then measured. Water clocks are one of the oldest time-m ...
(or clepsydra), driven by water coming down from the
Acropolis An acropolis was the settlement of an upper part of an ancient Greek city, especially a citadel, and frequently a hill with precipitous sides, mainly chosen for purposes of defense. The term is typically used to refer to the Acropolis of Athens, ...
. In
Song dynasty The Song dynasty (; ; 960–1279) was an imperial dynasty of China that began in 960 and lasted until 1279. The dynasty was founded by Emperor Taizu of Song following his usurpation of the throne of the Later Zhou. The Song conquered the rest ...
China, an
astronomical clock An astronomical clock, horologium, or orloj is a clock with special mechanisms and dials to display astronomical information, such as the relative positions of the Sun, Moon, zodiacal constellations, and sometimes major planets. Definition ...
tower was designed by
Su Song Su Song (, 1020–1101), courtesy name Zirong (), was a Chinese polymathic scientist and statesman. Excelling in a variety of fields, he was accomplished in mathematics, astronomy, cartography, geography, horology, pharmacology, mineralogy, ...
and erected at
Kaifeng Kaifeng () is a prefecture-level city in east-central Henan province, China. It is one of the Eight Ancient Capitals of China, having been the capital eight times in history, and is best known for having been the Chinese capital during the Nor ...
in 1088, featuring a liquid
escapement An escapement is a mechanical linkage in mechanical watches and clocks that gives impulses to the timekeeping element and periodically releases the gear train to move forward, advancing the clock's hands. The impulse action transfers energy to ...
mechanism. In England, a clock was put up in a clock tower, the medieval precursor to
Big Ben Big Ben is the nickname for the Great Bell of the Great Clock of Westminster, at the north end of the Palace of Westminster in London, England, and the name is frequently extended to refer also to the clock and the clock tower. The official ...
, at
Westminster Westminster is an area of Central London, part of the wider City of Westminster. The area, which extends from the River Thames to Oxford Street, has many visitor attractions and historic landmarks, including the Palace of Westminster, Bucki ...
, in 1288;Clocks, ''Encyclopædia Britannica'' 5, 835 (1951). and in 1292 a clock was put up in
Canterbury Cathedral Canterbury Cathedral in Canterbury, Kent, is one of the oldest and most famous Christian structures in England. It forms part of a World Heritage Site. It is the cathedral of the Archbishop of Canterbury, currently Justin Welby, leader of the C ...
. The oldest surviving turret clock formerly part of a clock tower in Europe is the
Salisbury Cathedral clock The Salisbury Cathedral clock is a large iron-framed tower clock without a dial, in Salisbury Cathedral, England. Thought to date from about 1386, it is a well-preserved example of the earliest type of mechanical clock, called verge and foliot ...
, completed in 1306; and another clock put up at
St. Albans St Albans () is a cathedral city in Hertfordshire, England, east of Hemel Hempstead and west of Hatfield, north-west of London, south-west of Welwyn Garden City and south-east of Luton. St Albans was the first major town on the old Roman ...
, in 1326, 'showed various astronomical phenomena'.
Al-Jazari Badīʿ az-Zaman Abu l-ʿIzz ibn Ismāʿīl ibn ar-Razāz al-Jazarī (1136–1206, ar, بديع الزمان أَبُ اَلْعِزِ إبْنُ إسْماعِيلِ إبْنُ الرِّزاز الجزري, ) was a polymath: a scholar, ...
of the
Artuqid dynasty The Artuqid dynasty (alternatively Artukid, Ortoqid, or Ortokid; , pl. ; ; ) was a Turkoman dynasty originated from tribe that ruled in eastern Anatolia, Northern Syria and Northern Iraq in the eleventh through thirteenth centuries. The Artuq ...
in
Upper Mesopotamia Upper Mesopotamia is the name used for the uplands and great outwash plain of northwestern Iraq, northeastern Syria and southeastern Turkey, in the northern Middle East. Since the early Muslim conquests of the mid-7th century, the region has been ...
constructed an elaborate clock and described it in his ''Book of Knowledge of Ingenious Mechanical Devices'' in 1206. It was about high, and had multiple functions alongside
timekeeping Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, into the future. It is a component quantity of various measurements used to sequence events, to ...
. It included a display of the
zodiac The zodiac is a belt-shaped region of the sky that extends approximately 8° north or south (as measured in celestial latitude) of the ecliptic, the apparent path of the Sun across the celestial sphere over the course of the year. The path ...
and the solar and lunar paths, and a pointer in the shape of the crescent moon which travelled across the top of a
gate A gate or gateway is a point of entry to or from a space enclosed by walls. The word derived from old Norse "gat" meaning road or path; But other terms include '' yett and port''. The concept originally referred to the gap or hole in the wall ...
way, moved by a hidden
cart A cart or dray (Australia and New Zealand) is a vehicle designed for transport, using two wheels and normally pulled by one or a pair of draught animals. A handcart is pulled or pushed by one or more people. It is different from the flatbed tr ...
and causing automatic doors to open, each revealing a
mannequin A mannequin (also called a dummy, lay figure, or dress form) is a doll, often articulated, used by artists, tailors, dressmakers, window dressers and others, especially to display or fit clothing and show off different fabrics and textiles. P ...
, every hour. It was possible to re-program the length of
day A day is the time period of a full rotation of the Earth with respect to the Sun. On average, this is 24 hours, 1440 minutes, or 86,400 seconds. In everyday life, the word "day" often refers to a solar day, which is the length between two solar ...
and
night Night (also described as night time, unconventionally spelled as "nite") is the period of ambient darkness from sunset to sunrise during each 24-hour day, when the Sun is below the horizon. The exact time when night begins and ends depends on ...
daily in order to account for the changing lengths of day and night throughout the year, and it also featured five
robot A robot is a machine—especially one programmable by a computer—capable of carrying out a complex series of actions automatically. A robot can be guided by an external control device, or the control may be embedded within. Robots may b ...
ic musicians who automatically play music when moved by
lever A lever is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or '' fulcrum''. A lever is a rigid body capable of rotating on a point on itself. On the basis of the locations of fulcrum, load and effort, the lever is ...
s operated by a hidden
camshaft A camshaft is a shaft that contains a row of pointed cams, in order to convert rotational motion to reciprocating motion. Camshafts are used in piston engines (to operate the intake and exhaust valves), mechanically controlled ignition syste ...
attached to a
water wheel A water wheel is a machine for converting the energy of flowing or falling water into useful forms of power, often in a watermill. A water wheel consists of a wheel (usually constructed from wood or metal), with a number of blades or bucke ...
. Other components of the castle clock included a main
reservoir A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including control ...
with a float, a float chamber and flow regulator, plate and
valve A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fitting ...
trough, two
pulley A pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a taut cable or belt, or transfer of power between the shaft and cable or belt. In the case of a pulley supported by a frame or shell that ...
s, crescent disc displaying the zodiac, and two falcon
automata An automaton (; plural: automata or automatons) is a relatively self-operating machine, or control mechanism designed to automatically follow a sequence of operations, or respond to predetermined instructions.Automaton – Definition and More ...
dropping balls into
vase A vase ( or ) is an open container. It can be made from a number of materials, such as ceramics, glass, non-rusting metals, such as aluminium, brass, bronze, or stainless steel. Even wood has been used to make vases, either by using tree species ...
s. Al-Jazari's castle clock is considered to be the earliest programmable
analog computer An analog computer or analogue computer is a type of computer that uses the continuous variation aspect of physical phenomena such as electrical, mechanical, or hydraulic quantities (''analog signals'') to model the problem being solved. In ...
. Line (mains) synchronous tower clocks were introduced in the United States in the 1920s.


Landmarks

Some clock towers have become famous landmarks. Prominent examples include
Elizabeth Tower Big Ben is the nickname for the Great Bell of the Great Clock of Westminster, at the north end of the Palace of Westminster in London, England, and the name is frequently extended to refer also to the clock and the clock tower. The official ...
built in 1859, which houses the Great Bell (generally known as ''Big Ben'') in
London London is the capital and largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary down to the North Sea, and has been a major s ...
, the tower of
Philadelphia City Hall Philadelphia City Hall is the seat of the municipal government of the City of Philadelphia. Built in the ornate Second Empire style, City Hall houses the chambers of the Philadelphia City Council and the offices of the Mayor of Philadelphia. It ...
, the Rajabai Tower in
Mumbai Mumbai (, ; also known as Bombay — the official name until 1995) is the capital city of the Indian state of Maharashtra and the ''de facto'' financial centre of India. According to the United Nations, as of 2018, Mumbai is the second-m ...
, the
Spasskaya Tower The Spasskaya Tower ( rus, Спасская башня, Spasskaya Bashnya), translated as 'Saviour Tower', is the main tower on the eastern wall of the Moscow Kremlin which overlooks Red Square. History The Spasskaya Tower was built in 1491 by t ...
of the Moscow Kremlin, the Torre dell'Orologio in the
Piazza San Marco Piazza San Marco (; vec, Piasa San Marco), often known in English as St Mark's Square, is the principal public square of Venice, Italy, where it is generally known just as ''la Piazza'' ("the Square"). All other urban spaces in the city (exc ...
in
Venice Venice ( ; it, Venezia ; vec, Venesia or ) is a city in northeastern Italy and the capital of the Veneto region. It is built on a group of 118 small islands that are separated by canals and linked by over 400 bridges. The isla ...
, Italy, and the
Zytglogge The Zytglogge (Bernese German: ; ) is a landmark medieval tower in Bern, Switzerland. Built in the early 13th century, it has served the city as guard tower, prison, clock tower, centre of urban life and civic memorial. Despite the many redec ...
clock tower in the Old City of
Bern german: Berner(in)french: Bernois(e) it, bernese , neighboring_municipalities = Bremgarten bei Bern, Frauenkappelen, Ittigen, Kirchlindach, Köniz, Mühleberg, Muri bei Bern, Neuenegg, Ostermundigen, Wohlen bei Bern, Zollikofen , websit ...
,
Switzerland ). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel ...
.


Records

The tallest freestanding clock tower in the world is the
Joseph Chamberlain Memorial Clock Tower The Joseph Chamberlain Memorial Clock Tower, or colloquially Old Joe, is a clock tower and campanile located in Chancellor's court at the University of Birmingham, in the suburb of Edgbaston. It is the tallest free-standing clock tower in the wo ...
(Old Joe) at the
University of Birmingham , mottoeng = Through efforts to heights , established = 1825 – Birmingham School of Medicine and Surgery1836 – Birmingham Royal School of Medicine and Surgery1843 – Queen's College1875 – Mason Science College1898 – Mason Univer ...
in
Birmingham Birmingham ( ) is a city and metropolitan borough in the metropolitan county of West Midlands in England. It is the second-largest city in the United Kingdom with a population of 1.145 million in the city proper, 2.92 million in the West ...
, United Kingdom. The tower stands at tall and was completed in 1908. The clock tower of
Philadelphia City Hall Philadelphia City Hall is the seat of the municipal government of the City of Philadelphia. Built in the ornate Second Empire style, City Hall houses the chambers of the Philadelphia City Council and the offices of the Mayor of Philadelphia. It ...
was part of the tallest building in the world from 1894,"National Register of Historic Places Inventory - Nomination Form"

archive
National Park Service. page 10. Retrieved November 9, 2017. "The statue was … hoisted to the top of the tower in fourteen sections in 1894."
when the tower was
topped out In building construction, topping out (sometimes referred to as topping off) is a builders' rite traditionally held when the last beam (or its equivalent) is placed atop a structure during its construction. Nowadays, the ceremony is often parlay ...
and the building partially occupied,""History of City Hall: 1886-1890"
(archive) Retrieved November 9, 2017. "1889: Mayor Fitler moves into completed offices on west side."

(archive) Retrieved November 9, 2017. "1891: State Supreme Court opens in permanent courtroom."
until 1908. Taller buildings have had clock faces added to their existing structure such as the
Palace of Culture and Science A palace is a grand residence, especially a royal residence, or the home of a head of state or some other high-ranking dignitary, such as a bishop or archbishop. The word is derived from the Latin name palātium, for Palatine Hill in Rome whi ...
in
Warsaw Warsaw ( pl, Warszawa, ), officially the Capital City of Warsaw,, abbreviation: ''m.st. Warszawa'' is the capital and largest city of Poland. The metropolis stands on the River Vistula in east-central Poland, and its population is officiall ...
, with a clock added in 2000. The building has a roof height of , and an antenna height of . The
NTT Docomo Yoyogi Building The is a skyscraper located in the Sendagaya district of Shibuya, Tokyo, Japan. At tall, it is the fourth tallest building in Tokyo. Function The NTT Docomo Yoyogi Building is owned by the NTT Docomo group. Despite the building's name, it is ...
in Tokyo, with a clock added in 2002, has a roof height of , and an antenna height of . The
Abraj Al Bait The Clock Towers ( ar, أبراج الساعة, ʾAbrāǧ alsaa'a "Towers of the Clock") is a government-owned complex of seven skyscraper hotels in Mecca, Saudi Arabia. These towers are a part of the King Abdulaziz Endowment Project that aims ...
, a hotel complex in
Mecca Mecca (; officially Makkah al-Mukarramah, commonly shortened to Makkah ()) is a city and administrative center of the Mecca Province of Saudi Arabia, and the holiest city in Islam. It is inland from Jeddah on the Red Sea, in a narrow valle ...
constructed in 2012, has the largest and highest clock face on a building in the world, with its Makkah Royal Clock Tower having an occupied height of , and a tip height of . The tower has four clock faces, two of which are in diameter, at about high."Dokaae Tower Clock And Crescent"
. ''pct.ae''. Premier Composite Technologies. Retrieved May 21, 2018.


See also

* List of clock towers *
Bell tower A bell tower is a tower that contains one or more bells, or that is designed to hold bells even if it has none. Such a tower commonly serves as part of a Christian church, and will contain church bells, but there are also many secular bell tow ...
*
Minaret A minaret (; ar, منارة, translit=manāra, or ar, مِئْذَنة, translit=miʾḏana, links=no; tr, minare; fa, گل‌دسته, translit=goldaste) is a type of tower typically built into or adjacent to mosques. Minarets are generall ...
*
Street clock A street is a public thoroughfare in a built environment. It is a public parcel of landform, land adjoining buildings in an urban area, urban context, on which people may freely assemble, interact, and move about. A street can be as simple as ...
* Thirteenth stroke of the clock


References


External links


Towerclocks.org - Tower clocks database


Architecture of time {{DEFAULTSORT:Clock Tower Hellenistic engineering Ancient inventions Tower Ancient Greek technology Greek inventions