Homeliness, Tools and equipment
Correctly selected door eye - protection of the apartment from intruders
It's unpleasant when you call at your door, and you are completely unaware of who is on her side. You can call yourself anything, introduce yourself - anyone. The voice can be faked. Only with my own eyes, seeing the otherworldly visitor, you can open the door. In the Middle Ages, there was an observation slot for this, like a loophole. Today - the peephole. However, the eye of the eye is a big strife.
Therefore, the optimal viewing angle of the door eye begins at 180 degrees. Security experts advise choosing 200 degrees - due to the fact that at the edges of the view this angle gives less distortion. In this case, it will be possible to consider the entire visitor, down to the shoes on his legs.
The material from which the peephole is made, too, is of no small importance. Immediately and forever goodbye to plastic: cheap, but inefficient. Electrified plastic, like a magnet, attracts dust to itself, and after a while, the optical properties of plastic slowly but inevitably deteriorate. It is better to put once, but "for centuries". Then pay attention to the union of metal and glass, optical or spectacled. Only the metal should have a coating, so as not to darken with time.
Of course, there can be no question of any kind of silence if there is a child left at home. After all, in order to look at the peephole, he first needs to bring him into the hallway chair, and then climb it. The problem is solved by a more complex, but also a safe device of the periscope type. In this case, the ocular eyelet is located at the level of child growth.
The last of the considered optical options, the most suitable for both adults and children, is the door-peephole. The eyepiece is replaced with a frosted glass, which, as on the screen, is projected the entire surveyed area in front of the door. The image on the screen is perfectly visible from 1.5-2 meters.
In doing so, however, do not forget that the stairwell is a common use area, and it is illegal to keep a hidden picture on it.
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