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An illustration of a binocular microscope.

Binocular Microscope

An illustration of a binocular microscope.

"...an instrument which gives a spectrum when the source of the light is in a straight line with the eye—that is, which gives dispersion without deviation—is called a direct vision spectroscope..." —Whitney, 1889

Direct Vision Spectroscope

"...an instrument which gives a spectrum when the source of the light is in a straight line with the…

"The stereoscope is an instrument for illustrating the phenomena of binocular vision, and for producing from two nearly similar pictures of an object the effect of a single picture with the appearance of relief and solidity that pertains to ordinary vision." — Avery, 1895

Stereoscope

"The stereoscope is an instrument for illustrating the phenomena of binocular vision, and for producing…