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Seven Foot Knoll Light
The Seven Foot Knoll Light was built in 1855 and is the oldest screw-pile lighthouse in Maryland. It was located atop Seven Foot Knoll in the Chesapeake Bay until it was replaced by a modern navigational aid and relocated to Baltimore's Inner Harbor as a museum exhibit. Location It was initially installed on a rocky shoal called Seven Foot Knoll (at ), in the mouth of the Patapsco River. The northern tidal reach of this river is the Baltimore Harbor, where the now-decommissioned lighthouse has been placed as a museum exhibit. In 1997 the lighthouse was transferred to the Baltimore Maritime Museum (now the Historic Ships in Baltimore museum) and is permanently installed at the south end of Pier 5. Construction Constructed of rolled iron, the lighthouse consists of three main sections. The gallery deck was located above the average high tide waters. The house was the second section, sitting directly atop the gallery deck. This is where the keeper and his family would liv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patapsco River
The Patapsco River mainstem is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map , accessed April 1, 2011 river in central Maryland that flows into the Chesapeake Bay. The river's tidal portion forms the harbor for the city of Baltimore. With its South Branch, the Patapsco forms the northern border of Howard County, Maryland. The name "Patapsco" is derived from the Algonquian ''pota-psk-ut'', which translates to "backwater" or "tide covered with froth." History Captain John Smith was the first European to explore the river noting it on his 1612 map as the Bolus River. The "Red river", was named after the clay color, and is considered the "old Bolus", as other branches were also labeled Bolus on maps. As the river was not navigable beyond Elkridge, it was not a major path of commerce with only one ship listed as serving the northern branch, and four others operating around the mouth in 1723. The Patapsco River is referre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Foundry
A foundry is a factory that produces metal castings. Metals are cast into shapes by melting them into a liquid, pouring the metal into a mold, and removing the mold material after the metal has solidified as it cools. The most common metals processed are aluminum and cast iron. However, other metals, such as bronze, brass, steel, magnesium, and zinc, are also used to produce castings in foundries. In this process, parts of desired shapes and sizes can be formed. Foundries are one of the largest contributors to the manufacturing recycling movement, melting and recasting millions of tons of scrap metal every year to create new durable goods. Moreover, many foundries use sand in their molding process. These foundries often use, recondition, and reuse sand, which is another form of recycling. Process In metalworking, casting involves pouring liquid metal into a mold, which contains a hollow cavity of the desired shape, and then allowing it to cool and solidify. The solidified pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Lighthouse Service
The United States Lighthouse Service, also known as the Bureau of Lighthouses, was the agency of the United States Government and the general lighthouse authority for the United States from the time of its creation in 1910 as the successor of the United States Lighthouse Board until 1939 when it was merged into the United States Coast Guard. It was responsible for the upkeep and maintenance of all lighthouses and lightvessels in the United States. History 1789–1910 In 1789, the United States Lighthouse Establishment (USLHE) was created and operated under the Department of the Treasury. All U.S. lighthouse ownership was transferred to the government which became the general lighthouse authority (GLA). In 1792, the Cape Henry Lighthouse was the first lighthouse built by the USLHE. In 1822, French physicist, Augustin Fresnel designed the Fresnel lens. In 1841 the Fresnel lens was first used in the United States and installed on the Navesink Lighthouse. In 1852 the Lighthouse Bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glen Burnie, Maryland
Glen Burnie is an unincorporated town and census-designated place (CDP) in Anne Arundel County, Maryland, United States. It is a suburb of Baltimore. The population of Glen Burnie was 67,639 at the 2010 census. History In 1812, Elias Glenn, a district attorney, established a county seat near what is currently known as Brooklyn Park. He named his property "Glennsburne". The name was changed to "Glennsbourne Farm", and eventually "Glenburnie", as the property was passed through Glenn's descendants. Records also show the name as "Tracey's Station" and "Myrtle", after local postmaster Samuel Sewell Tracey and one of Tracey's boarders, before the final decision was made. In 1854, William Wilkins Glenn, Elias Glenn's grandson, incorporated the Curtis Creek Mining, Furnace and Manufacturing Company into his family's property. The business flourished during the 19th century, and with it came several thousand acres of land in northern Anne Arundel County. Upon the death of William Wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lifesaving Medal
The Gold Lifesaving Medal and Silver Lifesaving Medal are U.S. decorations issued by the United States Coast Guard. The awards were established by Act of Congress, 20 June 1874; later authorized by . These decorations are two of the oldest medals in the United States and were originally established at the Department of Treasury as Lifesaving Medals First and Second Class. The Department of the Treasury initially gave the award, but today the United States Coast Guard awards it through the Department of Homeland Security. They are not classified as military decorations, and may be awarded to any person. Chapter 4 History A British Sea Gallantry Medal The Sea Gallantry Medal (SGM) (officially the 'Medal for Saving Life at Sea', and originally the ' Board of Trade Medal for Saving Life at Sea'), is a United Kingdom award for civil gallantry at sea. History The Merchant Shipping Act 1854 pr ... for saving life was authorized in 1854. Twenty years later in the United State ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gibson Island (Maryland)
Gibson Island is an island and unincorporated community on the western shore of the Chesapeake Bay. It is part of Anne Arundel County, Maryland, United States and is the eastern terminus of Maryland Route 177. It is connected by a causeway to Pasadena, Maryland. The two locations do not share a ZIP code. Gibson Island's history includes its use as a summer residence by Native Americans in the 17th century. Captain John Smith sailed past it in his voyage up the Chesapeake Bay in 1608. Land grants began issue around the 1680s. In the early 1900s, W. Stuart Symington, Jr. (1871–1926) bought the island's land (including three existing island farms) with his brother Thomas, to develop the island into a residential community. One of the early owners was a man named Gibson, after whom the island is named. The Symingtons, upon the advice of Edward H. Bouton, the developer of the Roland Park and Guilford neighborhoods in Baltimore, hired landscape architect Frederick Law Olmsted, J ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dredging
Dredging is the excavation of material from a water environment. Possible reasons for dredging include improving existing water features; reshaping land and water features to alter drainage, navigability, and commercial use; constructing dams, dikes, and other controls for streams and shorelines; and recovering valuable mineral deposits or marine life having commercial value. In all but a few situations the excavation is undertaken by a specialist floating plant, known as a dredger. Dredging is carried out in many different locations and for many different purposes, but the main objectives are usually to recover material of value or use, or to create a greater depth of water. Dredges have been classified as suction or mechanical. Dredging has significant environmental impacts: it can disturb marine sediments, leading to both short- and long-term water pollution, destroy important seabed ecosystems, and can release human-sourced toxins captured in the sediment. Description ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tugboat
A tugboat or tug is a marine vessel that manoeuvres other vessels by pushing or pulling them, with direct contact or a tow line. These boats typically tug ships in circumstances where they cannot or should not move under their own power, such as in crowded harbour or narrow canals, or cannot move at all, such as barges, disabled ships, log rafts, or oil platforms. Some are ocean-going, some are icebreakers or salvage tugs. Early models were powered by steam engines, long ago superseded by diesel engines. Many have deluge gun water jets, which help in firefighting, especially in harbours. Types Seagoing Seagoing tugs (deep-sea tugs or ocean tugboats) fall into four basic categories: #The standard seagoing tug with model bow that tows almost exclusively by way of a wire cable. In some rare cases, such as some USN fleet tugs, a synthetic rope hawser may be used for the tow in the belief that the line can be pulled aboard a disabled ship by the crew owing to its lightness ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Historic American Engineering Record
Heritage Documentation Programs (HDP) is a division of the U.S. National Park Service (NPS) responsible for administering the Historic American Buildings Survey (HABS), Historic American Engineering Record (HAER), and Historic American Landscapes Survey (HALS). These programs were established to document historic places in the United States. Records consist of measured drawings, archival photographs, and written reports, and are archived in the Prints and Photographs Division of the Library of Congress. Historic American Buildings Survey In 1933, NPS established the Historic American Buildings Survey following a proposal by Charles E. Peterson, a young landscape architect in the agency. It was founded as a constructive make-work program for architects, draftsmen and photographers left jobless by the Great Depression. It was supported through the Historic Sites Act of 1935. Guided by field instructions from Washington, D.C., the first HABS recorders were tasked with docume ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baltimore National Heritage Area
Baltimore National Heritage Area is a federally designated National Heritage Area encompassing portions of Baltimore, Maryland, USA. The designated area includes the central portion of the city, waterfront, inner neighborhoods and portions of the city's park system. The district includes Fort McHenry and the Inner Harbor, as well as portions of the Charles Street, Falls Road, National Historic Seaport and Star Spangled Banner Maryland Scenic Byways. The Baltimore National Heritage Area was established on March 30, 2009 by the Omnibus Public Land Management Act of 2009 (§7002). The designation recognizes the area's unique historic and cultural character, and is intended to stimulate economic development, tourism and historic preservation.Baltimore National Heritage Area: About Us Baltimore Heritage Area Association. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Register Of Historic Places
The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artistic value". A property listed in the National Register, or located within a National Register Historic District, may qualify for tax incentives derived from the total value of expenses incurred in preserving the property. The passage of the National Historic Preservation Act (NHPA) in 1966 established the National Register and the process for adding properties to it. Of the more than one and a half million properties on the National Register, 95,000 are listed individually. The remainder are contributing resources within historic districts. For most of its history, the National Register has been administered by the National Park Service (NPS), an agency within the U.S. Department of the Interior. Its goals are to help property owners and inte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Floating Sheerleg
A floating sheerleg (also: shearleg) is a floating water vessel with a crane built on shear legs. Unlike other types of crane vessel, it is not capable of rotating its crane independently of its hull. There is a huge variety in sheerleg capacity. The smaller cranes start at around 50 tons in lifting capacity, with the largest being able to lift 10,000 tons. The bigger sheerlegs usually have their own propulsion system and have a large accommodation facility on board, while smaller units are floating pontoons that need to be towed to their workplace by tugboats. Sheerlegs are commonly used for salvaging ships, assistance in shipbuilding Shipbuilding is the construction of ships and other floating vessels. It normally takes place in a specialized facility known as a shipyard. Shipbuilders, also called shipwrights, follow a specialized occupation that traces its roots to befor ..., loading and unloading large cargo into ships, and bridge building. They have grown conside ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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