Today's IQ test ..........

[Ustaad]

wrong ..........

[Sharp]

iam 100% sure that Robert Friedel was invented the BULB ..
if it is wrong then u tell me who invented it ??

[Ustaad]

THOMAS ANDRESON nay sab say pehlay bulb ejaad kia ..................

[Sharp]

Prove it ...

[Sharp]

In addressing the question "Who invented the incandescent lamp?" historians Robert Friedel and Paul Israel [1] list 22 inventors of incandescent lamps prior to Joseph Wilson Swan and Thomas Edison. They conclude that Edison's version was able to outstrip the others because of a combination of three factors: an effective incandescent material, a higher vacuum than others were able to achieve and a high resistance lamp that made power distribution from a centralized source economically viable.

Another historian, Thomas Hughes, has attributed Edison's success to the fact that he invented an entire, integrated system of electric lighting. "The lamp was a small component in his system of electric lighting, and no more critical to its effective functioning than the Edison Jumbo generator, the Edison main and feeder, and the parallel-distribution system. Other inventors with generators and incandescent lamps, and with comparable ingenuity and excellence, have long been forgotten because their creators did not preside over their introduction in a system of lighting.

Early pre-commercial research

In 1802, Humphry Davy had what was then the most powerful electrical battery in the world at the Royal Institution of Great Britain. In that year, he created the first incandescent light by passing the current through a thin strip of platinum, chosen because the metal had an extremely high melting point. It was not bright enough nor did it last long enough to be practical, but it was the precedent behind the efforts of scores of experimenters over the next 75 years until Thomas Edison's creation of the first commercially practical incandescent lamp in 1879.[5] In 1809, Davy also created the first arc lamp by making a small but blinding electrical connection between two carbon charcoal rods connected to a 2000-cell battery; it was demonstrated to the Royal Institution in 1810.

Over the first three-quarters of the 19th century many experimenters worked with various combinations of platinum or iridium wires, carbon rods, and evacuated or semi-evacuated enclosures. Many of these devices were demonstrated and some were patented. [6]

In 1835, James Lindsay demonstrated a constant electric light at a public meeting in Dundee, Scotland. He stated that he could "read a book at a distance of one and a half feet". However, having perfected the device to his own satisfaction, he turned to the problem of wireless telegraphy and did not develop the electric light any further. His claims are not well documented.

In 1840, British scientist Warren de la Rue enclosed a coiled platinum filament in a vacuum tube and passed an electric current through it. The design was based on the concept that the high melting point of platinum would allow it to operate at high temperatures and that the evacuated chamber would contain fewer gas molecules to react with the platinum, improving its longevity. Although an efficient design, the cost of the platinum made it impractical for commercial use.[7] [8]

In 1841, Frederick de Moleyns of England was granted the first patent for an incandescent lamp, with a design using platinum wires contained within a vacuum bulb. [9]

In 1845, American John W. Starr acquired a patent for his incandescent light bulb involving the use of carbon filaments.[10] He died shortly after obtaining the patent. Aside from the information contained in the patent itself, little else is known about him.

In 1851, Jean Eugène Robert-Houdin publicly demonstrated incandescent light bulbs on his estate in Blois, France. His light bulbs are on permanent display in the museum of the Chateau of Blois.

In 1872 A. N. Lodygin invented an incandescent light bulb. In 1874 he obtained a patent for his invention. [11]

In a suit filed by rivals seeking to get around Edison's lightbulb patent, German-American inventor Heinrich Göbel claimed he developed the first light bulb in 1854: a carbonized bamboo filament, in a vacuum bottle to prevent oxidation, and that in the following five years he developed what many call the first practical light bulb. Lewis Latimer demonstrated the bulbs that Göbel had purportedly built in the 1850s had actually been built much later, and found the glassblower who had constructed the fraudulent exhibits.[12] In a patent interference suit in 1893, the judge ruled Göbel's claim "extremely improbable".

[Ustaad]

Sorry it was THOMAS ADISON ............

plz visit ..........

http://wiki.answers.com/Q/Who_create...rst_light_bulb

[habibrahet]

Mr. Ustaad

Aaap yeh bataen kay aap apnay jawab k saath reference kiss ka dain gay?

[Sharp]

to ap site se question dekh ker yhaan per post kerty hain...
wo question poucheen jo ap k mind mean hoon ...

[Ustaad]

Question ..........
DUNIA MAIN SAB SAY PEHLAY SUBMARINE (AABDOZ) KES COUNTRY NAY EJAAD KI .............????????

[Ustaad]

mujhay Pata Tha Already ............. Sirf Aap Ko Prove Denay K Lia Link Dia Hai ..............
Or Yeh Main Nay Abhi Search Kia Tha ...........
Yeh Sooch Kar K Shayed Mian Ghalat Hoon ...........
Lakin Mera Answer Sahe Tha ...........

[habibrahet]

@mr. ustaad
aap ko sab say pehlay yehi jawab diya gya thaa, jisay aap nay wrong kaha.


khair koi baat nahi,
ab yeh bhee mulahiza keejiay


http://wiki.answers.com/Q/Who_invented_the_light_bulb



Answer

Starting in the early 1800s, inventors looked for ways to convert electricity into light. Sir Humphry Davy, an English physician, successfully passed an electric current through platinum strips in 1801. Unfortunately, the strips evaporated quickly and Davy was unable to create a light that lasted more than a few minutes.

In 1809 Davy created what would become known as the Arc lamp. He made an electrical connection between two charcoal rods connected to a battery. The light from this was very bright but small.

For the next 50 years, others sought ways to lengthen the amount of time the light source would remain. In 1840 Warren de la Rue, a British scientist, placed a platinum coil in a vaccum tube. When he passed an electric current through it, light was formed. This design was efficient and the light lasted longer, but platinum was very expensive which made it impossible to be distributed on a commercial level.

In 1841 Frederick de Moleyns of England was given the first patent for an incandescent lamp. His design used powdered charcoal. He heated this material between two platinum wires in a vacuum bulb.

Joseph Wilson Swan
Joseph Wilson Swan was born in 1828 in England. He worked as a physicist and chemist. Swan wanted to produce a practical, long-lasting light source. He used a carbon paper filament in his light bulbs. In 1878 he received a British patent for his light bulb. Swan began placing light bulbs in homes throughout England. By the early 1880s he had started his own light bulb company.

Thomas Edison
While Swan worked in England, Thomas Edison was busy in the United States. He experimented with thousands of different filaments. His goal was to find materials that would light well and last for a long time. He brought in various metals and supplies from all over the world.

Then in October of 1879, Edison had a breakthrough. He carbonized a piece of sewing thread. Using this as a filament, he was able to produce a light bulb that burned for thirteen and a half hours. By bending the filament, he could make the lamp burn for over 100 hours. Eventually Edison invented a bulb that could glow for more than 1200 hours. He received a patent in 1880 for his light bulb. It had the same features of today's modern light bulbs: an incandescent filament in a glass bulb with a screw base.

The Real Inventor of the Light Bulb
When the question is asked, who invented the light bulb, Joseph Swan and Thomas Edison are usually given credit. However, both of these men worked off of previous inventions. Historians estimate that over twenty inventors worked toward the creation and design of the light bulb. Of these, Edison's version was the most efficient.

When studying who invented the light bulb, it is appropriate to credit numerous inventors that lived during the 1800s. Even after Swan and Edison, others continued to improve the light source. The light bulb, as we know it today, is a result of much time and effort.

[habibrahet]

mujhay Pata Tha Already ............. Sirf Aap Ko Prove Denay K Lia Link Dia Hai ..............
Or Yeh Main Nay Abhi Search Kia Tha ...........
Yeh Sooch Kar K Shayed Mian Ghalat Hoon ...........
Lakin Mera Answer Sahe Tha ...........

ager aap ko yeh answer maloom thaa, to 0930 per aap nay pehlay reply ko wrong kyoon kaha thaaa?