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Grasshopper Beam Engine
Grasshopper beam engines are beam engines that are pivoted at one end, rather than in the centre. Usually the connecting rod to the crankshaft is placed ''between'' the piston and the beam's pivot. That is, they use a second-class lever, rather than the usual first-class lever. Origins The first recorded example of a grasshopper beam was William Murdoch's model steam carriage of 1784. The beam offered negligible mechanical advantage and appears to have been used primarily instead of a crosshead, for what was effectively a return connecting rod engine. The American engineer Oliver Evans drew a high-pressure marine grasshopper engine in 1801,A concept similar to Trevithick's high-pressure locomotive of the same period. and in 1805 built the '' Oruktor Amphibolos'', an amphibious dredger. Almost all grasshopper engines placed the crankshaft between the piston and the beam's pivot. This allows a long stroke for the piston, with a shorter stroke for the crank, although with greater ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evans "Grasshopper" Linkage
Evans may refer to: People *Evans (surname) *List of people with surname Evans Places United States *Evans Island, an island of Alaska *Evans, Colorado *Evans, Georgia *Evans County, Georgia *Evans, New York *Evans Mills, New York *Evans City, Pennsylvania *Evans, West Virginia Elsewhere *Évans, in France *Cape Evans, in Antarctica Creeks *Evans Creek (Peters Creek), a tributary of Peters Creek in California * Evans Creek (Tuscarawas River), a stream in Ohio *Evans Creek (Devils River), a stream in Texas Businesses and organizations *Robert B. Evans, founder of Evans Industries *Evans (retailer), of the United Kingdom *Evans Cycles, a United Kingdom bicycle retailer *Bob Evans Restaurants, a chain operated by Bob Evans Farms, Inc. of the United States *H. C. Evans, a defunct manufacturer of casino, amusement park and fairground equipment in the United States *D'Addario (manufacturer), a drumhead manufacturer also known as "Evans" Transportation *Evans station (Muni Metro) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stationary Engine
A stationary engine is an engine whose framework does not move. They are used to drive immobile equipment, such as pumps, generators, mills or factory machinery, or cable cars. The term usually refers to large immobile reciprocating engines, principally stationary steam engines and, to some extent, stationary internal combustion engines. Other large immobile power sources, such as steam turbines, gas turbines, and large electric motors, are categorized separately. Stationary engines were once widespread in the era when each factory or mill generated its own power, and power transmission was mechanical (via line shafts, belts, gear trains, and clutches). Applications for stationary engines have declined since electrification has become widespread; most industrial uses today draw electricity from an electrical grid and distribute it to various individual electric motors instead. Engines that operate in one place, but can be moved to another place for later operation, are calle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southwark
Southwark ( ) is a district of Central London situated on the south bank of the River Thames, forming the north-western part of the wider modern London Borough of Southwark. The district, which is the oldest part of South London, developed due to its position at the southern end of the early versions of London Bridge, the only crossing point for many miles. London's historic core, the City of London, lay north of the Bridge and for centuries the area of Southwark just south of the bridge was partially governed by the city. By the 12th century Southwark had been incorporated as an ancient borough, and this historic status is reflected in the alternative name of the area, as Borough. The ancient borough of Southwark's river frontage extended from the modern borough boundary, just to the west of by the Oxo Tower, to St Saviour's Dock (originally the mouth of the River Neckinger) in the east. In the 16th century, parts of Southwark became a formal City ward, Bridge Without. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Easton & Amos
Easton may refer to: Places Canada * Easton, Nova Scotia United Kingdom *Easton, Bristol *Easton, Cambridgeshire * Easton, Dorset *Great Easton, Essex and Little Easton, Essex * Easton, Hampshire **Crux Easton, Hampshire *Easton, Isle of Wight * Great Easton, Leicestershire *Easton, Lincolnshire *Easton, Norfolk *Easton Maudit, Northamptonshire *Easton Neston, Northamptonshire *Easton on the Hill, Northamptonshire * Easton, Somerset, near Wells *Easton in Gordano, Somerset *Easton, Suffolk *Easton Bavents, Suffolk *In the county of Wiltshire: **Easton, Bishops Cannings, Wiltshire, near Devizes ** Easton, Corsham, Wiltshire ** Easton, Pewsey Vale, a parish ***Easton Royal, village in the parish **Easton Grey, between Malmesbury and Sherston **Easton Town, Wiltshire, near Sherston United States *Easton, California *Easton, Connecticut *Easton, Georgia, a former town located in what is now Atlanta *Easton, Illinois *Easton, Kansas *Easton, Maine *Easton, Maryland *Easton, Massachuse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parallel Motion
In kinematics, the parallel motion linkage is a six-bar mechanical linkage invented by the Scottish engineer James Watt in 1784 for the double-acting Watt steam engine. It allows a rod moving practically straight up and down to transmit motion to a beam moving in an arc, without putting significant sideways strain on the rod. Description In previous engines built by Newcomen and Watt, the piston pulled one end of the walking beam downwards during the power stroke using a chain, and the weight of the pump pulled the other end of the beam downwards during the recovery stroke using a second chain, the alternating forces producing the rocking motion of the beam. In Watt's new double-acting engine, the piston produced power on both the upward and downward strokes, so a chain could not be used to transmit the force to the beam. Watt designed the parallel motion to transmit force in both directions whilst keeping the piston rod very close to vertical. He called it "parallel motion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crankpin
A crankpin or crank pin, also known as a rod bearing journal, is a mechanical device in an engine which connects the crankshaft to the connecting rod for each cylinder. It has a cylindrical surface, to allow the crankpin to rotate relative to the "big end" of the connecting rod. The most common configuration is for a crankpin to serve one cylinder. However, many V engines have each crankpin shared by each pair of cylinders. Design The crankpin connects to the larger end of the connecting rod for each cylinder. This end of the connecting rod is called the "big end", as opposed to the "small end" or "little end" (which connects to the wrist/gudgeon pin in the piston). The bearing which allows the crankpin to rotate around its shaft is called the "rod bearing". In automotive engines, the most common type of rod bearing is the plain bearing, however Bushing (bearing), bushings or roller bearings are also used in some engines. Configurations In a single-cylinder engine, strai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
House-built Engine
A house-built engine is a stationary steam engine that is built into an engine house, such that it uses the masonry of the engine house as an integral part of the support of the engine. Beam engines Most house-built engines were early beam engines. A 'bob wall' in the engine house supported the pivot axle of the beam or 'bob'. This wall could be an internal wall, with both ends of the beam inside the house, but it was commonly the end wall of the house and so the beam projected to the outside. For a heavy beam, the bob wall was required to be extremely substantial. Early engines were used for pumping mines or wells, so as well as the weight of the beam, the house had to also support the weight of the long pump rod, reaching down to the depths of the mine. Beam engines appeared during the 18th century. The only technologies at this time that could support the weight of an engine's beam were masonry and timber-framing, as the work of either shipwrights or millwrights. Cast iro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Bell (engineer)
Henry Bell (7 April 1767 – 14 March 1830) was a Scottish engineer who helped to pioneer the development of the steamship. He is mostly widely known for introducing the first successful passenger steamboat service in Europe in 1812. Early career Bell was born at Torphichen, near Bathgate, West Lothian in 1767. He was the fifth son of Patrick Bell and Margaret Easton, themselves members of a family well known at the time as millwrights, builders and engineers. He grew up at the local mill in Torphichen, where developed a working knowledge of water power. Work carried out by members of the Bell family included the design and construction of harbours, bridges, etc., in Scotland and throughout the United Kingdom. Henry Bell was educated at the local parish school and was apprenticed to a stonemason between 1780 and 1783. Three years later, he was briefly apprenticed to his uncle, a millwright. In 1786, he went to work Borrowstounness and learned ship modelling. In 1787, h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centre Of Gravity
In physics, the center of mass of a distribution of mass in space (sometimes referred to as the balance point) is the unique point where the weighted relative position of the distributed mass sums to zero. This is the point to which a force may be applied to cause a linear acceleration without an angular acceleration. Calculations in mechanics are often simplified when formulated with respect to the center of mass. It is a hypothetical point where the entire mass of an object may be assumed to be concentrated to visualise its motion. In other words, the center of mass is the particle equivalent of a given object for application of Newton's laws of motion. In the case of a single rigid body, the center of mass is fixed in relation to the body, and if the body has uniform density, it will be located at the centroid. The center of mass may be located outside the physical body, as is sometimes the case for hollow or open-shaped objects, such as a horseshoe. In the case of a distri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine Steam Engine
A marine steam engine is a steam engine that is used to power a ship or boat. This article deals mainly with marine steam engines of the reciprocating type, which were in use from the inception of the steamboat in the early 19th century to their last years of large-scale manufacture during World War II. Reciprocating steam engines were progressively replaced in marine applications during the 20th century by steam turbines and marine diesel engines. History The first commercially successful steam engine was developed by Thomas Newcomen in 1712. The steam engine improvements brought forth by James Watt in the later half of the 18th century greatly improved steam engine efficiency and allowed more compact engine arrangements. Successful adaptation of the steam engine to marine applications in England would have to wait until almost a century after Newcomen, when Scottish engineer William Symington built the world's "first practical steamboat", the '' Charlotte Dundas'', in 1802. Ri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steamboat
A steamboat is a boat that is marine propulsion, propelled primarily by marine steam engine, steam power, typically driving propellers or Paddle steamer, paddlewheels. Steamboats sometimes use the ship prefix, prefix designation SS, S.S. or S/S (for 'Screw Steamer') or PS (for 'Paddle Steamer'); however, these designations are most often used for steamships. The term ''steamboat'' is used to refer to smaller, insular, steam-powered boats working on lakes and rivers, particularly riverboats. As using steam became more reliable, steam power became applied to larger, ocean-going vessels. Background Limitations of the Newcomen steam engine Early steamboat designs used Newcomen atmospheric engine, Newcomen steam engines. These engines were large, heavy, and produced little power, which resulted in an unfavorable power-to-weight ratio. The Newcomen engine also produced a reciprocating or rocking motion because it was designed for pumping. The piston stroke was caused by a water jet i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paddle Steamer
A paddle steamer is a steamship or steamboat powered by a steam engine that drives paddle wheels to propel the craft through the water. In antiquity, paddle wheelers followed the development of poles, oars and sails, where the first uses were wheelers driven by animals or humans. In the early 19th century, paddle wheels were the predominant way of propulsion for steam-powered boats. In the late 19th century, paddle propulsion was largely superseded by the screw propeller and other marine propulsion systems that have a higher efficiency, especially in rough or open water. Paddle wheels continue to be used by small, pedal-powered paddle boats and by some ships that operate tourist voyages. The latter are often powered by diesel engines. Paddle wheels The paddle wheel is a large steel framework wheel. The outer edge of the wheel is fitted with numerous, regularly spaced paddle blades (called floats or buckets). The bottom quarter or so of the wheel travels under water. An e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
