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Other (page 78)Other tasks. These are the tasks listed 771 to 780. |
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Other (page 78)Other tasks. These are the tasks listed 771 to 780. |
| 1. | H Tav | 5861 |
|
| 2. | c. raj. | 5777 |
|
| 3. | Nasrin 24 T | 5731 |
|
| 4. | Fazil Hashim | 5718 |
|
| 5. | Thinh Ddh | 5557 |
|
| 6. | Alfa Omega | 4681 |
|
| 7. | Djordje Timotijevic | 4549 |
|
| 8. | Mita Kojd | 4525 |
|
| 9. | Jakubovski Vladimir | 4443 |
|
| 10. | Chandu Rajyaguru | 4419 |
XerographyIn 1938, xerography was demonstrated by Chester F. Carlson. With his assistant, Otto Kornei, Carlson used a sulphur coating on a zinc plate, vigorously rubbed with a handkerchief to apply an electrostatic charge. A glass slide was prepared using India ink to write "10-22-38 ASTORIA," then laid on the sulphur surface in a darkened room. After illuminating them with a bright incandescent lamp for a few seconds, the slide was removed. When lycopodium powder was sprinkled on the sulphur surface and blown off, there remained a near-perfect image of the writing. Permanent copies were made by transferring the powder images to wax paper and heating the sheets to melt the wax. Xerox is a term coming from "xerography" which means dry writing and is a trademark. |