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Hilger, Adam | Spectrometer Camera | Other | Quarter Plate

1900. A wavelength spectrometer camera made by Adam Hilger of London, who specialised in making instruments with scientific and industrial applications. In use, the camera is attached to a spectrometer, which measures the angle that light is refracted when passing through a prism. The instrument is used to examine the chemical composition of a substance that has been vaporized in a hot flame, the camera recording the wavelengths that have been absorbed, by taking a spectrograph. The angular displacement of the spectrum is determined by measuring the photographic plate. This camera is missing its bellows, but it is very rare and historically important, and this is the only one I have seen outside of a museum.

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