Man the main and natural light source is the sun; the giant, burning mass, the produced illumination of the solar system, the earth included, along with heat and radiation. Our consciousness is not in doubt that the sun is in the center and stationary in the system. Also, the Rotation on its own axis and revolution about the same sun, the earth and other planets, would intuitively the availability of the lighting vary. Thus day and night originated.
IN THE BEGINNING WAS THE LIGHT
Thousands of years before science was organized, was discovered in a fire. There had been “minor suns” because of the heat and light. The fire is extinguished, however, if it is, the maintenance or exhausted. Without a doubt, a large problem with the “artificial light” is his food. Starting with a lot of damp and localized materials, began the human solutions to this problem; “artificial light”, it should take longer. There is no discussion about fuels here, mind you.
WHO DID WHAT?
Thomas Edison is often recognized for his work in artificial light. However, the books of history that he actually does not the bulb, but the first commercially practical light bulb, invent. Many great scientists and inventors had worked on the artificial light in front of him. Edison interesting 1000 times attempts to power his side of the story of the “artificial light” which are more interesting than others. It was and still is, very motivating.
Sir Humphry Davy invented The “arc lamp”, with a red-hot carbon; the light was too weak and did not last long enough. The was invented the first “electric light”, in the year 1802, with carbon as the filament. In 1840, platinum was used as the filament by Warren de la Rue. It worked efficiently. In fact, the longevity has been improved, since platinum could be the operating at high temperatures But it was a big problem; the commercial production was not feasible because of the high cost of platinum.
THE PROBLEM IS, THE FILAMENT
It is not an argument in this case, as always, the right filament was the crux of the problem. The filament is the part of the device that produces the light. When electric current passes through the filament; it glows. This glow is due to the heat generated by the filament, the high resistance to the flow of electric current.
It is an element that would fit had to conditions, the beautiful by the combination of the technical and commercial. Carbon filament could be irritating black pipes and not lasted long. Platinum is not economical because of its high cost. Although, it might suffer in heat, a quality that would be necessary for the production of light -, market price is never friendly.
Edison and his team filament also improvised with carbonized bamboo could last over 1200 hours. It was the beginning of commercially produced light bulbs, and the education of Thomas Edison company; Edison Electric Light Company in 1880. The company marketed the new product. That was never the end of the story.
TUNSGTEN HAS THE MAGIC
This is awkwardly interesting. Edison himself, knew that Wolfram would be good as a filament for incandescent lamps, but he had no means of refining the element. Anyway, tungsten is the magic! Another company, General Electric, had one of their scientist, William David Coolidge, worked on tungsten and made the best filament for light bulbs.
Why Tungsten? Tungsten has a higher melting point of approximately 3422 degrees Celsius. For a typical light bulb, the tungsten filament operates at approximately 2500 degrees Celsius. Its boiling point is about 5555 degrees Celsius. Its density of 19.25 g/cubic-cm. In addition, it does not cost as high as platinum, which makes it economically relevant.