Since 1981, these disks began to advance and now it is not only a device for storing information for computers, and discs with your favorite music or your favorite movies.
And here is how to make these disks on an industrial scale and how they put it on these discs says this video.
CD-ROM (eng. Compact Disc) — optical storage medium in the form of a plastic disk with a hole in the center, the process of recording and reading of information is carried out with a laser. Further development of the CD-ROM became a DVD.
The helicopter rotary wing aircraft unit, which are necessary for flight lift and thrust generated by one or more rotors (propellers) driven by an engine or multiple engines. Almost every time the main rotor of the helicopter is equipped with a swash, which moves the center of pressure of the propeller for flight control (with the exception of some schemes with 3 or more rotors).
Snowboarding is a sport that has gained huge popularity in most ski centers all over the world. Similar to skateboarding, plus the unforgettable romantic mountain peaks attracted to this sport more and more people of different ages.
One of the most popular Soviet postwar trucks became the GAZ-51 or, as it was called drivers, is “lawn”. Released in 1946, this 2.5-ton vehicle became the basis for many specialized vehicles — trucks, tractors, vans, tankers, cranes and buses. However, as time went on, and won the national love the truck gradually handed over their positions — the country needed a more powerful, higher gross weight and higher speed machine.
