Who Invented Television? Detailed answer

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Who Invented Television? Detailed answer

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Who invented television?

Television, as you know, is a rather complicated technical process. Its origins go far into the past. It is safe to say that a huge number of people are involved in its development and improvement. Thus, television was not invented by one person.

The chain of events that led to the invention of television began in 1817, when the Swedish chemist Jens Berzelius discovered the chemical element selenium. Later, it was found that the amount of electrical current conducted by selenium depends on the amount of light that affects it. This property is called "photoelectricity".

In 1875, this discovery helped the American inventor G. Kerry to make the first imperfect television system, for which he used photovoltaic cells. The object was focused through a lens onto a stack of photovoltaic cells in such a way that each cell seemed to "control" the amount of electricity passing into the incandescent lamp. The indistinct outlines of an object designed for photovoltaic cells were then highlighted on the surface of an incandescent lamp.

The next step was the invention in 1884 by Paul Nipkow of the "unfolded image". This was achieved by using a disk with holes that rotated in front of the photovoltaic cells and another disk that rotated in front of the audience. But the principle itself was the same as that of Kerry.

In 1923, the first practical transmission of an image over wire was made by Baird in England and Jenkins in the United States.

Then there was a huge leap in the development of television cameras. Vladimir Zworykin and Phil Farnsworth independently constructed cameras known as the "iconoscope" and "picture-transmitting tube". By 1945, both of these transmitting tubes had been replaced by better ones.

Modern televisions use the so-called "cathode ray tube". This tube contains an electron gun that scans the image of the screen in the same way that rays do in a transmitting television camera, and as a result we see the image.

Of course, this doesn't tell you exactly how television works, but it does give you an idea of how many different discoveries had to be made by different people in different countries to make modern television possible.

Author: Likum A.

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How is scuba gear?

Scuba gear is a modern device for deep diving. It allows the diver to breathe underwater without being dependent on the air supply from the ship. The scuba diver carries his own supply of air with him attached to his back. He is a free diver. The compressed air supply is contained in one (or more) steel scuba cylinders. A tube extends from the valve leading to the mouth. It is made in such a way that the diver can hold it with his teeth. The nose is covered with a mask, and the scuba diver breathes through one mouth. With a scuba gear on his back and a special heavy belt to keep him underwater, a person can swim almost as freely as a fish.

When swimming, large flippers on the legs are used to do without the help of the hands being freed, so as to hold the camera or harpoon. If you do not dive to great depths, the scuba diver can stay under water for half an hour or more. But even the most modern scuba gear does not allow a person to go deeper than a hundred meters. At this depth, the gravity of the water column exerts a pressure ten times greater than at the surface. The air in the cylinders is consumed ten times faster, so that even very large cylinders last only a few minutes.

There is another problem associated with diving to very great depths. Compressed air in cylinders, like atmospheric air, consists of four-fifths of nitrogen and only one-fifth of oxygen. We need oxygen to sustain life. Normally, the nitrogen we breathe in is immediately breathed out. But under conditions of increasing air pressure, part of the nitrogen dissolves in the blood and tissues.

When a scuba diver ascends, nitrogen must be removed from his blood and tissues. If it cannot leave the body quickly enough through the lungs, it begins to turn into small bubbles in the body. The bubbles pinch the nerves and clog the blood vessels, and the scuba diver develops decompression sickness, accompanied by terrible pain. As a result of severe cases of decompression sickness, a person can die or remain disabled for life. That is why the scuba diver must rise to the surface very slowly if he was at a depth of sixty to one hundred meters. During the ascent, he must make frequent stops.

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The developers of the PC accessories manufacturer Logitech presented a prototype of the Project Ghost video chat booth - inside it you can communicate with a realistic projection of the interlocutor.

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