| 1. | The electronic vacuum tubes invented later around 1906 superseded the Crookes tube.
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| 2. | On November 8, 1895, Lenard and Crookes tubes and began studying them.
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| 3. | His early experiments were with Crookes tubes, a cold cathode electrical discharge tube.
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| 4. | Taking an X-ray image with early Crookes tube apparatus, late 1800s.
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| 5. | Cathode rays were discovered by Johann Hittorf in 1869 in primitive Crookes tubes.
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| 6. | Crookes tubes are now used only for demonstrating cathode rays.
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| 7. | The Crookes tube was improved by William Coolidge in 1913.
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| 8. | In 1895, Wilhelm R�ntgen discovered X-rays emanating from Crookes tubes.
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| 9. | It was a cold-cathode diode, a modification of the Crookes tube with a phosphor-coated screen.
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| 10. | Thomson constructed a Crookes tube with a better vacuum.
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