Lamps

The history of the development of the lamps is amazing!.. The cave man's house was lit by a bonfire. Outside the cave used burning buns. Later the beetles were replaced by torches - sticks with recesses for resin. They illuminated the streets and gloomy castles of feudal lords in the Middle Ages. In the era of antiquity, the Greeks appear oil lamps - clay or metal "teapots" with oil, through which the wick misses the wick.

The history of the development of the lamps is amazing!

Lamps have been smoked for many centuries, because the lamp glass was invented only in the second half of the 18th century. The candle was invented in Ancient Rome about 2 thousand years ago. At first, they were plant fibers, impregnated with resin and covered with wax. In the 10-11th centuries, wax and tallow candles began to be made. How were tallow candles made? We lowered the wick in the melted butter, took it out and waited until the oil froze. And so several times. The candle burned so badly and it smelled disgusting. In the Russian hut up to this century in the cottages burned a ray - a thin dry sliver. It was strengthened over a trough with water, where the embers fell. The whole structure was called "light". In the mid-19th century, oil began to receive kerosene, then the kerosene lamps appeared. At the same time, gas was mastered, and gas burners entered the household. Especially bright gas lamps. The glowing mesh cap made of refractory metals glows in them. These lamps survived until the 30-ies of the last century. There were spirtokalilnye lamps, they burned alcohol.

In 1802, Vasily Petrov made an astonishing discovery: if the tips of the coal rods are brought together and the current is passed, a blinding curved flame, an electric arc, will flash between them. In 1949, the Russian academician B.S. Yakobi installed the first arc lamp on the Admiralty tower. However, the carbon rods are constantly burned. The scientist P.N. Yablochkov guesses to put the rods side by side, a column, and lay between them an insulator that does not pass current. In 1876, the "candle Yablochkov" conquers the whole world. At the same time, the first electric incandescent bulbs appear.

But the history of the lamp does not end there. About a quarter of a century ago, halogen lamps were created. They are filled with couples iodine, which causes the evaporated tungsten again deposited on the yarn. They do not burn out and their brightness increased threefold. In the middle of the last century it was noticed that some gases in a glass tube glow under the influence of current. The first gas-discharge lamps were created in the 1920s of the 19th century. And in 1938 Academician S.I. Vavilov invented fluorescent lamps (daylight). The glass tube is covered with a special compound that glows under the influence of electricity. Unfortunately, this lighting is pretty bad for the eyes.

And relatively recently in the house of man appeared unusual lamps. From the lamp, hundreds of transparent hairs diverge in all directions. These are light guides. Light runs through them like water on a hose. Light guides were known a century ago, but only now they began to conquer the world.

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