New York is the largest city in the USA and the biggest seaport. It is the business centre of the United States.
New York is situated in the mouth of the Hudson river. In comparison with such ancient historical cities as, say, Rome, London, Moscow or Paris, New York is quite young. It was founded in 1613 by Dutch settlers.
There are five districts in the city: Manhattan, the Bronx, Queens, Brooklyn and Richmond. Manhattan is the central and the oldest part of the city. It is the district of business and finance. It is here in Wall Street that many business offices, banks and the world famous New York stock exchange are situated. The New York stock exchange dominates business life of many countries.
The total area of New York is 365 square miles or 900 square kilometres. Its population together with the population of its suburbs amounts to 16 million people.
Among the inhabitants of New York one can meet people of almost all nationalities. They settled here during the immigration in the 19th and at the beginning of the 20th century.
A traveller who visits New York for the first time wonders at the modern architecture. The Statue of Liberty, which is on Liberty Island, was a present from France in 1876 on the occasion of the 100th anniversary of American independence. This statue and a few 18th and 19th century churches, hospitals, newspaper offices and other buildings are the only examples of "old" architecture in New York. Wherever your eyes travel, everywhere you can see sky-scrapers. New York, one of the USA leading manufacturing cities, is the home of great firms and banks. The most important branches of industry are those producing vehicles, glass, chemicals and all kinds of machinery. The city has very busy traffic. Its streets and highways are full of cars and buses.
The mouth of the Hudson river makes an excellent harbour for numerous passengers and cargo ships from all over the world.
Speaking about New York one can't but mention the outstanding role, the city plays, in the cultural life of the country. New York has many museums and art galleries which have collected works of art of many peoples and of all times. Many of them are on constant display in the Metropolitan Museum of Art, the Whitney Museum of Art. Most of the theatres and cinemas are in or near Broadway, the longest street and the biggest shopping district in New York. The Metropolitan and Modern Arts Museums attract many visitors.
Основная идея, которую он имел в виду вот что: если электрический ток в проводе может производить магнитный эффект, то почему бы не магнит рядом с проводом производить электрический ток? Это было действительно простой поворот 1820 открытие Эрстеда.
По счастливому выбора, он решил работать не с прямым бар Ор даже подковы магнита, но с кольцом.
Это произошло много раз: каждый раз, когда ток батареи пришли на, игла связана с противоположной, не связанных катушка отклоняется, а затем остановился; Каждый раз, когда цепь была нарушена, тот же самый эффект был замечен.
Вместо этого он получил его только тогда, когда магнитное поле в железном кольце меняется - либо включения или выключения.
Однако, как стрелка гальванометра показала, электричество, однако слабое, текла на мгновение каждый раз через левую катушку. Это было ново электроэнергии, где их раньше не было, и это было произведено, или индуцированной электромагнетизм.