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Point Clark Lighthouse
Point Clark Lighthouse is located on in a beach community, Point Clark, Ontario, near a point that protrudes into Lake Huron. Built between 1855 and 1859 under the instructions of the Board of Works, Canada West, it is one of the few on the Great Lakes to be made primarily from stone. It is one of the Imperial Towers, a group of six nearly identical towers built by contractor John Brown for the "Province of Canada" (Canadian government) on Lake Huron and Georgian Bay, all completed by 1859. The location for the Point Clark lighthouse was selected to warn sailors of the shoals (sandbars) off the Lake Huron coast. It is still functioning as an automated light. A restoration that eventually exceeded $2.3 million started in 2011 and the facility reopened for tourism in June 2015. The origin of the designation ''Imperial'' is not certain, but some historians speculate that because the towers were public construction built under the colonial administration while Canada was a self-gov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Point Clark
Point Clark is a lakefront cottage community on Lake Huron, in Ontario Canada. It is approximately 15 kilometres south of Kincardine and 40 kilometres north of Goderich. Main streets include Huron Road and Lake Range Road. Point Clark is served by Highway 21 (Ontario). It is a cottage town, and has a rare Imperial Tower style lighthouse. There is a sandy beach and a small harbour with a boat ramp. There are two streams or rivers that run into Lake Huron around Point Clark: Clark Creek and Pine River. There is a separate harbour in the mouth of the Pine River. Amberley is just outside and to the south of Point Clark and Lucknow is to the south-east of Point Clark. This lighthouse of one of six Imperial Towers built in the 1850s on Lake Huron and Georgian Bay. They were built at a time when commercial shipping traffic was increasing on the Great Lakes between Canada and the U.S. because of new trade agreements and the opening of the Sault Ste. Marie Canal locks in 1855. The Bruce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Focal Plane
In Gaussian optics, the cardinal points consist of three pairs of points located on the optical axis of a rotationally symmetric, focal, optical system. These are the '' focal points'', the principal points, and the nodal points. For ''ideal'' systems, the basic imaging properties such as image size, location, and orientation are completely determined by the locations of the cardinal points; in fact only four points are necessary: the focal points and either the principal or nodal points. The only ideal system that has been achieved in practice is the plane mirror, however the cardinal points are widely used to ''approximate'' the behavior of real optical systems. Cardinal points provide a way to analytically simplify a system with many components, allowing the imaging characteristics of the system to be approximately determined with simple calculations. Explanation The cardinal points lie on the optical axis of the optical system. Each point is defined by the effect the opti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lighthouses On The National Historic Sites Of Canada Register
A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways. Lighthouses mark dangerous coastlines, hazardous shoals, reefs, rocks, and safe entries to harbors; they also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and has become uneconomical since the advent of much cheaper, more sophisticated and effective electronic navigational systems. History Ancient lighthouses Before the development of clearly defined ports, mariners were guided by fires built on hilltops. Since elevating the fire would improve the visibility, placing the fire on a platform became a practice that led to the development of the lighthouse. In antiquity, the lighthouse functioned more as an entrance marker to ports than as a warning signal for reefs and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Historic Sites In Ontario
This is a list of National Historic Sites of Canada, National Historic Sites (french: Lieux historiques nationaux) in the Provinces and territories of Canada, province of Ontario. As of July 2021, there were 274 sites designated in Ontario, 39 of which are administered by Parks Canada (identified below and on the cluster pages listed below by the beaver icon . Of all provinces and territories, Ontario has the greatest number of National Historic Sites, and the largest number under Parks Canada administration, with a dense concentration in southern Ontario. The five largest clusters are listed separately: ::· List of National Historic Sites of Canada in Hamilton, Ontario, List of National Historic Sites in Hamilton ::· List of National Historic Sites of Canada in Kingston, Ontario, List of National Historic Sites in Kingston ::· List of National Historic Sites of Canada in Niagara Region, List of National Historic Sites in Niagara Region ::· List of National Historic Sites of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lighthouses In Ontario
A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways. Lighthouses mark dangerous coastlines, hazardous shoals, reefs, rocks, and safe entries to harbors; they also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and has become uneconomical since the advent of much cheaper, more sophisticated and effective electronic navigational systems. History Ancient lighthouses Before the development of clearly defined ports, mariners were guided by fires built on hilltops. Since elevating the fire would improve the visibility, placing the fire on a platform became a practice that led to the development of the lighthouse. In antiquity, the lighthouse functioned more as an entrance marker to ports than as a warning signal for reefs and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lighthouses Completed In 1859
A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways. Lighthouses mark dangerous coastlines, hazardous shoals, reefs, rocks, and safe entries to harbors; they also assist in aerial navigation. Once widely used, the number of operational lighthouses has declined due to the expense of maintenance and has become uneconomical since the advent of much cheaper, more sophisticated and effective electronic navigational systems. History Ancient lighthouses Before the development of clearly defined ports, mariners were guided by fires built on hilltops. Since elevating the fire would improve the visibility, placing the fire on a platform became a practice that led to the development of the lighthouse. In antiquity, the lighthouse functioned more as an entrance marker to ports than as a warning signal for reefs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of Lighthouses In Canada
The history of lighthouses in Canada dates back to 1734. The 18th century The first lighthouse in what was to become Canada, (the second on the entire coast of North America after Little Brewster Island in Boston Harbour which was built in 1716), went into service at the French fortress of Louisbourg on Cape Breton Island in 1734. Louisbourg Lighthouse is one of the most famous light houses in Canada. Patterned after the :fr:Phare des Baleines built off La Rochelle in 1682, the Louisbourg Light was destroyed by British troops during the siege of 1758, and not rebuilt until 1842; the rubble of the original tower is still visible at the base of the current lighthouse, which dates from 1923. Next came the Sambro Island Light in 1760. Located at the entrance to Halifax harbor, it has been upgraded over the years but remains the oldest continuously operating lighthouse in North America, predating New Jersey's Sandy Hook Light by 4 years, and such venerable lighthouses as Virginia's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
:Category:Lighthouses On The National Historic Sites Of Canada Register
{{commonscat, Lighthouses designated as National Historic Sites of Canada Lighthouses designated as National Historic Sites of Canada National Historic Sites of Canada (french: Lieux historiques nationaux du Canada) are places that have been designated by the federal Minister of the Environment on the advice of the Historic Sites and Monuments Board of Canada (HSMBC), as being .... Buildings and structures on the National Historic Sites of Canada register National Historic Sites * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Lighthouses In Canada
This is a list of lighthouses in Canada. These may naturally be divided into lighthouses on the Pacific coast, on the Arctic Ocean, in the Hudson Bay watershed, on the Labrador Sea and Gulf of St. Lawrence, in the St. Lawrence River watershed (including the Great Lakes), and on the Atlantic seaboard. British Columbia *Active Pass Lighthouse *Addenbroke Island Lightstation *Amphitrite Point Lighthouse *Boat Bluff lighthouse *Bonilla Island Lightstation *Brockton Point Lightstation *Cape Beale Lightstation *Cape Mudge Lighthouse *Cape Scott Lighthouse *Carmanah Point Light Station *Chatham Point lighthouse *Chrome Island Lightstation *Discovery Island Light *Dryad Point Lighthouse *Egg Island Lightstation *Entrance Island (British Columbia), Entrance Island Lightstation *Estevan Point Lighthouse *Fisgard Lighthouse, the oldest lighthouse on the West Coast of Canada. *Gallows Point Light *Green Island Lightstation *Holland Rock Lightstation *Ivory Island Lightstation *Kains Islan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Lighthouses In Ontario
This is a list of lighthouses in the province of Ontario, Canada. Lighthouses See also * List of lighthouses in Canada * Imperial Towers (a group of lighthouses in the list) References External links * {{Lighthouses of Canada Lists of lighthouses in Canada, Ontario Lighthouses in Ontario, * Lists of buildings and structures in Ontario, Lighthouses ... [...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] |
Canadian Coast Guard
The Canadian Coast Guard (CCG; french: links=no, Garde côtière canadienne, GCC) is the coast guard of Canada. Formed in 1962, the coast guard is tasked with marine search and rescue (SAR), communication, navigation, and transportation issues in Canadian waters, such as navigation aids and icebreaking, marine pollution response, and support for other Canadian government initiatives. The coast guard operates 119 vessels of varying sizes and 23 helicopters, along with a variety of smaller craft. The CCG is headquartered in Ottawa, Ontario, and is a special operating agency within Fisheries and Oceans Canada (Department of Fisheries and Oceans). Role and responsibility Unlike armed coast guards of some other nations, the CCG is a government marine organization without naval or law enforcement responsibilities. Naval operations in Canada's maritime environment are exclusively the responsibility of the Royal Canadian Navy. Enforcement of Canada's maritime-related federal statutes ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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