On what planes and why was a periscope installed? Detailed answer

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On what planes and why was a periscope installed? Detailed answer

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On what planes and why was a periscope installed?

The Soviet T-4 supersonic bomber was developed as an effective weapon against American aircraft carriers. When flying at an altitude of up to 24 km, he could reach a speed of 3000 km / h, so that enemy radar stations did not have time to direct an anti-aircraft missile at the aircraft. Such technical requirements required several extraordinary solutions from the designers, among which is a deflectable bow. At extreme altitudes and speeds, the nose was raised to reduce drag, and the pilot could only control the aircraft using instruments, but during takeoff and landing, the nose deviated and provided an overview. And in case of an emergency failure of the bow of the T-4, it was equipped with a periscope retractable above the cockpit.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

How is butter made?

Most of the butter sold in shops and markets is produced at oil mills that buy milk and sour cream from farmers.

After the sour cream is cleared of impurities, it is pasteurized. Most of the oil is produced from sweet sour cream. Sometimes pure sourdough is added to it - bacteria that produce lactic acid, mixed with other microorganisms. They help sour cream to ripen, to reach the desired condition. Sometimes dyes are added. Then the beating starts. It is produced in special rotating drums, where sour cream turns into a thick mass. Whipping takes about an hour. After that, the mixture is washed with water, the water drains. What remains is the oil.

Sometimes salt is added to the oil. The oil is kneaded mechanically until the desired density and water content are reached. Then the oil hardens, it is ready for packaging. Initially, it is packaged in large containers weighing about 30 kilograms. Then these packages are opened again and the oil is hung on the scales in any convenient quantities.

Man has been making oil since ancient times. It is mentioned many times in the Bible. In Proverbs 30-33: "Surely churning milk will produce butter." The Hindus used oil as early as 900 BC. e. It was part of their religious rites.

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Sleeping before bed improves memory 06.02.2019

Children are usually rocked before bed so that they fall asleep faster. But, as experiments show, lulling helps to sleep not only for children, but also for adults. Researchers from the Universities of Geneva and Lausanne invited 18 volunteers to spend three nights in the laboratory. On the first night, they simply got used to the new environment, and on the other two, some participants in the experiment began to rock on a special bed before going to bed, while others continued to sleep as usual.

Those who were rocked fell asleep faster, slept longer, their sleep was deeper. And their memory also improved: in the morning, those who were rocked, remembered better the pairs of words that they were asked to learn before going to bed.

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