| 11. | Are there any better pictures of the Crookes tube or perhaps a more striking picture?
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| 12. | The many uses for X-rays were immediately apparent, the first practical application for Crookes tubes.
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| 13. | He was a pioneer of vacuum tubes, inventing the Crookes tube which was made in 1875.
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| 14. | Crookes tubes are cold cathode tubes, meaning that they do not have a heated pascal ).
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| 15. | He developed the Crookes tubes, investigating cathode rays.
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| 16. | The Crookes tube is visible in center.
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| 17. | A Crookes tube is a sealed glass container in which two electrodes are separated by a vacuum.
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| 18. | Later experimenters painted the back wall of Crookes tubes with fluorescent paint, to make the beams more visible.
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| 19. | Crookes tubes were unreliable and temperamental.
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| 20. | Slattery devised an improved regulator for the Crookes tubes and communicated these improvements to R�ntgen, who replied with appreciation.
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