Nitrocellulose coating for polished surfaces. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Nitrocellulose coating for polished surfaces. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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Appropriate solutions nitrocellulose are a good tool for the protection of polished surfaces; in the past, solutions of nitrocellulose in amyl acetate and collodion were recommended for this. Collodion is not suitable for this, since the escaping ether-alcohol vapors are dangerous.

Amyl acetate, on the other hand, spreads an unpleasant odor even after a long drying time. Therefore, it is advisable to use a solution of nitrocellulose in formic amyl ether. Such coatings do not smell after drying.

The evaporation temperature of such a solution is approximately 15 °C higher than the evaporation temperature of an amyl acetate solution; solutions of formic amyl ether are more liquid than solutions of amyl acetate of the same strength.

It is best to apply a XNUMX% solution by spraying or otherwise covering the surface. The solvent is removed each time. The resulting coating does not form a coherent film, but it is reported to protect the varnish well.

Author: Korolev V.A.

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It has long been known that some blind people develop the ability to echolocate. When walking, they click their tongue, and by picking up a faint echo from these clicks, they can estimate the distance to an object, its size, shape, and even the texture of its surface. A group of Canadian researchers decided to figure out how the brain copes with such a task. Recruiting a group of blind and sighted volunteers, they invited them to listen to tape-recorded clicks with an echo, while simultaneously observing what was happening in their brain using a magnetic resonance imaging scanner.

It turned out that everyone's brain reacted to sounds in the same way, and only those blind people who developed a sense of echolocation in themselves activated the so-called "spur" region of the cortex, which works with images in sighted people. When the volunteers were asked to listen to the same clicks, but without echo, this area did not activate at all. This meant that the region of the brain responsible for vision in blind people begins to process sounds, and not all, but the echo.

Scientists do not yet fully understand why this particular part of the cortex is activated. They suggest that, left with a blind man without work, this region begins to work with the information that comes to it from other senses, that is, from the ear. Human echolocation has been studied very poorly, but the researchers involved in it claim that with its help a blind person can find an unoccupied chair in a restaurant, determine what the wall is made of - brick or cement; he can even, they argue, cycle through a crowded street.

Scientists are convinced that echolocation is by no means a rare gift, and many can develop it in themselves. True, while they still do not quite understand how this can be taught.

“Echolocation can be learned even by sighted people,” says one of the study participants Melvin Goodale from the University of Western Ontario, “although it is not yet clear how well they will do it. After all, the part of the cortex responsible for vision deals with visual "However, I know some sighted people who have learned to echo well. This property can be useful, say, to firefighters, with its help they can find a way out of the room in complete darkness."

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