Analysis of information sources in references of the Wikipedia article "Markree Observatory" in English language version.
Between 1784 and 1790, Pierre Louis Guinand, a Swiss craftsman, taught himself the basic skills of glassmaking and began to experiment with optical glass.
Methods of making large disks of flint glass were discovered in the late 18th century by Pierre Louis Guinand (1748–1824), a Swiss optician, who became associated with the German optician and physicist Joseph von Fraunhofer.
SPIE Proceedings (Large Lenses and Prisms - London, United Kingdom Tuesday 27 March 2001)
One of the first Swiss known to have endeavored in optics production, Pierre-Louis Guinand (1748—1824) was an amateur telescope maker. He was born in La Sagne in the state of Neuchâtel. As good quality flint glass was difficult to obtain at the time, Guinand put himself to the task of producing it. After painstaking searches and trials, he succeeded in producing flawless flint glass of large dimensions.
SPIE Proceedings (Large Lenses and Prisms - London, United Kingdom Tuesday 27 March 2001)
SPIE Proceedings (Large Lenses and Prisms - London, United Kingdom Tuesday 27 March 2001)
