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List Of Chronometers On HMS Beagle
Chronometers were formerly used for the accurate determination of longitude by ships at sea. By measuring the time of local solar noon compared to the time of noon at a reference point the difference in longitude can be directly found. For this system to work, a timepiece showing the time at the reference point must be carried to the measuring point. A timepiece intended to remain accurate while subjected to the motions of a ship at sea and through extreme changes in environment, especially temperature, is called a chronometer. These were first built in the 18th century and were used extensively by mariners in the 19th century and into the 20th century, even after the widespread use of radio for time signals – the time signal was used to set the chronometer, but the instrument was still necessary to display the time. HMS ''Beagle'' was an Admiralty survey ship sent on three major expeditions. The first (1826–1830) was to survey the coast of South America in company with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Museum Marine Chronometer
British may refer to: Peoples, culture, and language * British people, nationals or natives of the United Kingdom, British Overseas Territories, and Crown Dependencies. ** Britishness, the British identity and common culture * British English, the English language as spoken and written in the United Kingdom or, more broadly, throughout the British Isles * Celtic Britons, an ancient ethno-linguistic group * Brittonic languages, a branch of the Insular Celtic language family (formerly called British) ** Common Brittonic, an ancient language Other uses *''Brit(ish)'', a 2018 memoir by Afua Hirsch *People or things associated with: ** Great Britain, an island ** United Kingdom, a sovereign state ** Kingdom of Great Britain (1707–1800) ** United Kingdom of Great Britain and Ireland (1801–1922) See also * Terminology of the British Isles * Alternative names for the British * English (other) * Britannic (other) * British Isles * Brit (other) * Briton (d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward John Dent
Edward John Dent (1790–1853) was a famous English watchmaker noted for his highly accurate clocks and marine chronometers. He founded the Dent company. Early years Edward John Dent, son of John and Elizabeth Dent, was born in London on 19 August 1790. He was baptised on 18 October 1790, at St. Clement Danes Church in the Strand. Edward had a younger brother, William (born 11 February 1792). The boys' mother, Elizabeth, died while they were still young – she was buried on 16 May 1793. Interest in watchmaking At the age of 14, Dent became apprenticed to his grandfather, John Wright Dent, a tallow chandler. Under the terms of the indenture – dated 20 August 1804 – John Wright Dent was expected to find suitable lodgings for his apprentice. Fortunately, Edward John Dent's cousin, Richard Rippon, was willing to have him. Rippon was an expert watchmaker and Dent became fascinated by watchmaking and less interested in the business of making and selling candles. Indeed, Dent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Bond Street
Bond Street in the West End of London links Piccadilly in the south to Oxford Street in the north. Since the 18th century the street has housed many prestigious and upmarket fashion retailers. The southern section is Old Bond Street and the longer northern section New Bond Street—a distinction not generally made in everyday usage. The street was built on fields surrounding Clarendon House on Piccadilly, which were developed by Sir Thomas Bond, 1st Baronet, Sir Thomas Bond. It was built up in the 1720s, and by the end of the 18th century was a popular place for the upper-class residents of Mayfair to socialise. Prestigious or expensive shops were established along the street, but it declined as a centre of social activity in the 19th century, although it held its reputation as a fashionable place for retail, and is home to the auction houses Sotheby's and Bonhams (formerly Phillips (auctioneers), Phillips) and the department store Fenwick (department store), Fenwick and jewel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Finsbury Pavement
Finsbury Pavement is a short length of street connecting Moorgate with City Road in the London Borough of Islington. It forms a part of the London Inner Ring Road (as the A501 road), and before the introduction of the ring of steel around the City of London it formed a major through-route towards London Bridge and south London. History The name was formerly Moor Fields Pavement, being on the west side of the Moorfields, behind the Bethlem Hospital. Its current name derives from lying within the historic manor of Finsbury, the manor forming one of the prebends of St Paul's Cathedral, and becoming the Metropolitan Borough of Finsbury, in 1900. The area was first drained in 1527, and the existing postern made into a gate in the city wall at Moorgate. In the early 19th century, the southern end of the street was renamed Moorgate, by the City of London – and the name change marked the boundary, but today, due to boundary changes, most of the street is within the City's Coleman S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Madeira
) , anthem = ( en, "Anthem of the Autonomous Region of Madeira") , song_type = Regional anthem , image_map=EU-Portugal_with_Madeira_circled.svg , map_alt=Location of Madeira , map_caption=Location of Madeira , subdivision_type=Sovereign state , subdivision_name=Portugal , established_title=Discovery , established_date=1418-1419 , established_title2=Settlement , established_date2=c. 1425 , established_title3=Autonomous status , established_date3=30 April 1976 , named_for = en, wood ( pt, madeira) , official_languages=Portuguese , demonym= en, Madeiran ( pt, Madeirense) , capital = Funchal , government_type=Autonomous Region , leader_title1=Representative of the Republic , leader_name1=Irineu Barreto , leader_title2=President of the Regional Government of Madeira , leader_name2=Miguel Albuquerque , leader_title3=President of the Legislative Assembly , leader_name3=José Manuel Rodrigues , legislature= Legislative Assembly , national_representation=National ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Board Of Longitude
The Commissioners for the Discovery of the Longitude at Sea, or more popularly Board of Longitude, was a British government body formed in 1714 to administer a scheme of prizes intended to encourage innovators to solve the problem of finding longitude at sea. Origins Navigators and scientists had been working on the problem of not knowing a ship's longitude. The establishment of the Board of Longitude was motivated by this problem and by the 1707 grounding of four ships of Vice-Admiral Sir Cloudesley Shovell's fleet off the Isles of Scilly, resulting in heavy loss of life. Established by Queen Anne the Longitude Act 1714 named 24 Commissioners of Longitude, key figures from politics, the Navy, astronomy and mathematics. However, the Board did not meet until at least 1737 when interest grew in John Harrison's marine timekeeper. The Board administered prizes for those who could demonstrate a working device or method. The main longitude prizes were: *£10,000 for a method that co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornhill, London
Cornhill (formerly also Cornhil) is a ward and street in the City of London, the historic nucleus and financial centre of modern London. The street runs between Bank Junction and Leadenhall Street. The hill from which it takes its name is one of the three ancient hills of London; the others are Tower Hill, site of the Tower of London, and Ludgate Hill, crowned by St Paul's Cathedral. The highest point of Cornhill is at above sea level. History Cornhill is one of the traditional divisions of the City. The street contains two of the City churches designed by Sir Christopher Wren: St. Michael, Cornhill, and St Peter upon Cornhill, reputed to occupy the oldest Christianised site in London. Both are on the site of the Roman forum of ''Londinium''. At its other end it meets Threadneedle Street, Poultry, Lombard Street and others at Bank junction. Sir Thomas Gresham's original Royal Exchange fronted onto Cornhill, but its successor on the site, designed by William Tite, faces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Exchange, London
The Royal Exchange in London was founded in the 16th century by the merchant Sir Thomas Gresham on the suggestion of his factor Richard Clough to act as a centre of commerce for the City of London. The site was provided by the City of London Corporation and the Worshipful Company of Mercers, who still jointly own the freehold. The original foundation was ceremonially opened by Queen Elizabeth I who granted it its "royal" title. The current building is trapezoidal in floor plan and is flanked by Cornhill and Threadneedle Street, which converge at Bank junction in the heart of the city. It lies in the ward of Cornhill. The exchange building has twice been destroyed by fire and subsequently rebuilt. The present building was designed by Sir William Tite in the 1840s. The site was notably occupied by the Lloyd's insurance market for nearly 150 years. Today the Royal Exchange contains Fortnum & Mason The Bar & Restaurant, luxury shops, and offices. Traditionally, the steps of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Auxiliary Temperature Compensation
A balance wheel, or balance, is the timekeeping device used in mechanical watches and small clocks, analogous to the pendulum in a pendulum clock. It is a weighted wheel that rotates back and forth, being returned toward its center position by a spiral torsion spring, known as the balance spring or ''hairspring''. It is driven by the escapement, which transforms the rotating motion of the watch gear train into impulses delivered to the balance wheel. Each swing of the wheel (called a "tick" or "beat") allows the gear train to advance a set amount, moving the hands forward. The balance wheel and hairspring together form a harmonic oscillator, which due to resonance oscillates preferentially at a certain rate, its resonant frequency or "beat", and resists oscillating at other rates. The combination of the mass of the balance wheel and the elasticity of the spring keep the time between each oscillation or "tick" very constant, accounting for its nearly universal use as the time ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Sweetman Eiffe
John is a common English name and surname: * John (given name) * John (surname) John may also refer to: New Testament Works * Gospel of John, a title often shortened to John * First Epistle of John, often shortened to 1 John * Second Epistle of John, often shortened to 2 John * Third Epistle of John, often shortened to 3 John People * John the Baptist (died c. AD 30), regarded as a prophet and the forerunner of Jesus Christ * John the Apostle (lived c. AD 30), one of the twelve apostles of Jesus * John the Evangelist, assigned author of the Fourth Gospel, once identified with the Apostle * John of Patmos, also known as John the Divine or John the Revelator, the author of the Book of Revelation, once identified with the Apostle * John the Presbyter, a figure either identified with or distinguished from the Apostle, the Evangelist and John of Patmos Other people with the given name Religious figures * John, father of Andrew the Apostle and Saint Peter * Pope Joh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Balance Wheel
A balance wheel, or balance, is the timekeeping device used in mechanical watches and small clocks, analogous to the pendulum in a pendulum clock. It is a weighted wheel that rotates back and forth, being returned toward its center position by a spiral torsion spring, known as the balance spring or ''hairspring''. It is driven by the escapement, which transforms the rotating motion of the watch gear train into impulses delivered to the balance wheel. Each swing of the wheel (called a "tick" or "beat") allows the gear train to advance a set amount, moving the hands forward. The balance wheel and hairspring together form a harmonic oscillator, which due to resonance oscillates preferentially at a certain rate, its resonant frequency or "beat", and resists oscillating at other rates. The combination of the mass of the balance wheel and the elasticity of the spring keep the time between each oscillation or "tick" very constant, accounting for its nearly universal use as the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spring Detent 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 the clock's timekeeping element (usually a pendulum or balance wheel) 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 esc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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