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Aerial ropeways or Cableways are a means of transport or carriage in which a great rope or cable, elevated above the ground on fixed supports, is made use of in conveying from place to place materials or articles of various kinds. Such a cable may be said to serve the purpose of a rail, from which are suspended the carriages, buckets, or carriers of whatever sort are employed to convey the materials dealt with, the cable being actuated by means of an engine and winding-gear of suitable construction. During the 19th century and early 20th century such cables were much used in carrying materials over a comparatively short space, as in quarries, excavations for canals, docks, etc; in the construction of bridges, in shipbuilding, etc, and in the coaling of battleships at sea from a coal transport standing by.
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Airspace is the space that lies above a state's land and sea territory and is subject to its exclusive jurisdiction.
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The Alfa Romeo 147 is an Italian automobile produced in three- and five-door models since 2001 when it was voted European Car of the Year, before undergoing revisions in 2005. The Alfa Romeo 147 is marketed as a stylish family car and is powered by a 1.9 litre four-cylinder engine providing a top speed of 129 mph, acceleration of 0 to 60 mph in just under nine seconds and a combined fuel consumption of almost 48 mpg. The Alfa Romeo 147 has been plagued by reliability issues and in October 2003 models were recalled due to a fire risk caused by an engine bay wiring short circuit on cars built between January 2002 and April 2003. Another recall occurred in April 2004 due to the power-assisted steering which could fail on GTAs made between November 2000 and March 2003. In May 2005 another recall occurred due to fuel leaks discovered on cars built between May and September 2004, in September 2006 a braking fault was discovered with the space-saver spare fitted on non-GTAs made between June 2004 and February 2006 resulting in a recall of these vehicles and in October 2006 clutch issues were discovered on vehicles made between March 2003 and October 2005.
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The Apollo Project was the US space project to land a person on the moon in order to prove to the world the ideological superiority of the American system over that of Communist Russia. It was reportedly achieved by Apollo 11 in July 1969. The three-stage vehicle to carry the astronauts to the moon was code named Saturn, and the contract to develop the Apollo three-man spacecraft was awarded to North American Aviation Incorporated in 1961 by NASA. The first launch into orbit of an Apollo command module was made by Saturn SA-6 on May the 28th 1964, and the first manned flight was made after a fire during ground tests killed the three astronauts - Virgil Grissom, Edward White and Roger Chaffee - on January the 27th 1967.
Controversy surrounds the supposed moon landing, with theories abounding that in 1969 it was technically impossible to land on the moon, and as a result NASA faked the moon landing, filming the 'landing' at the top secret military base, Area 51, in the Nevada desert while the astronauts actually orbited the earth for eight days before returning. This theory was later illustrated in the film 'Capricorn One' which told the fictional story of a faked landing on the planet Mars.
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The Aston Martin Lagonda was a British, hand-built, four-door car hailed as the 'space age car' when it was introduced in 1976. It was a variant of the Aston Martin V8 and featured touch sensitive switches, including the gear change, and electronically controlled instruments with graphic digital displays controlled by a micro-processor. The speedometer could be changed from mph to kmh by the touch of a switch. The 5340 CC engine had eight-cylinders in a V-configuration.
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Ballast is a term applied to heavy matter, such as stone, sand, iron, or water placed in the bottom of a sailing ship or other vessel to sink it in the water to such a depth as to enable it to carry sufficient sail without oversetting. The term ballast is also applied to the sand placed in bags in the car of a hot-air balloon to steady it and to enable the aeronaut to lighten the balloon by throwing part of it out. Ballast is also the name for the material used to fill up the space between the rails on a railway in order to make it firm and solid.
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A bicycle is a two wheeled vehicle driven by the riders feet pushing on cranks or pedals. A common misconception is that the earliest form of bicycle was the dandy-horse, which was pushed along by the rider's feet. However, while both the dandy-horse and the later bicycle are both velocipedes, the dandy-horse is not propelled by cranks.
The first bicycle was introduced to England from France in 1868, and comprised two solid wheels of equal size fitted to a frame, much like a modern bicycle in appearance, with a saddle fitted in the centre and propelled by cranks attached to the front wheel. This vehicle provided such a bumpy ride to the rider that it became popularly known as 'the bone-shaker'. Later came the Penny-Farthing with pedals fixed to the large front wheel which was made large to achieve high speeds. Later still, around 1895, came the safety bicycle with pedals driving the rear wheel by way of a chain, and the rider sitting upon a saddle set back from the front wheel so as to reduce the chances of falling forwards over the handlebars, from this developed the Raleigh bicycle design of 1900 which forms the basis of the modern bicycle. In 1888 the two-person tandem bicycle was invented.
In 1906 it was reported that speeds of 50 mph were attained on a bicycle. Around the same time, slightly earlier, the motorised bicycle (motorcycle or motorbike) was invented.
A typical bicycle is comprised of several parts. The principal and essential being: the frame, front forks, wheels, pedals, saddle, handlebars, chain and brakes. The largest part of the bicycle is the frame, and these vary in design depending upon the specialised intention of the bicycle.
A frame for a BMX bicycle being small, heavily braced and made of aluminium. The frame for BMX xyxling needs to be strong so as to endure the stresses of the bumpy ride, and the saddle low as competitors never sit down during a competition and as such they need space to sprint and jump with ease.
Cross-Country cycle frames are generally made of aluminium and carbon-fibre so as to be light weight. They are relatively small frames to allow quick and easy mounting and dismounting off road, and strong to endure off-road bumpy conditions. The smaller frames are often compensated for by having a longer seat post to allow a normal height saddle position.
The cycle speedway bicycle frame is designed primarily for strength, and as such is typically made from steel or aluminium.
Road racing bicycle frames are designed to be light and stiff. Traditionally they ewre made of steel, but by the start of the 21st century carbon fibre was being used for the more expensive models as this offered the same stiffness at reduced weight. The design of the tubes also developed over time, tubes becoming of a larger diameter, but thinner walls, to allow the same stiffness with reduced weight.
Bicycles are fitted with various types of brake, the most popular being the calliper, cantilever, hydraulic or disc and the V brake. The most common form of brake found on leisure bicycles, is that form used also on road racing bicycles. The calliper brake. Calliper brakes are a very efficient means of rim braking and basically comprise two blocks of rubber or plastic which are squeezed onto the wheel rim when the brake lever is squeezed by the ride.
Cantilever brakes operate on the same principal as calliper brakes, but are of a slightly different design at the wheel end, offering increased clearance between the tyre and the brake pads and as such are frequently employed for cyclo-cross bicycles and mountain bikes.
The most efficient form of rim brake is the V brake. The V brake also offers the most clearance of any rim braking system, and is most often found on mountain bikes.
Hydraulic or disc brakes are the most efficient and powerful form of bicycle brake. They use the wheel hub to brake, rather than the rim. Disc brakes offer the most clearance, and as such are used on mountain bikes, but are also expensive to fit and maintain.
Bicycle wheels are generally of one of three types. The most common and traitional bicycle wheel is the spoked wheel, comprising a rim connected to the central bub by a series of thin metal rods known as spokes. Spoked wheels are light in weight. Less common than spoked wheels, but offering greater strength and durability at the expense of weight are mag wheels which comprise a rim attached to the hub by a few, thick solid plastic bars. Solid wheels, also known as disc wheels, are made from composite material or carbon fibre are very strong, stiff, aerodynamic and very expensive. They are rarely used except as rear wheels in time-trialing and track racing.
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The block-system is a system of working the traffic on railways according to which the line is divided into sections of three or four miles, with a signal and telegraphic connection at the end of each section. The essential principle of the system is that no train is allowed to enter upon any one section until the section is signalled wholly clear, so that between two successive trains there is not merely an interval of time, but also an interval of space.
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A buffet is properly a cupboard, sideboard, or closet used to hold china, crystal, plate, and the like. The word is also very commonly applied to the space set apart for refreshments in public places, and to a spread of food from which diners serve themselves to a selection before going to eat elsewhere, as distinct from having the food laid out on the table at which the diners sit.
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A clap-net is a ground-net used by bird-catchers, consisting of two equal parts about ten metres long by two metres wide, and each having a slight frame. They are placed about one metre apart, and are pulled over by a string so as to inclose any birds on the intervening space.
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The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
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