What is the fastest fish? Detailed answer

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What is the fastest fish? Detailed answer

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What is the fastest fish?

The speed diving record holder is the swordfish. An adult of this large and very strong fish grows up to 6 meters and has a mass of more than half a ton. The swordfish moves at the speed of a hurricane - up to 130 kilometers per hour! She has a terrible weapon - a sharp sword formed from the fused bones of the upper jaw.

Swordfish more than once terrified sailors and fishermen, attacking sailing ships and even warships and piercing the hulls of fishing boats with a sword.

At the end of World War II, the English tanker Barbara was attacked by her. A one and a half meter sword pierced the skin and got stuck there. However, the fish managed to pull out the sword and rushed into a new attack. She was about 5 meters long and weighed 660 kilograms.

Author: Kondrashov A.P.

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What did the first guns look like?

The first samples of small arms appeared in the fourteenth century. They were known as hand cannons. They had copper and iron pipes (barrels) closed at the back. On the same side (closer to the butt) a small hole was drilled to ignite the gunpowder inside the barrel. The butt had a recess into which the stock was inserted. The mechanism by which a gun fires a shot is called a lock.

Around 1425, a forked piece of iron was attached to the bed on one side, which held a burning wick. With the help of this device, it was possible to light a charge with a wick. Guns fired in this way were called muskets. The next improvement was a change in the shape of the butt, which began to be beveled, which allowed the shooter to put the weapon to his shoulder and take on the recoil. At the same time, this allowed him to aim while looking along the barrel. Such a weapon was called an arquebus.

Around 1515, the wheel lock was invented. A rough-surfaced steel wheel struck sparks from the flint. The result was sparks that ignited gunpowder on a small shelf connected by a hole with a charge in the barrel. By the end of the 1840th century, flintlock guns were improved to the limit. But the principle of their operation remained the same, and they were used with minor changes until about XNUMX.

In 1807, the "shock" system was invented. Its meaning was that the powder charge was ignited with the help of not a flint, but a primer with a detonating substance, which was hit by a trigger hammer.

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