"By his invention of new and improved methods, machinery, and measuring instruments for grinding and polishing lenses, by his having the superintendence, after 1811, also of the work in glass-melting, enabling him to produce flint and crown glass in larger pieces, free of veins, but especially by his discovery of a method of computing accurately the forms of lenses, he has led practical optics into entirely new paths, and has raised the achromatic telescope to, until then, undreamed of perfection."
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E. Lommel, preface to Joseph von Fraunhofer's Gesam melte Schriften [Entire Lection of Writings] (1888) as quoted by Florian Cajori, A History of Physics in its Elementary Branches (1917)
https://en.wikiquote.org/wiki/Joseph_von_Fraunhofer
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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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