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A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is an approximate harmonic oscillator: It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates. From its invention in 1656 by Christiaan Huygens, inspired by Galileo Galilei, until the 1930s, the pendulum clock was the world's most precise timekeeper, accounting for its widespread use. Throughout the 18th and 19th centuries, pendulum clocks in homes, factories, offices, and railroad stations served as primary time standards for scheduling daily life, work shifts, and public transportation. Their greater accuracy allowed for the faster pace of life which was necessary for the Industrial Revolution. The home pendulum clock was replaced by less-expensive synchronous electric clocks in the 1930s and '40s. Pendulum clocks are now kept mostly for their decorative and antique value.
The Royal Observatory, Greenwich is an observatory situated on a hill in Greenwich Park in south east London, overlooking the River Thames to the north. It played a major role in the history of astronomy and navigation, and because the Prime Meridian passed through it, it gave its name to Greenwich Mean Time, the precursor to today's Coordinated Universal Time (UTC). The ROG has the IAU observatory code of 000, the first in the list. ROG, the National Maritime Museum, the Queen's House and the clipper ship Cutty Sark are collectively designated Royal Museums Greenwich.
Charlbury is a town and civil parish in the Evenlode valley, about 6 miles (10 km) north of Witney in the West Oxfordshire district of Oxfordshire, England. It is on the edge of Wychwood Forest and the Cotswolds. The 2011 Census recorded the parish's population as 2,830.
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 the clock's timekeeping element to replace the energy lost to friction during its cycle and keep the timekeeper oscillating. The escapement is driven by force from a coiled spring or a suspended weight, transmitted through the timepiece's gear train. Each swing of the pendulum or balance wheel releases a tooth of the escapement's escape wheel, allowing the clock's gear train to advance or "escape" by a fixed amount. This regular periodic advancement moves the clock's hands forward at a steady rate. At the same time, the tooth gives the timekeeping element a push, before another tooth catches on the escapement's pallet, returning the escapement to its "locked" state. The sudden stopping of the escapement's tooth is what generates the characteristic "ticking" sound heard in operating mechanical clocks and watches.
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.
The vergeescapement is the earliest known type of mechanical escapement, the mechanism in a mechanical clock that controls its rate by allowing the gear train to advance at regular intervals or 'ticks'. Verge escapements were used from the late 13th century until the mid 19th century in clocks and pocketwatches. The name verge comes from the Latin virga, meaning stick or rod.
Combe is a village and civil parish about 5 miles (8 km) northeast of Witney in Oxfordshire. It is bounded to the south and southwest by the River Evenlode, to the northwest partly by the course of the Akeman Street Roman road and partly by a road parallel with it, and to the east by the boundary of Blenheim Great Park. The 2011 Census recorded the parish's population as 768.
Cropredy is a village and civil parish on the River Cherwell, 4 miles (6.4 km) north of Banbury in Oxfordshire.
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 clocks, and is said to be the oldest working clock in the world, although similar claims are made for other clocks. Previously in a bell-tower which was demolished in 1790, the clock was restored to working condition in 1956 and is on display in the North nave aisle of the cathedral, close to the West front.
Yarnton is a village and civil parish in Oxfordshire about 1 mile (1.6 km) southwest of Kidlington and 4 miles (6 km) northwest of Oxford. The 2011 Census recorded the parish's population as 2,545.
St Laurence's Church, Combe Longa is the Church of England parish church of Combe, Oxfordshire, England. The parish is part of the Benefice of Stonesfield with Combe Longa.
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 bells upon the hours.
Idbury is a village and civil parish in the Cotswold Hills in Oxfordshire, about 4+1⁄2 miles (7 km) southeast of Stow-on-the-Wold in neighbouring Gloucestershire. The parish includes the hamlets of Bould and Foscot. The 2011 Census recorded the parish's population as 240.
The history of timekeeping devices dates back to when ancient civilizations first observed astronomical bodies as they moved across the sky. Devices and methods for keeping time have gradually improved through a series of new inventions, starting with measuring time by continuous processes, such as the flow of liquid in water clocks, to mechanical clocks, and eventually repetitive, oscillatory processes, such as the swing of pendulums. Oscillating timekeepers are used in modern timepieces.
Mixbury is a village and civil parish in Oxfordshire, about 2.5 miles (4 km) southeast of Brackley in Northamptonshire.
Benjamin Lewis Vulliamy was a clockmaker, active in 18th and 19th century Britain. He succeeded his father Benjamin Vulliamy as head of the firm and Clockmaker to the Crown.
The Castle Combe clock in St. Andrew's Church, Castle Combe, Wiltshire, England was probably made in the late 15th century. It is faceless and strikes a bell in the church tower.
The Cotehele clock is situated at Cotehele House, Calstock, Cornwall. It is the earliest turret clock in the United Kingdom still working in an unaltered state and in its original position. It was probably installed between 1493 and 1521.
St Nicholas' Church, Islip is the Church of England parish church of Islip, Oxfordshire, a village about 3 miles (5 km) east of Kidlington and 5 miles (8 km) north of Oxford.
Ahasuerus Fromanteel was a clockmaker, the first maker of pendulum clocks in Britain.
References
- ↑ "Dover Castle clock, c. 1600". Science Museum, London.
- ↑ Timbs 1868 [ page needed ]
- ↑ Harden 1938, p. 175.