Collar for a skein. Drawing, description

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Clamp for a skein. Tips for the home master

Builder, home master

The wires of electrical appliances, having a large length, are more convenient to keep rolled into a coil. And to fix them in this position, you can make a special clamp. For example, from a strip of fabric, at one end of which a button is sewn, and at the other there is a series of holes for it.

Having fastened such a "strap", you do not have to fear that the wire or hose will unwind.

For a large skein, it is better to use two or three clamps, applying them from different sides. Under a thin wire, you can use a suitable old watch strap as such a latch.

Collar for skein

Author: D.Lekomtsev

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Glasses developed by scientists from Stanford University (USA) will help a billion people suffering from presbyopia - "senile myopia". The smart lenses, dubbed autofocal, are equipped with new software that allows them to automatically focus, according to the university's website.

Presbyopia is an eye disease in which a person cannot see fine print or small objects at close range. This "senile myopia" affects the organs of vision of almost every person - starting from 40-45 years old. The reason for the anomaly, as it is now believed, is that over time the lens of the eye loses its elasticity, and the ciliary muscle responsible for focusing weakens. For some people, reading glasses are enough to overcome the difficulties caused by the disease, but for many people, the only solution, other than surgery, is to use progressive glasses.

Conventional glasses with progressive lenses, however, also have disadvantages. For example, in order to focus correctly, their owner needs to align their head. Imagine that you are driving a car and look in the side mirror to move into another lane of the road. Progressive lenses have either very little or no peripheral focus. The driver must move their eyes away from the road they are facing forward through the top of the goggles and then turn almost 90 degrees to see the nearest mirror through the bottom of the lens. This visual shift can make it difficult to navigate the world, lead to accidents, injuries.

Smart glasses work in much the same way as the lens of the eye. The lenses are filled with liquid: they become convex or flat as the field of view changes. They are also equipped with eye-tracking sensors that determine where a person is looking and calculate the exact distance to the desired object. The team did not invent these lenses or eye-tracking devices, but developed a software system that uses eye movement data to keep the fluid-filled lenses in constant and perfect focus.

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