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Non-Commercial Use
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Category
Optics
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Object type
diffraction grating - reflection
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Maker
Brashear, J. A.; Rowland, H. A., Professor
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Henry Augustus Rowland
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Place of origin
Allegheny City
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Allegheny, Pennsylvania, United States; Baltimore, Maryland, United States
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Baltimore
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Concave Rowland-type diffraction grating on speculum metal
1882-1909 (estimated)