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Bois Blanc Island Lighthouse And Blockhouse
The Bois Blanc Island Lighthouse and Blockhouse is a National Historic Site of Canada located in Ontario on Bois Blanc Island, one of the islands in the Detroit River. It consists of a lighthouse, owned by Parks Canada, and a blockhouse, which is privately owned. Lighthouse The lighthouse is a white stone tower, located at the south end of Bois Blanc Island near the mouth of the Detroit River where it opens into Lake Erie. It was built by the government of Upper Canada in 1836, in the style of an imperial tower common from the 1830s to the 1860s. Its purpose was to improve naval safety in Lake Erie, on which greater navigation was occurring because of the 1829 completion of the Welland Canal. The Legislative Assembly of Upper Canada appointed a group of commissioners, to whom a design with specifications were submitted. Although it is not known who designed the lighthouse, a local legend holds that it was Amherstburg engineer Andrew Kemp, a member of the civil branch of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limestone
Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes, such as the accumulation of corals and shells in the sea, have likely been more important for the last 540 million years. Limestone often contains fossils which provide scientists with information on ancient environments and on the evolution of life. About 20% to 25% of sedimentary rock is carbonate rock, and most of this is limestone. The remaining carbonate rock is mostly dolomite, a closely related rock, which contains a high percentage of the mineral dolomite, . ''Magnesian limestone'' is an obsolete and poorly-defined term used variously for dolomite, for limes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Legislative Assembly Of Upper Canada
The Legislative Assembly of Upper Canada was the elected part of the legislature for the province of Upper Canada, functioning as the lower house in the Parliament of Upper Canada. Its legislative power was subject to veto by the appointed List of lieutenant governors of Ontario, Lieutenant Governor, Executive Council of Upper Canada, Executive Council, and Legislative Council of Upper Canada, Legislative Council. The first elections in Upper Canada, in which only land-owning males were permitted to vote, were held in August 1792. The first session of the Assembly's sixteen members occurred in Newark, Upper Canada on 17 September 1792. Shortly before the capital of Upper Canada was moved to York, Upper Canada, York in 1796 the Assembly was dissolved and reconvened for twelve more sessions between 1797 and 1840 in modest buildings in the new capital. Members continued to be elected by land-owning males to represent counties and the larger towns. During the War of 1812, United ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Artillery Battery
In military organizations, an artillery battery is a unit or multiple systems of artillery, mortar systems, rocket artillery, multiple rocket launchers, surface-to-surface missiles, ballistic missiles, cruise missiles, etc., so grouped to facilitate better battlefield communication and command and control, as well as to provide dispersion for its constituent gunnery crews and their systems. The term is also used in a naval context to describe groups of guns on warships. Land usage Historically the term "battery" referred to a cluster of cannon in action as a group, either in a temporary field position during a battle or at the siege of a fortress or a city. Such batteries could be a mixture of cannon, howitzer, or mortar types. A siege could involve many batteries at different sites around the besieged place. The term also came to be used for a group of cannon in a fixed fortification, for coastal or frontier defence. During the 18th century "battery" began to be used as a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gun Powder
Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur, carbon (in the form of charcoal) and potassium nitrate (saltpeter). The sulfur and carbon act as fuels while the saltpeter is an oxidizer. Gunpowder has been widely used as a propellant in firearms, artillery, rocketry, and pyrotechnics, including use as a blasting agent for explosives in quarrying, mining, building pipelines and road building. Gunpowder is classified as a low explosive because of its relatively slow decomposition rate and consequently low brisance. Low explosives deflagrate (i.e., burn at subsonic speeds), whereas high explosives detonate, producing a supersonic shockwave. Ignition of gunpowder packed behind a projectile generates enough pressure to force the shot from the muzzle at high speed, but usually not enough force to rupture the gun barrel. It thus makes a good propellan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Machicolation
A machicolation (french: mâchicoulis) is a floor opening between the supporting corbels of a battlement, through which stones or other material, such as boiling water, hot sand, quicklime or boiling cooking oil, could be dropped on attackers at the base of a defensive wall. A smaller version found on smaller structures is called a box-machicolation. Terminology The structures are thought to have originated as Crusader imitations of mashrabiya. The word derives from the Old French word ''machecol'', mentioned in Medieval Latin as ''machecollum'', probably from Old French ''machier'' 'crush', 'wound' and ''col'' 'neck'. ''Machicolate'' is only recorded in the 18th century in English, but a verb ''machicollāre'' is attested in Anglo-Latin. Both the Spanish and Portuguese words denoting this structure (''matacán'' and ''mata-cães'', respectively), are similarly composed from "matar canes" meaning roughly "killing dogs", the latter word being a slur referring to infidels.Vil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
White Oak
The genus ''Quercus'' contains about 500 species, some of which are listed here. The genus, as is the case with many large genera, is divided into subgenera and sections. Traditionally, the genus ''Quercus'' was divided into the two subgenera ''Cyclobalanopsis'', the ring-cupped oaks, and ''Quercus'', which included all the other sections. However, a comprehensive revision in 2017 identified different relationships. Now the genus is commonly divided into a subgenus ''Quercus'' and a sugenus ''Cerris'', with ''Cyclobalanopsis'' included in the latter. The sections of subgenus ''Quercus'' are mostly native to the New World, with the notable exception of the white oaks of sect. ''Quercus'' and the endemic Quercus pontica. In contrast, the sections of the subgenus ''Cerris'' are exclusively native to the Old World. Legend Species with evergreen foliage ("live oaks") are tagged '#'. Species in the genus have been recategorized between deciduous and evergreen on numerous occasions, alt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fort Malden
Fort Malden, formally known as Fort Amherstburg, is a defence fortification located in Amherstburg, Ontario. It was built in 1795 by Great Britain in order to ensure the security of British North America against any potential threat of American invasion. Throughout its history, it is most known for its military application during the War of 1812 as Sir Isaac Brock and Tecumseh met here to plan the Siege of Detroit. It was the British stronghold during the war and is now a National Historic Site of Canada. The fort also had an important role in securing Upper Canada's border with Detroit during the Upper Canada Rebellion. Fort Malden also has rich and diverse history aside from its military applications. For example, it was the setting for the British Pensioner Scheme and would later become an Ontario Provincial Asylum in 1859. After the asylum was closed, Fort Malden was surveyed and privatized until the mid-nineteenth century. The historic designation of the fort came after seve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ballast
Ballast is material that is used to provide stability to a vehicle or structure. Ballast, other than cargo, may be placed in a vehicle, often a ship or the gondola of a balloon or airship, to provide stability. A compartment within a boat, ship, submarine, or other floating structure that holds water is called a ballast tank. Water should move in and out from the ballast tank to balance the ship. In a vessel that travels on the water, the ballast will remain below the water level, to counteract the effects of weight above the water level. The ballast may be redistributed in the vessel or disposed of altogether to change its effects on the movement of the vessel. History The basic concept behind the ballast tank can be seen in many forms of aquatic life, such as the blowfish or members of the argonaut group of octopus. The concept has been invented and reinvented many times by humans to serve a variety of purposes. In the fifteenth and sixteenth century, the ballast "did not cons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kingston, Ontario
Kingston is a city in Ontario, Canada. It is located on the north-eastern end of Lake Ontario, at the beginning of the St. Lawrence River and at the mouth of the Cataraqui River (south end of the Rideau Canal). The city is midway between Toronto, Ontario and Montreal, Quebec. Kingston is also located nearby the Thousand Islands, a tourist region to the east, and the Prince Edward County tourist region to the west. Kingston is nicknamed the "Limestone City" because of the many heritage buildings constructed using local limestone. Growing European exploration in the 17th century, and the desire for the Europeans to establish a presence close to local Native occupants to control trade, led to the founding of a French trading post and military fort at a site known as "Cataraqui" (generally pronounced /kætə'ɹɑkweɪ/, "kah-tah-ROCK-way") in 1673. This outpost, called Fort Cataraqui, and later Fort Frontenac, became a focus for settlement. Since 1760, the site of Kingston, Ont ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corbel
In architecture, a corbel is a structural piece of stone, wood or metal jutting from a wall to carry a superincumbent weight, a type of bracket. A corbel is a solid piece of material in the wall, whereas a console is a piece applied to the structure. A piece of timber projecting in the same way was called a "tassel" or a "bragger" in England. The technique of corbelling, where rows of corbels deeply keyed inside a wall support a projecting wall or parapet, has been used since Neolithic (New Stone Age) times. It is common in medieval architecture and in the Scottish baronial style as well as in the vocabulary of classical architecture, such as the modillions of a Corinthian cornice. The corbel arch and corbel vault use the technique systematically to make openings in walls and to form ceilings. These are found in the early architecture of most cultures, from Eurasia to Pre-Columbian architecture. A console is more specifically an "S"-shaped scroll bracket in the classic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornice
In architecture, a cornice (from the Italian ''cornice'' meaning "ledge") is generally any horizontal decorative moulding that crowns a building or furniture element—for example, the cornice over a door or window, around the top edge of a pedestal, or along the top of an interior wall. A simple cornice may be formed just with a crown, as in crown moulding atop an interior wall or above kitchen cabinets or a bookcase. A projecting cornice on a building has the function of throwing rainwater free of its walls. In residential building practice, this function is handled by projecting gable ends, roof eaves and gutters. However, house eaves may also be called "cornices" if they are finished with decorative moulding. In this sense, while most cornices are also eaves (overhanging the sides of the building), not all eaves are usually considered cornices. Eaves are primarily functional and not necessarily decorative, while cornices have a decorative aspect. A building's projecti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rubble Masonry
Rubble stone is rough, uneven building stone not laid in regular courses. It may fill the core of a wall which is faced with unit masonry such as brick or ashlar. Analogously, some medieval cathedral walls are outer shells of ashlar with an inner backfill of mortarless rubble and dirt. Square Rubble Masonry Square Rubble Masonry is where face stones are dressed (squared on all joints and beds) before laying, set in mortar and appear as the outer surface of a wall. History The sack masonry is born as an evolution of embankment covered with boards, stones or bricks. The coating was used to give the embankment greater strength and make it more difficult for the enemies to climb. The Sadd el-Khafara dam, 14 meters high and built in sacking masonry in Wadi Al-Garawi near Helwan in Egypt, dates back to 2900 - 2600 BC The Greeks called the brickwork emplecton and made use of it in particular in the construction of the defensive walls of their poleis. The Romans made extensive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
