CN Tower, Toronto downtown

Structure of the day_CN Tower, Toronto

                                                        high engineering marvel ...

Image source :http://www.torontokiosk.ca/

This 1 ,815-ft (1 ,553-m) high engineering marvel has been classified as one of the Seven Wonders of the Modern World. In the 1970s, the railway conglomerate Canadian National Railway (C N), in consultation with local broadcasters, decided to build a new transmission mast to meet Toronto's growing telecommunications needs and to demonstrate its pride in the city. Upon its opening, the tower so impressed visitors that it soon became one of Canada's principal tourist attractions. Its revolving restaurant is renowned for both its food and wine, and its spectacular views.

FASCINATING FACTS

Construction of the tower began in 1973, took about 40 months to complete, and cost around CA$63 million. A 75,000 sq-ft (6,968 sq-m) entertainment expansion and renovation was completed in 1998 at a cost of CA$26 million. The tower has six elevators, which travel at 15 mph (24 kmlh) and reach the Lookout Level at 1, 136 ft (346 m) in 58 seconds; a separate elevator takes visitors 32 9 ft ( 1 0 1 m) higher to the Sky Pod. The tower is flexible, and in winds of 12 0 mph ( 19 5 kmlh), the Sky Pod cqn sway 18 inches (0 48 m) from the center. Every year, about 2 million people visit the tower.

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TALLEST SUPPORTED STRUCTURES

There are dozens of television and/or radio broadcast masts that measure more than 2,000 ft (600 m) and all are in the US. Supported by guy wires, these structures do not qualify for inclusion in the Tallest Buildings in the World list. The highest is a 2,063-ft (629-m) television mast near Fargo, North Dakota. Poland's Warsaw Radio Mast was the tallest ever guy-wire-supported mast, at 2, 120 ft (647 m), before it collapsed in 1991.

Outdoor Observation Level

Open to the elements, this outdoor terrace is secured with steel safety grills. Air temperatures at this height can be up to 50°F (1 0°() cooler than at ground level.

Image source : http://americandigest.org/

Glass Floor

The ground is more than 1,122 ft (342m) below this thick I ayer of reinforced glass, made from 256 sq ft (24 sq m) of solid glass that is five times stronger than the weight-bearing standard for commercial floors.

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Interior Staircase

This is the longest metal staircase in the world, with 1,776 steps. It is opened to the public twice a yearfor fun dr aising stair eli mbs that attract almost 20,000 climbers.

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Exterior Elevators

High-speed and glass-fronted, the elevators shoot visitors up the outside of the building to the upper levels. They reach the Lookout Level in less than a minute.

OBSERVATION DECKS

The Lookout Level enables visitors to look out across Toronto. Actually built over several I evels, the upper tier has a cafe and a photo shop. One level below, visitors can feel the wind at 113 stories up, peer straight down through the glass floor or dine in the revolving restaurant. Thirty-three stories above the I ookout, the Sky Pod is higher than many of the world's tallest skyscrapers, even though it is not the top of the CN Tower. With <Jn impressive 360-degree view of Toronto and Lake Ontario, on a clear day visitors can see as far as Niagara Falls from this observation deck.

THE WORLD'S TALLEST BUILDINGS

When assessing a structure for its ranking in the Tall est Buildings in the World list, the international organization the Council on Tall Buildings and Urban Habitat (CTBUH), which sets the criteria for defining and measuring tall buildings, includes only those where at least 50 percent of the height is occupied by useable floor area. It also only measures a building's architectural height and excludes broadcasting aerials and masts. The CN Tower does not meet these criteria, and so it is categorized as a freestanding structure. The tower was the world's tallest freestanding structure from 19 75 until 2007, when its height was surpassed by the 2,717-ft (828-m) Burj Khalifa in Dubai, which currently tops the C TBU H' s Tallest Buildings in the World list, and the Guangzhou N & Sightseeing Tower in China, which is 2,000 ft (61 0 m) high.

Sources :  wikipedia

CN Tower, Toronto

The Warrior

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