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Artificial flowers are imitations of real flowers, made of various materials. These are not a modern invention. The Romans excelled in the art of imitating flowers in wax, and in this branch of the art attained a high degree of perfection. The Egyptian artificial flowers were made of thin plates of horn stained in different colours, sometimes also of leaves of copper gilt or silvered over. In modern times the Italians were the first to acquire celebrity for the skill and taste they displayed in this manufacture, but they are now far surpassed by English and French manufacturers, but more especially by the latter. During the Victorian period cambric, muslin, satin, velvet, and other woven fabrics, feathers, india-rubber, blown glass, mother of pearl, brass, etc were all employed in making artificial flowers, later silk and plastic were more commonly used, and good results may be had from dyed wood.
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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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Factory Acts are acts passed for the regulation of factories and similar establishments. In the 18th and 19th century it was considered that women and children were not qualified fully to protect themselves against the strain of competition, and asa result the British legislature passed a series of acts to regulate the conditions of their employment in factories.
The immediate occasion of the first act passed to regulate factory employment in England was the outbreak of an epidemic disease which committed great havoc among the younger persons employed in factories in the district round Manchester at the beginning of the 19th century.
An act was passed in 1802, The Health and Morals of Apprentices Act, in which provision was made for the regular cleansing and ventilation of mills and factories, and also for limiting the hours of work to twelve daily and forbade night work for children, and made provisions for their proper accommodation.
In 1819 an act followed after Robert Owen, an important factory-owner in Scotland, demonstrated that it was possible to improve factory conditions and make profits at the same time, and later campaigned for State reform. This Act prescribed an hour and a half for meals in the course of a working day, and prohibited children under nine years of age being employed in factorywork at all.
Early Factory Acts were not enforced, and as such were impotent. In 1833 the first truly effective Factory Act was passed. This act applied to all textile factories, and stated that no child under the age of nine was to work in a mill; children under the age of 13 were restricted to working no more than nine hours in a day and children between the ages of 13 and 18 were restricted to working no more than 12 hours in a day. The vital feature of this Act was that it was successfully enforced by full-time inspectors, whose job was to see that it was obeyed in the factories.
Various acts were passed up to 1878, when a general factory and Workshop Act was passed, consolidating the previous series of statutes. Another general act was passed in 1901 and since then numerous regulations and acts have been introduced.
The original acts contained general provisions regarding drainage, sanitary conveniences, overcrowding, ventilation, fencing of dangerous machinery, etc. Addressing what we would now term health and safety.
Factories are distinguished from workshops as making use of, originally, steam or other mechanical power. In the 19th century British textile factories the hours of labour for women and young persons (the latter between 14 and 18 years of age) were restricted to 10, but only 6.5 on Saturday and 56 in the week. In 19th century British non-textile factories and workshops the hours permitted were 10.5 per day and 60 per week at most. Children (of 11 to 14 years) were still employed, but not allowed to be employed more than 6.5 hours on any one day. Provision was made for a certain number of annual holidays. Special provisions for particular kinds of factories were made by separate acts, and under these the employment of females and young persons was regulated in bleaching and dyeing works, lace-factories, manufactories of earthenware, Lucifer matches, percussion caps, cartridges, blast-furnaces, copper-mills, forges, foundries, manufactories of machinery, metal, India-rubber, gutta-percha, paper, glass, tobacco, letterpress printing, bookbinding, etc. The factory act of 1895 included laundries. Certain exceptions in regard to working overtime were provided for; thus women could sometimes work 14 hours a day. Before the start of the 20th century there was no direct interference in any of the factory acts with the labour of adult male persons but it was recognised that indirectly the position of the male-labourer was also affected by legislation of this sort, causing some consternation among the factory owners.
The factory acts were among the first employment laws formalised to protect workers, and while they originally sought to protect primarily women and children, during the 20th century they evolved into more general employment laws offering regulation and some protection to all employees, with the employment of children being stopped all together and later men being treated equally with women, an employee being considered a person irrespective of sex.
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Glue is an adhesive substance made by boiling animal hides, hooves or bones. Glue consists of gelatine and chondrin, the proportions defining the adhesive qualities of the glue. Glue made from skins is superior to that made from bones, and the best glue is called 'Scotch glue'.
During the Victorian period large quantities of glue were produced from the skins of sheep, calves, cows, hares, dogs, cats, etc, from the refuse of tanneries and tawing works, from old gloves, from sinews, tendons, and other offal of animal origin.
By a process of cleaning and boiling the albuminoid elements of the animal matter are changed into gelatine. This in a soft jelly-like state constitutes size; dried into hard, brittle, glassy cakes, which before use must be melted in hot water, it formed the common glue used by joiners, etc during the Victorian period. When a solution is mixed with acetic or nitric acid it remains liquid, but still retains its power of cementing; in this state it is called liquid glue. Marine Glue is a cement made by dissolving india-rubber in oil of turpentine or coal-naphtha, to which an equal quantity of shellac is added.
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Rabot is a rubber of hard wood used in smoothing marble to be polished.
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Silk screening is a method of printing repeated motifs using a frame over which a piece of silk fabric is tightly stretched. Over the silk is laid a masking sheet, often of shellac coated paper, into which the design has been cut. The masking sheet is pressed firmly against the silk and printing may then be carried out by drawing a rubber squeegee across the screen, the ink or paint passing through the cut out parts of the mask through the silk onto the material below.
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Superdynamation was a term used by Ray Harryhausen for his method of animating rubber monsters in film making.
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The gutta-percha tree (Isonandra gutta) is a large tree, some 20 metres tall of the family Sapotaceae growing in South-East Asia, including at one time in Singapore, but excessive cutting of the trees there instead of tapping them for their resin led to their extinction on Singapore. It's resin (gutta- percha) is tapped and used as a form of rubber.
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Charles Goodyear was an American inventor. He was born in 1800 at Connecticut and died in 1860. By persistent experiment he discovered the vulcanising process by which he rendered India-rubber useful.
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Charles Macintosh was a Scottish chemist. He was born in 1766 and died in 1843. While trying to utilise the coal-naptha given off in distilling tar, he discovered a process of dissolving India-rubber and waterproofing cloth. He patented the invention in 1823, and the Mackintosh was created.
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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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