engineering

Tokyo Tower

Tokyo Tower is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tokyo Tower rather than just read about it. In short: Tokyo Tower (東京タワー, Tōkyō Tawā; pronounced [toːkʲoː taꜜɰᵝaː] ), also known by its official name Japan Radio Tower (日本電波塔, Nippon denpatō) is a communications and observation tower in the district of Shiba-koen in Minato, Tokyo, Japan, completed in 1958. At 332.9 meters (1,092 feet), it was the tallest tower in Japan until the construction of Tokyo Skytree in 2012.

Key takeaways

Tokyo Tower belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tokyo Tower to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tokyo Tower from memory before moving on to harder problems.

Reference excerpt

Tokyo Tower (東京タワー, Tōkyō Tawā; pronounced [toːkʲoː taꜜɰᵝaː] ), also known by its official name Japan Radio Tower (日本電波塔, Nippon denpatō) is a communications and observation tower in the district of Shiba-koen in Minato, Tokyo, Japan, completed in 1958. At 332.9 meters (1,092 feet), it was the tallest tower in Japan until the construction of Tokyo Skytree in 2012. It is a lattice tower inspired by the Eiffel Tower, and is painted white and international orange to comply with air safety regulations. The tower's main sources of income are antenna leasing and tourism, and its five-story base building FootTown houses a number of restaurants, gift shops, and other attractions. Departing from it, guests can visit two observation decks: the two-story Main Deck at 150 m (490 ft), and the smaller Top Deck at 249.6 m (819 ft). The tower is repainted every five years, the process itself taking a year to complete. In 1961, transmission antennas were added. They are used for radio and television broadcasting and now broadcast signals for media outlets such as NHK, TBS Television, and Fuji Television. The height of the tower was not suitable for Japan's planned terrestrial digital broadcasting planned for July 2011, and for the Tokyo area. A taller digital broadcasting tower, known as Tokyo Skytree, was completed on 29 February 2012. Tokyo Tower has become a prominent landmark and frequently appears in media set in Tokyo.

Construction

A large broadcasting tower was needed in the Kantō region after NHK, Japan's public broadcasting station, began television broadcasting in 1953. Private broadcasting companies began operating in the months following the construction of NHK's own transmission tower. This communications boom led the Japanese government to believe that transmission towers would soon be built all over Tokyo, eventually overrunning the city. The proposed solution was the construction of one large tower capable of transmitting to the entire region. Furthermore, because of the country's postwar boom in the 1950s, Japan was searching for a monument to symbolize its national recovery from World War II, as one of the countries most ravaged by the war. Hisakichi Maeda, founder and president of Nippon Denpatō, the tower's owner and operator, originally planned for the tower to be taller than the Empire State Building, which at 381 m (1,250 ft) was the highest structure in the world at the time. However, the plan fell through because of the lack of both funds and materials. The tower's height was eventually determined by the distance the TV stations needed to transmit throughout the Kantō region, a distance of about 150 kilometers (93 miles). Tachū Naitō, designer of tall buildings in Japan, was chosen to design the newly proposed tower. Looking to the Western world for inspiration, Naitō based his design on the Eiffel Tower in Paris, France. With the help of engineering company Nikken Sekkei Ltd., Naitō claimed his design could withstand earthquakes with twice the intensity of the 1923 Great Kantō earthquake or typhoons with wind speeds of up to 220 km/h (140 mph). The new construction project attracted hundreds of tobi (鳶), traditional Japanese construction workers who specialized in the construction of high-rise structures. The Takenaka Corporation broke ground in June 1957 and each day at least 400 laborers worked on the tower. It was constructed of steel, a third of which was scrap metal taken from US tanks damaged in the Korean War. When the 90-meter (300 ft)-long antenna was bolted into place on 14 October 1958, Tokyo Tower was the tallest freestanding tower in the world, taking the title from the Eiffel Tower by 9 m (30 ft). Though physically taller than the Eiffel Tower, Tokyo Tower weighs about 4,000 tons, 3,300 less than the Eiffel Tower as it is significantly thinner and simpler in construction. It was opened to the public on 23 December 1958 at a final cost of ¥2.8 billion ($8.4 million in 1958). Tokyo Tower was mortgaged for ¥10 billion in 2000. It was the tallest artificial structure in Japan until April 2012, when it was surpassed by the Tokyo Skytree. Planned as an antenna for telecommunications and brightly colored in accordance with the time's Aviation Law, the tower's two panoramic observatories are mostly frequented by tourists today. The tower constitutes a clear reference point in the city's skyline, forming a strong landmark, both night and day. The tower is periodically repainted in a process that takes about a year to complete. This traditionally occurred every five years, but the latest painting in 2019 utilized a new, more durable coating that extended the official timetable to seven years, projecting the next painting for 2026.

Functions

Tokyo Tower's two main revenue sources are antenna leasing and tourism. It functions as a radio and television broadcasting antenna support structure and is a tourist destination that houses a variety of attractions. The tower recorded its 190 millionth visitor in 2024. Previously, visitor numbers had steadily declined in the 1990s, bottoming out at 2.3 million in 2000 before rising again. The first area tourists visit upon reaching the tower is FootTown, a five-story building stationed directly at the base. There, visitors can eat, shop, and enjoy various novelties and attractions. Elevators that depart from the first floor of FootTown can be used to reach the first of two observation decks, the two-story Main Observatory. For the price of another ticket, visitors can board another set of elevators from the second floor of the Main Observatory to reach the final observation deck—the Special Observatory. The names were changed following renovation of the top deck in 2018.

Broadcasting

Tokyo Tower, a member of the World Federation of Great Towers, has been used by many organizations for broadcasting purposes. The structure was intended for broadcasting television, but radio antennas were installed in 1961 because it could accommodate them. While analog and digital television broadcasts are no longer conducted from the site, two FM radio stations remain on Tokyo Tower. Stations that use or have used the tower's antenna include:

Current Tokyo FM (JOAU-FM): 80.0 MHz InterFM (JODW-FM): 89.7 MHz

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Tokyo Tower

Start with the simplest possible case. Write down what Tokyo Tower claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tokyo Tower before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tokyo Tower ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tokyo Tower

In research: Tokyo Tower appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tokyo Tower in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tokyo Tower is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1958 establishments in Japan, Buildings and structures in Minato, Tokyo, Iron and steel buildings, so understanding it makes those chapters shorter.
In everyday life: Look for Tokyo Tower outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Tokyo Tower in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tokyo Tower means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Tokyo Tower out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tokyo Tower in simple terms?

Why does Tokyo Tower matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tokyo Tower?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tokyo Tower.