|
List Of Watchmakers
This chronological list of famous watchmakers is a list of those who influenced the development of horology or gained status by their creations. The list is sorted by the lifetimes of the watchmakers. Until 1400 * Amenemhet (18. Dynasty), Amemhet (1555–1505 BC), Egyptian count and engineer, ''Water clock, clepsydra''. * Ktesibios (3rd century BC), Greek engineer, ''Water clock, clepsydra with hands and Sundial, dial''. * Andronikos of Kyrrhos (1st century BC), Greek engineer, ''Water clock, clepsydra and sun dial''. * Zhang Heng (78–139), Chinese mathematician and inventor, ''Water clock, clepsydra with extra reservoir''. * Yin Gui (6th century AD), Chinese engineer, ''Water clock, clepsydra with constant water level''. * Geng Xun (7th century AD), Chinese engineer, ''balancing Water clock, clepsydra''. * Yuwen Kai (7th century AD), Chinese engineer, ''balancing Water clock, clepsydra''. * Yi Xing (683–727), Chinese Buddhist and engineer, ''astronomical clock''. * Zhang S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Horology
Chronometry or horology () is the science studying the measurement of time and timekeeping. Chronometry enables the establishment of standard measurements of time, which have applications in a broad range of social and scientific areas. ''Horology'' usually refers specifically to the study of mechanical timekeeping devices, while ''chronometry'' is broader in scope, also including biological behaviours with respect to time (biochronometry), as well as the dating of geological material (geochronometry). Horology is commonly used specifically with reference to the mechanical instruments created to keep time: clocks, watches, clockwork, sundials, hourglasses, Water clock, clepsydras, timers, time recorders, marine chronometers, and atomic clocks are all examples of Measuring instrument, instruments used to measure time. People interested in horology are called ''horologists''. That term is used both by people who deal professionally with timekeeping apparatuses, as well as enthus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ratchet (device)
A ratchet (occasionally spelled rachet) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools. The word ''ratchet'' is also used informally to refer to a ratcheting socket wrench. __TOC__ Theory of operation A ratchet consists of a round gear or a linear rack with teeth, and a pivoting, spring-loaded finger called a '' pawl'' (or ''click'', in clocks and watches) that engages the teeth. The teeth are uniform but are usually asymmetrical, with each tooth having a moderate slope on one edge and a much steeper slope on the other edge. When the teeth are moving in the unrestricted (i.e. forward) direction, the pawl easily slides up and over the gently sloped edges of the teeth, with a spring forcing it (often with an audible 'click') into the depression between the teeth as it passes the tip of each tooth. When the teeth move in the oppo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stralsund
Stralsund (; Swedish language, Swedish: ''Strålsund''), officially the Hanseatic League, Hanseatic City of Stralsund (German language, German: ''Hansestadt Stralsund''), is the fifth-largest city in the northeastern German federal state of Mecklenburg-Western Pomerania after Rostock, Schwerin, Neubrandenburg and Greifswald, and the second-largest city in the Pomeranian part of the state. It is located on the southern coast of the Strelasund, a Sound (geography), sound of the Baltic Sea separating the island of Rügen from the Pomeranian mainland.''Britannica Online Encyclopedia'', "Stralsund" (city), 2007, webpageEB-Stralsund The Strelasund Crossing with its two bridges and several ferry services connects Stralsund with Rügen, the largest island of Germany and Pomerania. The Western Pomeranian city is the seat of the Vorpommern-Rügen district and, together with Greifswald, Stralsund forms one of four high-level List of cities in Mecklenburg-Vorpommern, urban centres of the region ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rostock
Rostock (; Polabian language, Polabian: ''Roztoc''), officially the Hanseatic and University City of Rostock (), is the largest city in the German States of Germany, state of Mecklenburg-Vorpommern and lies in the Mecklenburgian part of the state, close to the border with Pomerania. With around 210,000 inhabitants, it is the third-largest city on the German Baltic Sea, Baltic coast after Kiel and Lübeck, the eighth-largest city in the area of former East Germany, as well as the List of cities in Germany by population, 39th-largest city of Germany. Rostock was the largest coastal and most important port city in East Germany. Rostock stands on the estuary of the Warnow, River Warnow into the Bay of Mecklenburg of the Baltic Sea. The city stretches for about along the river. The river flows into the sea in the very north of the city, between the boroughs of Warnemünde and Hohe Düne. The city center lies further upstream, in the very south of the city. Most of Rostock's inhabita ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nikolaus Lilienfeld
Nikolaus Lilienfeld (also Nicolaus Lillienveld, Nikolaus Lillienfeld) was a German engineer and clockmaker of the late 14th and early 15th centuries. Life and work The circumstances of Lilienfeld's life are largely unknown. It is assumed that he was born between 1350 and 1365 and died between 1420 and 1435. The place of Lilienfeld's birth or death is unknown. Lilienfeld is first attested in late 1394, when he completed the astronomical clock in Stralsund. In 1396, he was named in two Rostock records as a witness to the notarisation in connection with the founding of the Marienehe Charterhouse in Rostock; in 1406, he worked as a hydraulic engineer for the near Rügenwalde and in 1420, he received a financial grant for the construction of a water pipe for the city of Stralsund. Lilienfeld's importance results from the fact that he built the Astronomical clock, St. Nicholas Church, Stralsund, astronomical clock in St. Nicholas Church, Stralsund. This makes him the oldest cloc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astrarium
An astrarium, also called a planetarium, is a medieval astronomical clock made in the 14th century by Italian engineer and astronomer Giovanni Dondi dell'Orologio. The Astrarium was modeled after the Solar System and, in addition to counting time and representing calendar dates and holidays, showed how the planets moved around the celestial sphere in one timepiece. This was its main task, in comparison with the astronomical clock, the main task of which is the actual reading of time. A complex mechanism, it combined the functions of a modern planetarium, clock, and calendar into a singular constructive device. Devices that perform this function were known to have been created prior to the design of Dondi, though relatively little is known about them. It is occasionally erroneously claimed by the details of some sources that the Astrarium was the first mechanical device showing the movements of the planets. History Greek and Roman World The first astraria were mechanical devices. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Milan
Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nearly 1.4 million, while its Metropolitan City of Milan, metropolitan city has 3.2 million residents. Within Europe, Milan is the fourth-most-populous List of urban areas in the European Union, urban area of the EU with 6.17 million inhabitants. According to national sources, the population within the wider Milan metropolitan area (also known as Greater Milan) is estimated between 7.5 million and 8.2 million, making it by far the List of metropolitan areas of Italy, largest metropolitan area in Italy and List of metropolitan areas in Europe, one of the largest in the EU.* * * * Milan is the economic capital of Italy, one of the economic capitals of Europe and a global centre for business, fashion and finance. Milan is reco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giovanni De Dondi
Giovanni Dondi dall'Orologio (about 1330 – 19 October 1388), also known as Giovanni de' Dondi, was a Venetian physician, astronomer and mechanical engineer in Padova, now in Italy. He was a pioneer in the art of clock design and construction. The Astrarium, which he designed and built over a period of sixteen years, was a highly complex astronomical clock and planetarium, constructed some sixty years after the first all-mechanical clocks had been built in Europe, and demonstrated an ambitious attempt to describe and model the planetary system with mathematical precision and technological sophistication. Life Giovanni was the second son of Jacopo Dondi dall'Orologio and Zaccarota Centrago or Centraco of Chioggia, at that time in the Republic of Venice. His father was a doctor and astronomer, and builder of a large astronomical clock in the tower of the Palazzo Capitaniato of Padova in 1344. Giovanni lived with his father from 1348 to 1359, and shared his father's inte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Padua
Padua ( ) is a city and ''comune'' (municipality) in Veneto, northern Italy, and the capital of the province of Padua. The city lies on the banks of the river Bacchiglione, west of Venice and southeast of Vicenza, and has a population of 207,694 as of 2025. It is also the economic and communications hub of the area. Padua is sometimes included, with Venice and Treviso, in the Padua-Treviso-Venice Metropolitan Area (PATREVE) which has a population of around 2,600,000. Besides the Bacchiglione, the Brenta River, which once ran through the city, still touches the northern districts. Its agricultural setting is the Venetian Plain. To the city's south west lies the Euganean Hills, Euganaean Hills, which feature in poems by Lucan, Martial, Petrarch, Ugo Foscolo, and Percy Bysshe Shelley. Padua has two UNESCO World Heritage List entries: its Botanical Garden of Padua, Botanical Garden, which is the world's oldest, and its 14th-century frescoes, situated in Padua's fourteenth-centu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jacopo De Dondi
Jacopo Dondi dall'Orologio (1290–1359), also known as Jacopo de' Dondi, was a doctor, astronomer and clock-maker active in Padua, Italy. He is remembered today as a pioneer in the art of clock design and construction. He was the father of Giovanni Dondi dall'Orologio. Jacopo Dondi wrote on a number of subjects, including surgery, pharmacology, astrology and natural science. Life Jacopo Dondi was born in Chioggia, the son of a doctor named Isacco. He attended the University of Padua and was elected municipal physician in Chioggia in 1313. In about 1327 he married Zaccarota Centrago or Centraco, with whom he had eight children; the second-born child, Giovanni, became famous as the builder of the Astrarium. On 28 February 1334, Jacopo received Venetian citizenship from the Doge Francesco Dandolo. In 1342 he moved to Padova, where he became a professor of medicine and of astronomy at the University. He supervised the construction of a large public clock with a dial, commis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
St Albans Cathedral
St Albans Cathedral, officially the Cathedral and Abbey Church of St Alban, also known as "the Abbey", is a Church of England cathedral in St Albans, England. Much of its architecture dates from Normans, Norman times. It ceased to be an abbey following its Dissolution of the monasteries, dissolution in the 16th century and became a cathedral in 1877. Although legally a cathedral church, it differs in certain particulars from most other cathedrals in England, being also used as a parish church, of which the Dean (Christianity), dean is Rector (ecclesiastical), rector with the same powers, responsibilities and duties as those of any other Ecclesiastical parish, parish. At 85 metres long, it has the longest nave of any cathedral in England. Probably founded in the 8th century, the present building is Norman or Romanesque architecture of the 11th century, with Gothic and 19th-century additions. Britain's first Christian martyr According to Bede, whose account of the saint's l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wallingford, Oxfordshire
Wallingford () is a historic market town and civil parish on the River Thames in South Oxfordshire, England, north of Reading, south of Oxford and north west of Henley-on-Thames. Although belonging to the historic county of Berkshire, it is within the ceremonial county of Oxfordshire for administrative purposes (since 1974) as a result of the Local Government Act 1972. The population was 11,600 at the 2011 census. The town has played an important role in English history starting with the surrender of Stigand to William the Conqueror in 1066, which led to his taking the throne and the creation of Wallingford Castle. The castle and the town enjoyed royal status and flourished for much of the Middle Ages. The Treaty of Wallingford, which ended a civil war known as The Anarchy between King Stephen and Empress Matilda, was signed there. The town then entered a period of decline after the arrival of the Black Death and falling out of favour with the Tudor monarchs before ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
