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Oud Haerlem Castle
Oud Haerlem Castle was a very strong castle in Holland. In 1351 it was demolished after a long siege. Location The location of Oud Haerlem castle is on the eastern fringe of what is now Heemskerk, just west of Amsterdam. It is 400 meter south-southeast of Assumburg Castle, which probably also dates from the thirteenth century, but was much smaller at the time. Somewhat further north northwest of Assumburg was Poelenburg Castle, of which nothing remains. About three kilometer north northwest of Oud Haerlem is Marquette Castle, which used to be called Heemskerk Castle. Marquette Castle was a large round water castle, of which only later, more square parts remain. The unusually high concentration of castles in the area has been related to the contemporary geography of the area. The 1708 map still shows how the IJ reached far inland in medieval times. It continued in the now disappeared Wijkermeer, and left only the dunes and a very narrow strip of land to connect the parts of H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heemskerk
Heemskerk () is a municipality and a town in the Netherlands, in the province of North Holland. It is located in the Kennemerland region. Local government As of March 2022, the municipal council of Heemskerk consists of 25 seats, which are divided as follows: * Heemskerk Lokaal - 9 seats * Liberaal Heemskerk - 3 seats * Democrats 66 - 3 seats * Green Left - 3 seats * People's Party for Freedom and Democracy - 3 seats * Labour Party - 2 seats * Christian Democratic Appeal - 2 seats The CDA, Heemskerk Lokaal, Liberaal Heemskerk and D66 form the governing coalition. The (non-elected) mayor of Heemskerk is currently K.S. Heldoorn ( Labour Party). History It is not certain where the name of Heemskerk comes from. The town was already known during the Middle Ages. In an official deed from the year of 1063, the town was known as ''Hemezen Kyrica'', Latinized Frisian meaning Church of Hemezen, a Frisian nun who lived in a religious house there. Heemskerk knows many historical monume ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John II, Lord Of Polanen
John III, Lord of Polanen ( – 3 November 1378 in Breda) was Lord of Polanen, Lord of De Lek and Lord of Breda. Life He was a son of John I, Lord of Polanen and Catherine of Brederode. Polanen Castle near Monster was the ancestral seat of the family. In 1327 John I had acquired Oud Haerlem Castle. In 1339, John II purchased the Lordship of Breda and built Breda Castle, together with his father. John succeeded his father in 1342 and also took over his father's position as councilor of the Count of Holland and Zeeland. In the autumn of 1343, he accompanied Count William IV on a pilgrimage to the Holy Land. He also participated in a crusade against the Prussians. He was not present in the September 1345 campaign against the Frisians, which saw William IV killed during the disastrous Battle of Warns. On 17 November 1345, John II granted Polanen Castle in arrear fief to his younger brother Philip I of Polanen. First phase of the Hook and Cod Wars William of Duivenv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electromagnetic Induction
Electromagnetic or magnetic induction is the production of an electromotive force (emf) across an electrical conductor in a changing magnetic field. Michael Faraday is generally credited with the discovery of induction in 1831, and James Clerk Maxwell mathematically described it as Faraday's law of induction. Lenz's law describes the direction of the induced field. Faraday's law was later generalized to become the Maxwell–Faraday equation, one of the four Maxwell equations in his theory of electromagnetism. Electromagnetic induction has found many applications, including electrical components such as inductors and transformers, and devices such as electric motors and generators. History Electromagnetic induction was discovered by Michael Faraday, published in 1831. It was discovered independently by Joseph Henry in 1832. In Faraday's first experimental demonstration (August 29, 1831), he wrapped two wires around opposite sides of an iron ring or "torus" (an arrange ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnetometer
A magnetometer is a device that measures magnetic field or magnetic dipole moment. Different types of magnetometers measure the direction, strength, or relative change of a magnetic field at a particular location. A compass is one such device, one that measures the direction of an ambient magnetic field, in this case, the Earth's magnetic field. Other magnetometers measure the magnetic dipole moment of a magnetic material such as a ferromagnet, for example by recording the effect of this magnetic dipole on the induced current in a coil. The first magnetometer capable of measuring the absolute magnetic intensity at a point in space was invented by Carl Friedrich Gauss in 1833 and notable developments in the 19th century included the Hall effect, which is still widely used. Magnetometers are widely used for measuring the Earth's magnetic field, in geophysical surveys, to detect magnetic anomalies of various types, and to determine the dipole moment of magnetic materials. In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ground-penetrating Radar
Ground-penetrating radar (GPR) is a Geophysics, geophysical method that uses radar pulses to Geophysical imaging, image the subsurface. It is a non-intrusive method of surveying the sub-surface to investigate underground utilities such as concrete, asphalt, metals, pipes, cables or masonry. This Nondestructive testing, nondestructive method uses electromagnetic radiation in the microwave band (radio), band (Ultra high frequency, UHF/VHF frequencies) of the radio spectrum, and detects the reflected signals from subsurface structures. GPR can have applications in a variety of media, including rock, soil, ice, fresh water, pavements and structures. In the right conditions, practitioners can use GPR to detect subsurface objects, changes in material properties, and voids and cracks. GPR uses high-frequency (usually polarized) radio waves, usually in the range 10 MHz to 2.6 GHz. A GPR transmitter and antenna emits electromagnetic energy into the ground. When the energy encounte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Enceinte
Enceinte (from Latin incinctus: girdled, surrounded) is a French term that refers to the "main defensive enclosure of a fortification". For a castle, this is the main defensive line of wall towers and curtain walls enclosing the position. For a settlement, it would refer to the main town wall with its associated gatehouses, towers, and walls. According to the 1911 ''Encyclopædia Britannica'', the term was strictly applied to the continuous line of bastions and curtain walls forming "the body of the place", this last expression being often used as synonymous with ''enceinte''. However, the outworks or defensive wall close to the enceinte were not considered as forming part of it. In early 20th-century fortification, the enceinte was usually simply the ''innermost'' continuous line of fortifications. In architecture, generally, an enceinte is the close or precinct of a cathedral, abbey, castle, etc. This definition of the term differs from the more common use of encein ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jaap Renaud
Jacob Gerard Nicolaas (Jaap) Renaud (Voorburg, 20 February 1911 - 25 April 2007) was a Dutch archaeologist and Adjunct professor at Utrecht University. Life Family Renaud's father was a house painter supervisor. His grandfather was a school teacher, whom the young Renaud often visited. Together they would visit many castles near The Hague. Renaud would recreate these in his attic from the wood of cigar boxes, including the siege equipment. At the young age of 14 he already visited The Hague municipality archives to study the history of Binckhorst Castle and its inhabitants. In the tradition of his family Renaud also became a school teacher, but during the Great Depression he could not acquire a fixed position. He married Hanna Maartense whom he had met at the (NBAS), a student movement for alcohol abstinence. Together they visited European castles by bicycle and tent. Early career Due to cost constraints academic studies were not possible for Renaud. However, his br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kasteel Oud-Haerlem Gefien Van De Broekpolder 3 (1901–2003), a Dutch journalist, diplomat, and colonial administrator
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Kasteel is the Dutch language word for a castle or château. It can also refer to: * Sparta Stadion Het Kasteel, a football stadium * Joop Kasteel (born 1964), a Dutch mixed martial artist * Piet Kasteel Petrus Albertus "Piet" Kasteel (4 November 1901 – 13 December 2003) was a Dutch journalist, diplomat, and colonial administrator. He was parliamentary editor of ', and fled to England during World War II where he served for the Dutch government- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kasteel Oud Haerlem (1901–2003), a Dutch journalist, diplomat, and colonial administrator
{{disambig ...
Kasteel is the Dutch language word for a castle or château. It can also refer to: * Sparta Stadion Het Kasteel, a football stadium * Joop Kasteel (born 1964), a Dutch mixed martial artist * Piet Kasteel Petrus Albertus "Piet" Kasteel (4 November 1901 – 13 December 2003) was a Dutch journalist, diplomat, and colonial administrator. He was parliamentary editor of ', and fled to England during World War II where he served for the Dutch government- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brederode Castle
Brederode Castle ( nl, Kasteel Brederode), also called the Ruins of Brederode ( nl, Ruïne van Brederode), is located near Santpoort-Zuid. The castle was founded in the second half of the 13th century by William I van Brederode (1215–1285). William was a descendant of the lords van Teylingen, who were related to the counts of Holland. The castle formed part of the ''high lordship Brederode'', which had been given in loan in the 13th century to the lords of Brederode by the count of Holland. The name Brederode is a reference to a wooded area called ''Brede Roede'' (literally: broad wood), that was cleared and on which the castle was built. The castle was at first not more than a tower, but around 1300 Dirk II van Brederode had the tower pulled down and replaced with a proper castle. History Siege of 1351 During the Hook and Cod wars, the Brederode family stayed loyal to Margaret of Bavaria. In 1351 the castle was besieged by Gijsbrecht van Nijenrode, who supported the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quarry
A quarry is a type of open-pit mine in which dimension stone, rock, construction aggregate, riprap, sand, gravel, or slate is excavated from the ground. The operation of quarries is regulated in some jurisdictions to reduce their environmental impact. The word ''quarry'' can also include the underground quarrying for stone, such as Bath stone. Types of rock Types of rock extracted from quarries include: *Chalk * China clay * Cinder *Clay *Coal *Construction aggregate (sand and gravel) *Coquina *Diabase *Gabbro *Granite *Gritstone *Gypsum *Limestone *Marble * Ores *Phosphate rock *Quartz *Sandstone *Slate *Travertine Stone quarry Stone quarry is an outdated term for mining construction rocks (limestone, marble, granite, sandstone, etc.). There are open types (called quarries, or open-pit mines) and closed types ( mines and caves). For thousands of years, only hand tools had been used in quarries. In the 18th century, the use of drilling and blasting operations w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trebuchet
A trebuchet (french: trébuchet) is a type of catapult that uses a long arm to throw a projectile. It was a common powerful siege engine until the advent of gunpowder. The design of a trebuchet allows it to launch projectiles of greater weights and further distances than that of a traditional catapult. There are two main types of trebuchet. The first is the traction trebuchet, or mangonel, which uses manpower to swing the arm. It first appeared in China in the 4th century BC. Carried westward by the Avars, the technology was adopted by the Byzantines in the late 6th century AD and by their neighbors in the following centuries. The later, and often larger and more powerful, counterweight trebuchet, also known as the counterpoise trebuchet, uses a counterweight to swing the arm. It appeared in both Christian and Muslim lands around the Mediterranean in the 12th century, and was carried back to China by the Mongols in the 13th century. Etymology and terminology It is uncer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
