| 21. | Diversifying from just being opticians, they also traded in all manner of optical instruments.
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| 22. | In it they gave no documentary evidence of optical instruments.
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| 23. | A number of pieces from his optical instrument collection were placed on display there.
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| 24. | Flakes of paint could contaminate optical instruments on the Hubble.
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| 25. | Dresden was historically a center for electrical engineering and the manufacture of optical instruments.
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| 26. | They sold mathematical, physical and optical instruments, particularly glasses.
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| 27. | This required the use of multiple optical instruments both on the ground and in space.
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| 28. | He began manufacturing Hadley's quadrant ( a predecessor to the sextant ) and optical instruments.
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| 29. | "It's a very precise optical instrument, " he said.
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| 30. | The Museo di Fisica e Storia Naturale of Florence commissioned several optical instruments from him.
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