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Spectroscope

A spectroscope is a device which measures the spectrum of light. Early spectroscopes were simply a prism with graduations marking wavelengths. Modern spectroscopes generally use a diffraction grating, a movable slit and some kind of photodetector[?], all automated and controlled by a computer.

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Reformed churches

... under which the Reformed church was protected until until 1628, when La Rochelle, the protestant center of resistance to Louis XIII[?], was overrun by a French army ...