When did the first attempt to launch a jet aircraft with a person on board take place? Detailed answer

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When did the first attempt to launch a jet aircraft with a person on board take place? Detailed answer

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When did the first attempt to launch a jet aircraft with a person on board take place?

According to legend, after the Chinese in the X century. received a composition for launching firework rockets, the inventor Wang Hu built an aircraft from two paper dragons, to which he attached 42 such rockets. A seat was also arranged between the two dragons, on which Wang Hu decided to take to the air. When all 42 rockets were set on fire at the same time, the inventor, along with the dragons, quickly turned into ashes.

In 1930, in England, F. Whittle patented the jet engine he developed and began its development. In Germany, Hans von Ohain patented his version of such an engine in 1936. The two men worked independently, and by the end of World War II, both Germany and Britain were building jet aircraft.

Author: Mendeleev V.A.

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Where did emeralds come from?

In ancient times, different gemstones were distinguished only by their colors. The name "ruby" was given to all red-colored stones. All green stones were called emeralds. And all the blue ones were called sapphires. Later it was noticed that some gemstones are harder than others and last longer. It has been established that the value of a precious stone depends not only on its color, brilliance and rarity, but also on its hardness.

All semi-precious stones are called precious. But, strictly speaking, the word "precious" is used only in relation to the four most valuable stones - diamond, ruby, emerald and sapphire. The remaining valuable stones are called semi-precious.

Emerald is one of the softest gemstones. It is a type of beryl. In its ideal form, the emerald is rich, pure green. But flawless stones are rare and therefore very expensive.

In ancient times, all emeralds were mined in the mines of Egypt. These mines are still in operation today. But the number of mined emeralds is small. The best emeralds in our time are mined in mines near the capital of Colombia - Bogotá. There are deposits of emeralds in the Urals in Russia and in the Salzburg Alps. Several fine emeralds have been found in North Carolina. And more recent finds of emeralds have been made in the Transvaal (South Africa).

There are many legends about emeralds. One of them says that the Holy Grail, from which Christ drank at the last Vespers, was carved from a huge emerald. It was believed that the emerald has healing power - it cures epilepsy. According to another old legend, the emerald endowed its owner with the gift of predicting the future. It was said that by peering into the green depths, you can see things that will happen to you. The largest known uncut emerald is 5 cm long and 5 cm in diameter.

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