| 21. | The original light was an Argand-Lewis parabolic reflector, lit with candles and with a visibility of.
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| 22. | Greater directionality can be obtained using beam-forming techniques such as a parabolic reflector or a horn.
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| 23. | Two 2.4-meter parabolic reflectors ( one transmit and receive ) mounted on a converted Flak mounting.
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| 24. | Hertz placed dipole antennas at the focal point of parabolic reflectors for both transmitting and receiving.
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| 25. | Around 1763, William Hutchinson installed what may have been the first parabolic reflector in a lighthouse.
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| 26. | A Sony parabolic reflector, without a microphone.
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| 27. | A parabolic reflector focuses an arriving plane wave on one or a small subset of feed elements.
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| 28. | The original optical apparatus was a catoptric system consisting of 21 oil wick lamps with parabolic reflectors.
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| 29. | At night, the red steamer lamp with parabolic reflector was raised on rails to a height of.
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| 30. | This uses a single-lens system, fed by three or four individual halogen lamps with parabolic reflectors behind them.
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