| 21. | Using his 11 inch Clark Brothers photographic refractor he took a 50-minute exposure.
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| 22. | The Carnegie twin refractor is located in a mid-sized dome at the observatory.
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| 23. | It boasted of an 8 " Cooke Astrograph and a 15 " Grubb refractor telescope.
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| 24. | It houses the double refractor, two 0.33 meter refractor telescopes mounted together.
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| 25. | It houses the double refractor, two 0.33 meter refractor telescopes mounted together.
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| 26. | The Observatory houses a magnificent refractor built by Howard Grubb ( Grubb Telescope Company ).
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| 27. | His first telescope, a tiny 2-inch refractor, was a childhood Christmas present.
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| 28. | Meade offers a beginner's refractor ( Meade NGC-60 ) for $ 200.
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| 29. | During the early 20th century this contained a 22-inch ( 56 cm ) refractor.
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| 30. | The refractor was the last great telescope from Fraunhofer, that was still available in M�nchen.
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