| 31. | In 1905 he investigated cathode rays together with Wilhelm Wien.
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| 32. | Crookes tubes are now used only for demonstrating cathode rays.
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| 33. | After all, they're both built around a cathode ray tube.
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| 34. | Zworykin described cathode ray tubes as both transmitter and receiver.
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| 35. | Cathode ray tubes are what are used to display the information on your computer.
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| 36. | The early meteorologists had to watch a cathode ray tube.
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| 37. | Electrons were first discovered as the constituents of cathode rays.
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| 38. | Cathode ray tubes ( CRTs ) are considered one of the hardest types to recycle.
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| 39. | Cathode rays are made up of negatively charged particles.
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| 40. | The indicator display consisted of two cathode ray tubes.
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