|
Point Blunt Light
Point Blunt Light is a lighthouse on Angel Island in San Francisco Bay, California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m .... History Point Blunt Lighthouse was established in 1915. The lighthouse was automated in 1976. From Coast Guard web site in 1970, before the lighthouse was automated: Point Blunt Light was originally maintained by personnel at Angel Island Light Station at Point Knox until 1960. In 1960 a new watch room was constructed at Point Blunt which afforded a view of the entire San Francisco Bay. With the new watch room and new quarters completed in 1961 at Point Blunt, the Coast Guard moved the personnel from Angel Island Light Station. Personnel at Point Blunt operate their own light and fog signals. The station also provides special direction finder ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angel Island (California)
Angel Island is an island in San Francisco Bay. The entire island is included within Angel Island State Park, administered by California State Parks. The island, a California Historical Landmark, has been used by humans for a variety of purposes, including seasonal hunting and gathering by indigenous peoples, water and timber supply for European ships, ranching by Mexicans, United States military installations, a United States Public Health Service Quarantine Station, and a U.S. Bureau of Immigration inspection and detention facility. The Angel Island Immigration Station, on the northeast corner of the island, which has been designated a National Historic Landmark, was where officials detained, inspected, and examined approximately one million immigrants, who primarily came from Asia. Under the Chinese Exclusion Act of 1882, the first United States law to restrict a group of immigrants based on their race, nationality, and class, all arriving Chinese immigrants were to be examined ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Francisco Bay
San Francisco Bay is a large tidal estuary in the U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the big cities of San Francisco, San Jose, and Oakland. San Francisco Bay drains water from approximately 40 percent of California. Water from the Sacramento and San Joaquin rivers, and from the Sierra Nevada mountains, flow into Suisun Bay, which then travels through the Carquinez Strait to meet with the Napa River at the entrance to San Pablo Bay, which connects at its south end to San Francisco Bay. It then connects to the Pacific Ocean via the Golden Gate strait. However, this entire group of interconnected bays is often called the ''San Francisco Bay''. The bay was designated a Ramsar Wetland of International Importance on February 2, 2017. Size The bay covers somewhere between , depending on which sub-bays (such as San Pablo Bay), estuaries, wetlands, and so on are included in the measurement. The main part of the bay meas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California
California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territories of the United States by population, most populous U.S. state and the List of U.S. states and territories by area, 3rd largest by area. It is also the most populated Administrative division, subnational entity in North America and the 34th most populous in the world. The Greater Los Angeles area and the San Francisco Bay Area are the nation's second and fifth most populous Statistical area (United States), urban regions respectively, with the former having more than 18.7million residents and the latter having over 9.6million. Sacramento, California, Sacramento is the state's capital, while Los Angeles is the List of largest California cities by population, most populous city in the state and the List of United States cities by population, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fresnel Lens
A Fresnel lens ( ; ; or ) is a type of composite compact lens developed by the French physicist Augustin-Jean Fresnel (1788–1827) for use in lighthouses. It has been called "the invention that saved a million ships." The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional design. A Fresnel lens can be made much thinner than a comparable conventional lens, in some cases taking the form of a flat sheet. The simpler dioptric (purely refractive) form of the lens was first proposed by Count Buffon and independently reinvented by Fresnel. The ''catadioptric'' form of the lens, entirely invented by Fresnel, has outer elements that use total internal reflection as well as refraction; it can capture more oblique light from a light source and add it to the beam of a lighthouse, making the light visible from greater distances. Description The Fresnel lens redu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lighthouse
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 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Point Blunt Light
Point Blunt Light is a lighthouse on Angel Island in San Francisco Bay, California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m .... History Point Blunt Lighthouse was established in 1915. The lighthouse was automated in 1976. From Coast Guard web site in 1970, before the lighthouse was automated: Point Blunt Light was originally maintained by personnel at Angel Island Light Station at Point Knox until 1960. In 1960 a new watch room was constructed at Point Blunt which afforded a view of the entire San Francisco Bay. With the new watch room and new quarters completed in 1961 at Point Blunt, the Coast Guard moved the personnel from Angel Island Light Station. Personnel at Point Blunt operate their own light and fog signals. The station also provides special direction finder ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boatswain's Mate (United States Coast Guard)
The boatswain's mate is a position in the United States Coast Guard. A boatswain's mate is a versatile role, with those holding the role expected to be capable of nearly any job in a Coast Guard vessel. The tasks include deck maintenance, navigation duties, and navigation. They can also take the helm of a ship when needed. Types of Duty BMs can be found in nearly every duty station available throughout the United States and various locations overseas. They serve on every Coast Guard Cutter, from harbor tugs to sea-going icebreakers. They work in navigation, small boat operations, deck operations, crane and pulley systems, search and rescue, deck maintenance, and small arms. Additionally, in many assignments BMs act as boarding team members (BTM) or boarding officers (BO). BMs are Officers in Charge of patrol boats, tugs, small craft, and small shore units including search and rescue stations and aids to navigation teams. BMs use their leadership and expertise to perform the missi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Duty Officer
A duty officer or officer of the day is a position that is assigned to a worker on a regularly rotational basis. While on duty, duty officers attend to administrative tasks and incidents that require attention regardless of the time of day, in addition to the officer's normal duties. A duty officer is typically assigned to work for a period of time such as 24 to 48 hours, after which he will be relieved by the next duty officer listed on a roster. The outgoing duty officer will turn over relevant data and documentation to the incoming duty officer about the previous day's happenings before returning to his normal duties or resting. Military usage In the military, the responsibilities of a duty officer vary depending on the position. Military units may have duty officers that are responsible for the military unit and act as the commanding officer's representative. Certain departments may have duty officers that handle tasks specific to that department after regular working hours. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Engineman
Engineman (abbreviated as EN) is a United States Navy occupational rating. Engineman was the former name for the current U.S. Coast Guard rating of Machinery Technician. History Enginemen operate, service and repair internal combustion engines used to power some of the Navy's ships and most of the Navy's small craft. Most Enginemen work with diesel engines. Enginemen also operate and maintain electrohydraulic controllable-pitch propeller systems and steering engines, refrigeration and air conditioning systems, air compressors, desalinization plants and small auxiliary boilers. *aligning fuel, water and air piping systems and controlling operation of diesel engines used for ship and small craft propulsion, and to generate electrical power; *cleaning, lubricating, adjusting, testing and performing other preventive maintenance on diesel engines, reduction gears, air compressors, hydraulic or pneumatic clutches, steering engines and controllable-pitch propeller systems; *operating a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seaman (rank)
Seaman is a military rank used in many Navy, navies around the world. It is considered a junior enlisted rank and, depending on the navy, it may be a single rank on its own or a name shared by several similarly junior ranks. In the Commonwealth of Nations, Commonwealth, it is the lowest rank in the navy, while in the United States, it refers to the three lowest ranks of the United States Navy, U.S. Navy and United States Coast Guard, U.S. Coast Guard. The equivalent of the seaman is the ''matelot'' in French-speaking countries, and ''Matrose'' in German-speaking countries. Australia The Royal Australian Navy features one seaman rank, which is split into two distinct classes. Seaman and seaman* (pronounced "seaman star"), to differentiate between those who have completed their employment training and those who are in training. There is no insignia on a seaman rank slide. Canada There are 4 grades of sailor (previously the term "seaman", until it was replaced with "sailor" in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exclave
An enclave is a territory (or a small territory apart of a larger one) that is entirely surrounded by the territory of one other state or entity. Enclaves may also exist within territorial waters. ''Enclave'' is sometimes used improperly to denote a territory that is only partly surrounded by another state. The Vatican City and San Marino, both enclaved by Italy, and Lesotho, enclaved by South Africa, are completely enclaved sovereign states. An exclave is a portion of a state or district geographically separated from the main part by surrounding alien territory (of one or more states or districts etc). Many exclaves are also enclaves, but not all: an exclave can be surrounded by the territory of more than one state. The Azerbaijani exclave of Nakhchivan is an example of an exclave that is not an enclave, as it borders Armenia, Turkey and Iran. Semi-enclaves and semi-exclaves are areas that, except for possessing an unsurrounded sea border (a coastline contiguous with internati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
