ответьте на во к тексту.
1. When did the primitive lamp disappear?
2. What was in fact the first searchlight?
3. Who was the first to discover the electric arc?
4. Why did his discovery remain unknown in the West?
5. What was the subject of Yablochkov's report to the Paris Academy in 1876?
6. Who made the first successful incandescent lamp?
7. Can you explain the difference between his lamp and Edison's one?
8. What kind of filament is used nowadays?
9. What achievement was based on the research of S. Vavilov?
10. What are advantages of the artificial daylight lamps?

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