"With patience he went into the question, using the telescope as well as a very narrow slit... Close examination was rewarded by the making out of lines upon lines; till in the year 1814, that which witnessed the downfall of Napoleon and his banishment to Elba, Fraunhofer had mapped three or four hundred."
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Agnes Giberne, Radiant suns (1894) Note: see spectrometer
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Joseph von Fraunhofer
Joseph Ritter von Fraunhofer (6 March 1787 – 7 June 1826) was a Bavarian physicist and optical lens manufacturer. He made optical glass and achromatic telescope objective lenses, invented the spectroscope, and developed diffraction grating. He also discovered and studied the dark absorption lines in the spectrum of the sun now known as Fraunhofer lines.
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