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grating spectroscope OPTICS

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English
The products he designed and manufactured included spectroscopes, telescopes, microscopes, barometers, photometers, cameras, ophthalmoscopes, and electrical equipment such as electric lamps.
en.wikipedia.org
He also created celluloid diffraction grating replicas, polarising solar eyepieces and prominence spectroscopes that were widely used, as well as objective prisms.
en.wikipedia.org

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