Spectroscope
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“C. Collimator; P, center of group of prisms; T, telescope; s, slit through which the ray of light enters, R, ray on its progress through prisms to telescope."—Finley, 1917
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Miscellaneous OpticsSource
Finley, John H. Nelson's Perpetual Loose-Leaf Encyclopedia (New York City: Thomas Nelson and Sons, 1917) 11:362
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