| 21. | Hydrogen atoms like this are found in stars but also in objects like arc lights.
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| 22. | Arc lights have mainly been used where high lumen light was needed such as lighthouses.
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| 23. | Conventional halogen bulbs, argon lasers and xenon arc lights are currently used in clinical practice.
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| 24. | The school is named for Charles F . Brush, the Ohio-born inventor of the arc light.
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| 25. | Odlum may have installed the first public telephone in Vancouver and the first electric arc light.
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| 26. | Arc lights need carbon electrodes called carbon points ( or simply carbons ) to work.
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| 27. | By 1811 Davy demonstrated the arc light.
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| 28. | The first " Klieglight " was a powerful carbon arc light designed for the motion picture industry.
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| 29. | Daniels sometimes used incandescent lights instead of studio arc lights, due to the constraints of his locations.
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| 30. | But they are vastly more complicated and depend on microcomputer technologies and powerful xenon arc light sources.
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