Spectroscope Small 320×317 Medium 640×635 Large 1024×1016 Download TIFF Original 2420×2400 | (277.1 KB) Description "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 Keywords collimator, light, physics, prism, science, spectrum, telescope Galleries Miscellaneous Optics Source: Finley, John H. Nelson's Perpetual Loose-Leaf Encyclopedia (New York City: Thomas Nelson and Sons, 1917) 11:362
