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Therefore, another type of temperature-compensated pendulum, the mercury pendulum invented in 1721 by George Graham, was used in the highest-precision clocks. [8]: p.289 [4] By 1900, the highest-precision astronomical regulator clocks used pendulum rods of low thermal expansion materials such as invar [3] [2] and fused quartz. [4]
A list of permanent working clocks with the largest faces in the world. Entries include all clocks with faces at least 4 m (13 ft) in diameter. Clocks can be located on the exterior or interior of buildings, and towers as well as on the ground as is the case with floral clock faces.
The Edinburgh Floral Clock. A floral clock, or flower clock, is a large decorative clock with the clock face formed by carpet bedding, usually found in a park or other public recreation area. Most have the mechanism set in the ground under the flowerbed, which is then planted to visually appear as a clock face with moving hands which may also ...
A torsion pendulum clock, more commonly known as an anniversary clock or 400-day clock, is a mechanical clock which keeps time with a mechanism called a torsion pendulum. This is a weighted disk or wheel, often a decorative wheel with three or four chrome balls on ornate spokes, suspended by a thin wire or ribbon called a torsion spring (also ...
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 to tell the time, it has a large face visible from far away, and often a striking mechanism which rings ...
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Clocks faces on two towers 7.6 m (25 ft) diameter. Building part of the World Heritage Maritime Mercantile City [40] 25: Elizabeth Tower: 96 m (315 ft) 4: Yes: 1859: Tower Building: Clock Tower/Government: United Kingdom: London: Clock faces are 7 m (23 ft). Commonly known as 'Big Ben', although this is the name of the largest chiming bell.