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Medium Clipper
A medium clipper is a type of clipper designed for both cargo carrying capacity and speed. An evolutionary adaptation of the extreme clipper, the medium clipper had been invented by 1851, when the hull type appeared in U.S. shipyards. Medium clippers continued to be built until 1873, when ''Pilgrim'', one of the last known medium clipper ships to be built, was launched by Joshua T. Foster from the shipyards of Medford, Massachusetts. Innovation The 1850s saw two major gold rushes in the English-speaking world—in Australia and Nevada—as well as continued development of placer gold mining in the Sierra Nevada mountains of California. As these precious metal mining activities matured, the working populations of the affected gold and silver mining belts began to demand large quantities of manufactured goods. Shippers began to look for a ship design that would speed large quantities of boxed, barrelled, or crated cargo to Melbourne or San Francisco. At the beginning of the 1850 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clipper
A clipper was a type of mid-19th-century merchant sailing vessel, designed for speed. Clippers were generally narrow for their length, small by later 19th century standards, could carry limited bulk freight, and had a large total sail area. "Clipper" does not refer to a specific sailplan; clippers may be schooners, brigs, brigantines, etc., as well as full-rigged ships. Clippers were mostly constructed in British and American shipyards, although France, Brazil, the Netherlands and other nations also produced some. Clippers sailed all over the world, primarily on the trade routes between the United Kingdom and China, in transatlantic trade, and on the New York-to-San Francisco route around Cape Horn during the California Gold Rush. Dutch clippers were built beginning in the 1850s for the tea trade and passenger service to Java. The boom years of the clipper era began in 1843 in response to a growing demand for faster delivery of tea from China. This continued under the stim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buoyancy
Buoyancy (), or upthrust, is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus the pressure at the bottom of a column of fluid is greater than at the top of the column. Similarly, the pressure at the bottom of an object submerged in a fluid is greater than at the top of the object. The pressure difference results in a net upward force on the object. The magnitude of the force is proportional to the pressure difference, and (as explained by Archimedes' principle) is equivalent to the weight of the fluid that would otherwise occupy the submerged volume of the object, i.e. the displaced fluid. For this reason, an object whose average density is greater than that of the fluid in which it is submerged tends to sink. If the object is less dense than the liquid, the force can keep the object afloat. This can occur only in a no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hogging And Sagging
In solid mechanics, structural engineering, and shipbuilding, hogging and sagging describe the shape that a beam or similar long object will deform into when loading is applied. ''Hogging'' describes a beam that curves upwards in the middle, and ''sagging'' describes a beam that curves downwards. Ships Dynamic stress Hogging is the stress a ship's hull or keel experiences that causes the center or the keel to bend upward. Sagging is the stress a ship's hull or keel is placed under when a wave is the same length as the ship and the ship is in the trough of two waves. This causes the middle of the ship to bend down slightly, and depending on the level of bend, may cause the hull to snap or crack. Sagging or dynamic hogging may have been what sank the ''Prestige'' off Spain on 19 November 2002. The 2013 loss of container ship ''MOL Comfort'' off the coast of Yemen was attributed to hogging. Subsequent lawsuits blamed the shipbuilder for design flaws. Time-induced stress Hogging, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wrought Iron
Wrought iron is an iron alloy with a very low carbon content (less than 0.08%) in contrast to that of cast iron (2.1% to 4%). It is a semi-fused mass of iron with fibrous slag Inclusion (mineral), inclusions (up to 2% by weight), which give it a wood-like "grain" that is visible when it is etched, rusted, or bent to structural failure, failure. Wrought iron is tough, malleable, ductile, corrosion resistant, and easily forge welding, forge welded, but is more difficult to welding, weld electrically. Before the development of effective methods of steelmaking and the availability of large quantities of steel, wrought iron was the most common form of malleable iron. It was given the name ''wrought'' because it was hammered, rolled, or otherwise worked while hot enough to expel molten slag. The modern functional equivalent of wrought iron is Carbon steel#Mild or low-carbon steel, mild steel, also called low-carbon steel. Neither wrought iron nor mild steel contain enough carbon to be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Composite Ship
The technique of composite ship construction (wooden planking over a wrought iron frame) emerged in the mid-19th century as the final stage in the evolution of fast commercial sailing ships. Construction of wrought iron hulled vessels had begun in the 1820s and was a mature technology by the time of the launch of the SS ''Great Britain'' in 1843. However, iron hulls could not be sheathed with copper alloy (due to bimetallic corrosion) and so would become festooned with drag-inducing weed during long voyages in the tropics. The wooden planking of a composite ship allowed the copper sheathing essential for fast ocean crossings under sail while the iron frame made the ship relatively immune from hogging and sagging, and took up less interior space than wooden framing. The brief reign of composite clippers as the fastest mode of transport between Europe and Asia was brought to a close by the opening of the Suez Canal in 1869 and ongoing improvement in the performance of steam ship ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steamship
A steamship, often referred to as a steamer, is a type of steam-powered vessel, typically ocean-faring and seaworthy, that is propelled by one or more steam engines that typically move (turn) propellers or paddlewheels. The first steamships came into practical usage during the early 1800s; however, there were exceptions that came before. Steamships usually use the prefix designations of "PS" for ''paddle steamer'' or "SS" for ''screw steamer'' (using a propeller or screw). As paddle steamers became less common, "SS" is assumed by many to stand for "steamship". Ships powered by internal combustion engines use a prefix such as "MV" for ''motor vessel'', so it is not correct to use "SS" for most modern vessels. As steamships were less dependent on wind patterns, new trade routes opened up. The steamship has been described as a "major driver of the first wave of trade globalization (1870–1913)" and contributor to "an increase in international trade that was unprecedented in hu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fuelling Station
Fuelling stations, also known as coaling stations, are repositories of fuel (initially coal and later oil) that have been located to service commercial and naval vessels. Today, the term "coaling station" can also refer to coal storage and feeding units in fossil-fuel power stations. History Initially named a '' coaling station'' due to the use of coal for steam generation a fuelling station was built for the purpose of replenishing coal supplies for ships or railway locomotives. The term is often associated with 19th and early 20th century seaports associated with blue water navies, who used coaling stations as a means of extending the range of warships. In the late 19th century steamships powered by coal began to replace sailing ships as the principal means of propulsion for ocean transport. Fueling stations transitioned to oil as boilers moved from being coal-fired to oil- or hybrid oil-and-coal-firing, coal being completely replaced as steam engines gave way to internal com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clipper Bow
The bow () is the forward part of the hull of a ship or boat, the point that is usually most forward when the vessel is underway. The aft end of the boat is the stern. Prow may be used as a synonym for bow or it may mean the forward-most part of the bow above the waterline. Function A ship's bow should be designed to enable the hull to pass efficiently through the water. Bow shapes vary according to the speed of the boat, the seas or waterways being navigated, and the vessel's function. Where sea conditions are likely to promote pitching, it is useful if the bow provides reserve buoyancy; a flared bow (a raked stem with flared topsides) is ideal to reduce the amount of water shipped over the bow. Ideally, the bow should reduce the resistance and should be tall enough to prevent water from regularly washing over the top of it. Large commercial barges on inland waterways rarely meet big waves and may have remarkably little freeboard at the bow, whereas fast military ve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Donald McKay
Donald McKay (September 4, 1810 – September 20, 1880) was a Canadian-born American designer and builder of sailing ships, famed for his record-setting clippers. Early life He was born in Jordan Falls, Shelburne County, on Nova Scotia's South Shore. He was the oldest son and one of eighteen children of Hugh McKay, a fisherman and a farmer, and Ann McPherson McKay. Both of his parents were of Scottish descent. He was named after his grandfather, Captain Donald McKay, a British officer, who after the Revolutionary war moved to Nova Scotia from the Scottish Highlands. Early years as a shipbuilder In 1826 McKay moved to New York, working for shipbuilders Brown & Bell and was an apprentice of Isaac Webb from 1827 to 1831. After 1832 he did some freelance jobs for Webb and Smith & Dimon. McKay also freelanced for Brown & Bell at their Wescasset's shipyard. In 1840 at Newburyport, he was contracted to finish ''Delia Walker'', 427 tons, for John Currier, Jr. Currier was very ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antelope Of Boston
''Antelope'' was a medium clipper built in 1851 in Medford, near Boston, Massachusetts. She sailed in the San Francisco, China, and Far East trades, and was known for her fine finish work and for her crew's escape from pirates. She is often called ''Antelope of Boston'' to distinguish her from an extreme clipper launched in 1852, ''Antelope of New York''. Construction ''Antelope'' was designed "to combine large stowage capacity with good sailing qualities." Her frame was white oak, with yellow pine planking and a rock maple keel. The hull was black, the inside dark buff with blue waterways. Her cabin was "beautifully panelled with satin and zebra woods, set off with rose wood pilasters." The "Boston Daily Atlas" praised ''Antelope''’s ornamental work as "infinitely superior to most of the gaudy stuff now in vogue." Voyages ''Antelope'' sailed from Boston to San Francisco on her maiden voyage in 149 days, rather than the expected 130 days or less, under the well known Ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California Gold Rush
The California Gold Rush (1848–1855) was a gold rush that began on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill in Coloma, California. The news of gold brought approximately 300,000 people to California from the rest of the United States and abroad. The sudden influx of gold into the money supply reinvigorated the American economy; the sudden population increase allowed California to go rapidly to statehood, in the Compromise of 1850. The Gold Rush had severe effects on Native Californians and accelerated the Native American population's decline from disease, starvation and the California genocide. The effects of the Gold Rush were substantial. Whole indigenous societies were attacked and pushed off their lands by the gold-seekers, called "forty-niners" (referring to 1849, the peak year for Gold Rush immigration). Outside of California, the first to arrive were from Oregon, the Sandwich Islands (Hawaii) and Latin America in late 1848. Of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extreme Clipper
An extreme clipper was a clipper designed to sacrifice cargo capacity for speed. They had a bow lengthened above the water, a drawing out and sharpening of the forward body, and the greatest breadth further aft. In the United States, extreme clippers were built in the period 1845 to 1855. British-built extreme clippers include vessels built over the period 1854 to 1870 (''Annandale'' to e.g. '' Norman Court''). The first extreme clipper Arthur H. Clark, in his 1910 book ''The Clipper Ship Era'', explains the history leading up to the construction of the first extreme clipper: Medium and extreme clippers From 1851 or earlier another type of clipper ship was also being built, the medium clipper. In the mid-1800s, shipbuilders in Medford, Massachusetts began building what would become the medium clipper ship. They "quietly evolved a new type (of ship) of about 450 tons burden which, handled by eighteen officers and men, would carry half as much freight as a British-Indianman ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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