Переведите текст на российский языкTwo discoveries in the middle of the

Переведите текст на российский язык

Two discoveries in the middle of the 1800s made it possible to build modern skyscrapers. Before the Industrial Revolution brick and stone walls carried the weight of buildings. Because each floor was very heavy it was impossible to build very high houses. In the middle of the 19th century steel became an important building material. This metal was strong and light. Architects could now construct a steel skeleton to support very tall buildings. Chicagos Home Insurance Company Building was ten stories tall and the first skyscraper to use such a steel construction.



Skyscrapers would have been useless if people had to walk up and down many flights of stairs. In 1853 an elevator safe enough to carry passengers was invented by Elisha Graves Otis.