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Tower Bridge (3)

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Punktid
Tower Bridge
General
· Tower Bridge is a combined bascule and
suspension bridge in London, England,
over the River Thames. It is close to the
Tower of London, which gives it its name.
It has become an iconic symbol of
London.
Design
· In the second half of the 19th century, increased
commercial development in the East End of London
led to a requirement for a new river crossing
downstream of London Bridge.
· Subway Committee was formed in 1876, chaired by
Sir Albert Joseph Altman, to find a solution to the
river crossing problem. It opened the design of the
crossing to public competition. Over 50 designs
were submitted.
· Jones' engineer, Sir John Wolfe Barry,
devised the idea of a bascule bridge 800
feet (244 m) in length with two towers
each 213 feet (65 m) high, built on piers.
The central span of 200 feet (61 m)
between the towers was split into two
equal leaves, which could be raised to an
angle of 83 degrees to allow river traffic to
pass. The leaves, weighing over 1,000
tons each, were balanced to minimize the
force required and allow raising in five
minutes.
· Jones died in 1887 and George D.
Stevenson took over the project.
· Stevenson replaced Jones' original brick
facade with the more ornate Victorian
Gothic style, which makes the bridge a
distinctive landmark.
· The bridge was officially opened on 30
June 1894 by The Prince of Wales.
· The total cost of construction was
£1,200,000.
Hydraulic systems
· The original raising mechanism was
powered by pressurised water.
· In 1974, the original operating mechanism
was largely replaced by a new electro-
hydraulic drive system.
· During World War II, as a precaution
against the existing engines being
damaged by enemy action, a third engine
was installed in 1942.
Incidents
· In December 1952, the bridge opened while a
number 78 double-decker bus was on it. At that
time, the gateman would ring a warning bell and
close the gates when the bridge was clear
before the watchman ordered the lift. The
process failed while a relief watchman was on
duty. The bus was near the edge of the south
bascule when it started to rise; driver Albert
Gunter made a split-second decision to
accelerate the bus, clearing a three-foot drop
onto the north bascule, which had not started to
rise. There were no serious injuries.
· Before dawn on 31 October 2003, David Crick, a
Fathers 4 Justice campaigner, climbed a 120 ft
(37 m) tower crane near Tower Bridge at the
start of a six day protest dressed as Spider-Man.
Fearing for his safety, and that of motorists
should he fall, police cordoned off the area,
closing the bridge and surrounding roads and
causing widespread traffic congestion across the
City and east London. The Metropolitan Police
were later criticised for maintaining the closure
for five days when this was not strictly necessary
in the eyes of some citizens.
Traffic
· Tower Bridge is still a busy and vital crossing of the
Thames: it is crossed by over 40,000 people
(motorists and pedestrians) every day.
· The bascules are raised around 1000 times a year.
River traffic is now much reduced, but it still takes
priority over road traffic.
· In order to maintain the integrity of the historic
structure, the City of London Corporation have
imposed a 20 miles per hour (32 km/h) speed
restriction, and an 18 tonne weight limit on vehicles
using the bridge. A sophisticated camera system
measures the speed of traffic crossing the bridge,
utilising a number plate recognition system to send
fixed penalty charges to speeding drivers.
Questions?
Vasakule Paremale
Tower Bridge #1 Tower Bridge #2 Tower Bridge #3 Tower Bridge #4 Tower Bridge #5 Tower Bridge #6 Tower Bridge #7 Tower Bridge #8 Tower Bridge #9 Tower Bridge #10 Tower Bridge #11 Tower Bridge #12 Tower Bridge #13 Tower Bridge #14 Tower Bridge #15
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Allalaadimisi 18 laadimist Kokku alla laetud
Kommentaarid 3 arvamust Teiste kasutajate poolt lisatud kommentaarid
Autor andz31 Õppematerjali autor
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THE CITY OF LONDON History The City of London occupies one square mile in the middle of the capital. It once made up entire town of London, surrounded by the wall first built by Romans. The Romans also built a bridge over the Thames and there has been one in the same area ever since. The Roman Londinium grew up on the northern side of the bridge. In AD 61 the native Celtic tribe, led by Queen Boudicca, rose up against the Romans. They burnt down Londinium to the ground and killed most of its inhabitants. Roman armies eventually defeated Boudicca and Londinium was rebuilt. At the end of the fourth century AD the Roman Empire began to crumble and the Roman armies were recalled from Britain to defend Rome itself. Once they had left, tribes such as Angles, Saxons and Jutes invaded and settled in from Holland, Germany and Denmark

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Foreword Bridging rivers, gorges, narrows, straits, and valleys always has played an important role in the history of human settlement. Since ancient times, bridges have been the most visible testimony of the noble craft of engineers. A bridge can be defined in many ways, but Andrea Palladio, the great 16th century Italian architect and engineer, hit on the essence of bridge building when he said "...bridges should befit the spirit of the community by exhibiting commodiousness, firmness, and delight." In more practical terms, he went on to explain that the way to avoid having the bridge carried away by the violence of water was to make the bridge without fixing any posts in the water. Since the beginning of time, the goal of bridge builders has been to create as wide a span as possible which is commodious, firm, and occasionally delightful

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displayed in the Museum of London in the Barbican. At the end of the fourth century AD the Roman Empire began to crumble and the Roman armies were recalled from Britain to defend Rome itself. Once they had left Anglo-Saxons invaded and settled in Britain. They were farming people who preffered to live outside towns. For a while London probably lay in ruins, but it eventually developed again, partly because of its position on the river was good for trading. The Tower of London There is more of London's history in the Tower than anywhere else in London. It is the oldest surviving building in the capital. The Tower of London was begun by William the Conqueror in 1078 as a castle and a palace but even before the site had been used by the Romans and Anglo-Saxons. The tower comprises not one, but 20 towers, the oldest, the White Tower, dates back to the 11 th Century. The Roman stone wall, parts of which can still be seen on the territory of the

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Tower Bridge is a combined bascule and suspension bridge in London, England, over the River Thames. It is close to the Tower of London, which gives it its name. It has become an iconic symbol of London. The bridge consists of two towers which are tied together at the upper level by means of two horizontal walkways which are designed to withstand the horizontal forces exerted by the suspended sections of the bridge on the landward sides of the towers. The vertical component of the forces in the suspended sections and the vertical reactions of the two walkways are carried by the two robust towers. The bascule pivots and operating machinery are housed in the base of each tower. The bridge's present colour dates from 1977 when it was painted red, white and blue for the Queen's Silver Jubilee. Originally it was painted a chocolate brown colour.

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The coolest month is January. Winders are seldom below freezing. Rainfall is regular, but most often in the form of drizzle occurring throughout the year. Snow occurs sometimes in winter but rarely settles more than a few millimetres deep. History The origin of London may be dated around the beginning of the 1st century AD, when a Celtic tribe settled near a fordable point of the Thames. L achieved real importance following the Roman conquest under Claudius (43AD). The Romans build a bridge, somewhat east of the present city. This bridge soon was part of a trade road and attracted more and more traders. Soon the flourishing city Londinium came into existence. The Romans rebuilt the town into a centre of great importance. After the Romans withdrew from Britain in the Picts, Scots, Jutes, Angles and Saxons invaded London. It started to expand again under the Saxon kings. London was described as a commercial centre into which goods from all parts of the world flew by land and sea.

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London important sights guide Roman period ­ 20th century · Big Ben is the nickname for the great bell of the clock at the north end of the Palace of Westminster in London and is often extended to refer to the clock or the clock tower as well. It is the largest four-faced chiming clock and the third-tallest free-standing clock tower in the world. The clock first ticked on 31 May 1859. The pendulum is installed within an enclosed windproof box sunk beneath the clockroom. It is 3.9m long, weighs 300 kg and beats every 2 seconds. The clockwork mechanism in a room below weighs 5 tons. · Buckingham Palace is the official London residence of the British monarch. Originally known as,

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grown up around it. London has been an important settlement for over two millenniums. It is also one of the world's leading business, financial and cultural centres and its influence in politics, education, entertainment and even fashion contribute to its status as a major global city. London is a major tourist attraction with four world heritage sites, several royal parks and numerous iconic landmarks such as the Houses of Parliament, Towe Bridge, the Tower of London, Westminster Abbey and the London Eye. 2. History Although there is some evidence of a permanent settlement before the Romans came in 43 A.D., it is more accepted by historians that the Romans were the first. The settlement was called Londinium. The first London lasted for just seventeen years, for around AD 61, a tribe of Celts led by Queen Boudica stormed London, burning it to the ground. The next heavily-planned London

Inglise keel




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Kommentaarid (3)

joelvali profiilipilt
joelvali: Tyra,see ju puhas sitt,igaüks saab wikipediast mahakirjutatud!

Raiskasin 50 punkti mingi sita peale.



Aitähh!

Minge PERSSE!
17:21 28-11-2011
rubinjo profiilipilt
rubinjo: ei kiida väga, kõik materjal on copy-paste wikipedia tekstist :( sammuti pildid
20:46 14-02-2010
Merkaperka profiilipilt
Merkaperka: väga hea materjal

14:56 11-05-2011



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