Luchnikov's loop. Tourist tips

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Luchnikov's loop. Tourist tips

Tourist tips

Some knot experts call archer noose "Turkish knot". This is one of the oldest and most amazing knots ever invented by man. It has a specific purpose - to regulate the tension of the bow string.

As you know, the string of almost any bow never remains the same tension. It, especially if it is made from animal tendons, strips of leather or plant fibers, can lengthen or shorten for various reasons, for example, air humidity and temperature.

The bow itself can change its properties, be it made of wood or animal horns. The bow lay overnight on the damp ground - the bowstring became taut, the hunter sat with a bow by the fire - the bowstring weakened, etc. In a word, it often had to be adjusted, and this was done not so much by bending the bow itself, but by using a special additional vein with one end of the bow.

Rice. 116. Luchnikov's loop (the working loop is marked with a cross)

Author: Skryagin L.N.

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Giant accumulations of turbulent gas discovered in distant galaxies 04.09.2017

The European Southern Observatory (ESO) reports that researchers have found turbulent clumps of cold gas around distant starburst galaxies.

The observations were carried out using the ALMA (Atacama Large Millimeter/submillimeter Array) system of millimeter and submillimeter radio telescopes. In the course of the work, scientists discovered CH + molecules for the first time, which opens up a new direction for studying the critical epoch of star formation in the Universe.

"CH + is a special molecule. It requires a lot of energy to form, in addition, it is very chemically active, which means that it must be short-lived and unable to be transported over long distances. Therefore, the presence of CH + allows us to trace the trajectories of energy flows inside galaxies and in their vicinity", the researchers say.

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