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Antique French spectroscope. 1900

Antique French spectroscope. Possibly from a school or university. 1900

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Antique French spectroscope. Possibly from a school or university laboratory. One lens is missing. 1900. The optical spectrometer, or spectroscope, is an instrument used to measure the properties of light in a particular portion of the electromagnetic spectrum. The variable usually measured is the intensity of light but the state of polarization can also be measured.