"Fraunhofer's secrets of manufacture accompanied him to the grave. His artisanal knowledge was such that, after his death, even the apprentices who worked with him, in the same glass hut and with the same equipment, achieved only limited success in the manufacture of optical glass."
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Myles W. Jackson, Spectrum of Belief: Joseph Von Fraunhofer and the Craft of Precision Optics (2000)
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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