| 11. | The first four Sirius spacecraft used more traditional parabolic reflectors.
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| 12. | The reflector is a spherical reflector, not a parabolic reflector.
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| 13. | Hunstanton lighthouse had the world's first parabolic reflector which was built here in 1776.
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| 14. | It was lighted by five whale-oil lamps with parabolic reflectors.
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| 15. | Parabolic reflectors are popular for use in creating optical illusions.
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| 16. | Sunlight is focused by means of a parabolic reflector dish on a black pot.
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| 17. | Three single-wick lamps fitted with parabolic reflectors were used.
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| 18. | Nevertheless, it is easily distinguished from a parabolic reflector by its flat or tube shape.
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| 19. | This greatly reduces the system s cost since sagged-glass parabolic reflectors are typically very expensive.
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| 20. | During the early 1940s mortar rounds easily deformed the parabolic reflectors, rendering the wave amplification ineffective.
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