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Locomotion
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Locomotion
National Railway Museum
National Science and Media Museum
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Image
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Non-Commercial Use
1
Category
Optics
1
Maker
Brashear, J. A.; Rowland, H. A., Professor
1
Henry Augustus Rowland
1
Object type
diffraction grating - reflection
1
Place
Allegheny City
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Allegheny, Pennsylvania, United States; Baltimore, Maryland, United States
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Baltimore
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Material
metal, cast
1
speculum metal
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Date
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Concave Rowland-type diffraction grating on speculum metal
1882-1909 (estimated)
