| Postal Stamp Image |
: |
 |
| Stamp Issue Date |
: |
21/10/1979 |
| Postage Stamp Dinomination |
: |
1.00 |
| Postal Stamp Serial Number |
: |
0946 |
| Postal Stamp Name |
: |
EARLY & MODERN LIGHT BULBS |
| Stamp Information |
: |
Thomas Alva Edison, U.S. inventor, best known for his development of the photograph and the incandescent lamp, was even more notable for the wide range of his interest.
He was born in Milan, Ohio, on February 11, 1847. He was experimenting for some time with what he called "electric lamp for giving light bu incandescence.: On October 21, 1879, in his laboratory in Menlo Park, New Jersey, after spending more than $ 40000 in fruitless experiments, he finally succeeded in making an incandascent lamp in which a loop of carbonized cotton thread glowed in a vacum glass bulb for more than 40 hours. He himself described the event as "the sight we had so long desired to see met our eyes." The following decade was devoted to the invention and exploitation and methods for the generation and distribution of electricity, including the three-wire system.
In his life time of 84 years (he died in 1931), he patented over 1000 inventions which changed our way of living. In 1883 he patented what became known as the "Edison effect", the passage of electricity from a filament to a plate of metal inside an incandescent lamp globe (a forerunner of the elecron tube).
His invention of the electric bulb, in a way, revolutionalized the technical and social development of mankind. This small ubiquitous device which is so familiar today, is really a gift to the humanity by this great scientist, who worked hard to continuously improve its performance ever since its invention.
In the course of years, the method of production of electric bulb has developed from manual techniques to a completely mechanical activity in order to carter to the ever increasing demand all over the world, and, as a result of it, a new great break-through was achieved an indascent lamp technology with the halogen lamp having a luminous eficacy of 20 to 30 lumens per watt.
In an indirect way, the incandascent lamp has been the motive power behind all further development in the industrial and domestic use of electricity. The fact that radio valves were derived originally from the incandascent lamp, confirm the origin of electronics and its later development as well. The electric lamp, without doubt, has brought 'Light for everybody' and is still doing so!
The Posts and Telegraphs Department feels privileged in honouring Thomas Alva Edison by issuing a special postage stamp commemorative the invention of electric light lamp by him one hundred years ago. |
| Stamp Currency |
: |
R |
| Stamp Type |
: |
COMMEMORATIVE |
| Stamp Language |
: |
English |
| Stamp Overall Size |
: |
3.91 X 2.90 cms |
| Postal Stamp Print Size |
: |
3.55 X 2.5 cms. |
| Number of Stamps Per Sheet |
: |
35 |
| Stamp Perforations |
: |
13 x 13 |
| Postal Stamp Shape |
: |
Vertical |
| Postage Stamp Paper |
: |
Unwatermarked adhesive stamp paper |
| Indian Stamp Process |
: |
Photogravure |
| Number of stamps printed |
: |
20,00,000 |
| Stamp Printed At |
: |
India Security Press |
| Indian Stamp's Color |
: |
Red Purple |
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