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People early discovered the useful properties of fire — its ability to illuminate and warm, to improve on plant and animal food. "Wild fire" which broke out during forest fires or volcanic eruptions, was terrible and dangerous to humans, but bringing fire to the cave man "tamed" him and "put" their service. Since that time, the fire became a constant companion of man and the Foundation of its economy. In ancient times it was an indispensable source of heat, of light, means for cooking, hunting. However, further gains of culture (ceramics, metallurgy, steel making, steam engines, etc.) are required the integrated use of fire.

for thousands of years people have enjoyed the "house fire", supported him from year to year in their caves before they learned to make it themselves with the help of friction. Probably, this discovery happened by accident, after our ancestors learned how to drill wood. During this operation was the heating of the wood and under favorable conditions could occur inflammation. Paying attention to this, people began to rely heavily on friction for making fire.

the Simplest method consisted in the fact that you took two sticks of dry wood, one of which did well. The first stick is laid on the ground and pressed his knee. The second was inserted into the hole, and then began to quickly rotate between your hands. At the same time it was necessary with the power to put pressure on the stick. The disadvantage of this method lies in the fact that the palm of your hand gradually slid down. Had to lift it up and again continue to rotate. Although, at known skill, it can be done quickly, yet because of the constant stops, the process is much delayed. It is much easier to make fire by friction, working together. However, one person kept horizontal stick and pressed on top of the vertical, and the second quickly spun it between his palms. Later vertical stick steel clasp strap, which is moving to the right and to the left you can speed up the movement, and at the upper end for convenience began to take a bone cap. Thus, the entire device for making fire was to consist of four parts: two sticks (stationary and rotating), strap and the top of the cap. In this way it was possible to make fire and alone, if you press the bottom of the knee stick to the ground, and the cap — teeth.

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