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Steering Engine
A steering engine is a power steering device for ships. History The first steering engine with feedback was installed on Isambard Kingdom Brunel's ''Great Eastern'' in 1866. Designed by Scottish engineer John McFarlane Gray and built by George Forrester and Company, this was a steam-powered mechanical amplifier used to drive the rudder position to match the wheel position. The size of ''Great Eastern,'' by far the largest ship of her day, made power steering a necessity. Large steam-powered warships with manual steering needed huge crews to turn the rudder rapidly. The Royal Navy once used 78 men hauling on block and tackle gear to manually turn the rudder on HMS ''Minotaur'', in a test of manual vs. steam powered steering. Steam-powered steering engines were employed on large steamships thereafter. The Mississippi River style steamboat ''Belle of Louisville'', (originally ''Idlewild'' and oldest in her class), is fitted with a steering engine. Original equipment when the bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Block And Tackle
A block and tackle or only tackle is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads. The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load. The rope is threaded through the pulleys to provide mechanical advantage that amplifies the force applied to the rope. Hero of Alexandria described cranes formed from assemblies of pulleys in the first century. Illustrated versions of Hero's ''Mechanica'' (a book on raising heavy weights) show early block and tackle systems. Overview A block is a set of pulleys or sheaves mounted on a single frame. An assembly of blocks with a rope threaded through the pulleys is called tackle. The process of threading ropes or cables through blocks is called "reeving", and a threaded block and tackle is said to have been "rove". A block and tackle system amplifies the tension force in the rope to lift heavy loads. They are comm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Control Devices
Control may refer to: Basic meanings Economics and business * Control (management), an element of management * Control, an element of management accounting * Comptroller (or controller), a senior financial officer in an organization * Controlling interest, a percentage of voting stock shares sufficient to prevent opposition * Foreign exchange controls, regulations on trade * Internal control, a process to help achieve specific goals typically related to managing risk Mathematics and science * Control (optimal control theory), a variable for steering a controllable system of state variables toward a desired goal * Controlling for a variable in statistics * Scientific control, an experiment in which "confounding variables" are minimised to reduce error * Control variables, variables which are kept constant during an experiment * Biological pest control, a natural method of controlling pests * Control network in geodesy and surveying, a set of reference points of known geospatial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ship's Wheel
A ship's wheel or boat's wheel is a device used aboard a water vessel to steer that vessel and control its course. Together with the rest of the steering mechanism, it forms part of the helm. It is connected to a mechanical, electric servo, or hydraulic system which alters the horizontal angle of the vessel's rudder relative to its hull. In some modern ships the wheel is replaced with a simple toggle that remotely controls an electro-mechanical or electro-hydraulic drive for the rudder, with a rudder position indicator presenting feedback to the helmsman. History Until the invention of the ship's wheel, the helmsman relied on a tiller—a horizontal bar fitted directly to the top of the rudder post—or a whipstaff—a vertical stick acting on the arm of the ship's tiller. Near the start of the 18th century, a large number of vessels appeared using the ship's wheel design, but historians are unclear when the approach was first used. Design A traditional ship's wheel is comp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Servomechanism
In control engineering a servomechanism, usually shortened to servo, is an automatic device that uses error-sensing negative feedback to correct the action of a mechanism. On displacement-controlled applications, it usually includes a built-in encoder or other position feedback mechanism to ensure the output is achieving the desired effect. The term correctly applies only to systems where the feedback or error-correction signals help control mechanical position, speed, attitude or any other measurable variables. For example, an automotive power window control is not a servomechanism, as there is no automatic feedback that controls position—the operator does this by observation. By contrast a car's cruise control uses closed-loop feedback, which classifies it as a servomechanism. Applications Position control A common type of servo provides ''position control''. Commonly, servos are electric, hydraulic, or pneumatic. They operate on the principle of negative feedback ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Power Steering
A power steering is a mechanical device equipped on a motor vehicle that helps drivers steer the vehicle by reducing steering effort needed to turn the steering wheel, making it easier for the vehicle to turn or maneuver at lower speeds. Hydraulic or electric actuators add controlled energy to the steering mechanism, so the driver can provide less effort to turn the steered wheels when driving at typical speeds, and reduce considerably the physical effort necessary to turn the wheels when a vehicle is stopped or moving slowly. Power steering can also be engineered to provide some artificial feedback of forces acting on the steered wheels. Hydraulic power steering systems for cars augment steering effort via an actuator, a hydraulic cylinder that is part of a servo system. These systems have a direct mechanical connection between the steering wheel and the linkage that steers the wheels. This means that power-steering system failure (to augment effort) still permits the vehicle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Belle Of Louisville
''Belle of Louisville'' is a steamboat owned and operated by the city of Louisville, Kentucky, and moored at its downtown wharf next to the Riverfront Plaza/Belvedere during its annual operational period. The steamboat claims itself the "most widely traveled river steamboat in American history." ''Belle of Louisville''s offices are aboard '' Mayor Andrew Broaddus'', and also appears on the list of National Historic Landmarks. History Idlewild Originally named ''Idlewild'', the ''Belle of Louisville'' was built by James Rees & Sons Company in Pittsburgh, Pennsylvania, for the West Memphis Packet Company in 1914. She initially operated as a passenger ferry between Memphis, Tennessee, and West Memphis, Arkansas. She also hauled cargo such as cotton, lumber, and grain. She then came to Louisville in 1931 and ran trips between the Fontaine Ferry amusement park near downtown Louisville and Rose Island, a resort about upriver from Louisville. From 1934 through World War II, ''I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HMS Minotaur (1863)
HMS ''Minotaur'' was the lead ship of the armoured frigates built for the Royal Navy during the 1860s. They were the longest single-screw warships ever built. ''Minotaur'' took nearly four years between her launching and commissioning because she was used for evaluations of her armament and different sailing rigs. The ship spent the bulk of her active career as flagship of the Channel Squadron, including during Queen Victoria's Golden Jubilee Fleet Review in 1887. She became a training ship in 1893 and was then hulked in 1905 when she became part of the training school at Harwich. ''Minotaur'' was renamed several times before being sold for scrap in 1922 and broken up the following year. Design and description The ''Minotaur''-class armoured frigatesIronclad is the all-encompassing term for armoured warships of this period. Armoured frigates were basically designed for the same role as traditional wooden frigates, but this later changed as the size and expense of thes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ship's Wheel
A ship's wheel or boat's wheel is a device used aboard a water vessel to steer that vessel and control its course. Together with the rest of the steering mechanism, it forms part of the helm. It is connected to a mechanical, electric servo, or hydraulic system which alters the horizontal angle of the vessel's rudder relative to its hull. In some modern ships the wheel is replaced with a simple toggle that remotely controls an electro-mechanical or electro-hydraulic drive for the rudder, with a rudder position indicator presenting feedback to the helmsman. History Until the invention of the ship's wheel, the helmsman relied on a tiller—a horizontal bar fitted directly to the top of the rudder post—or a whipstaff—a vertical stick acting on the arm of the ship's tiller. Near the start of the 18th century, a large number of vessels appeared using the ship's wheel design, but historians are unclear when the approach was first used. Design A traditional ship's wheel is comp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rudder
A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, aircraft, or other vehicle that moves through a fluid medium (generally air or water). On an aircraft the rudder is used primarily to counter adverse yaw and p-factor and is not the primary control used to turn the airplane. A rudder operates by redirecting the fluid past the hull or fuselage, thus imparting a turning or yawing motion to the craft. In basic form, a rudder is a flat plane or sheet of material attached with hinges to the craft's stern, tail, or after end. Often rudders are shaped so as to minimize hydrodynamic or aerodynamic drag. On simple watercraft, a tiller—essentially, a stick or pole acting as a lever arm—may be attached to the top of the rudder to allow it to be turned by a helmsman. In larger vessels, cables, pushrods, or hydraulics may be used to link rudders to steering wheels. In typical aircraft, the rudder is operated by pedals via mechanical li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George Forrester And Company
George Forrester and Company was a British marine engine and locomotive manufacturer at Vauxhall Foundry in Liverpool, established by Scottish engineer George Forrester (b. 1780/81). The company opened in 1827 as iron founders and commenced building steam locomotives in 1834. History The company was noted in Liverpool directories from 1827 as "Iron founders", the works established in the former "Union Mill" cotton factory, known locally as the "Welsh Factory", built by Messrs. Kirkman & Co. on the east side of Vauxhall Road in the late eighteenth century, but closed after a few years, remaining empty for some time thereafter. The factory was later enlarged and the original building demolished. A significant product for the company in its early days was the production of machinery involved in sugar processing for the West Indies, before branching into marine engines. A few Railway locomotives were produced from 1834 to 1847. The Crimean War saw the factory stretched to its maximu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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