Pierre-Louis Guinand

Born20 April 1748 (1748-04-20)

La Sagne, Principality of Neuchâtel

Died13 February 1824 (1824-02-14) (aged 75)

Les Brenets, Canton of Neuchâtel

Spouses

• Élisabeth Bourquin (née Jacot)

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  (m. 1770; died 1771)​
• Marie-Madelaine Jean-Richard-dit-Bressel

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  (m. 1771; died 1781)​
• Marie-Anne Masson (née Jeannot)

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  (m. 1783; div. 1798)​
• Rosalie Bouverat

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  (m. 1806)​

Fields

• Carpenter
• watchmaker
• optician

Pierre-Louis Guinand
Lithograph by Étienne-Ovide Domon (1844)
Born	20 April 1748 (1748-04-20) La Sagne, Principality of Neuchâtel
Died	13 February 1824 (1824-02-14) (aged 75) Les Brenets, Canton of Neuchâtel
Spouses	Élisabeth Bourquin (née Jacot) ​ ​ (m. 1770; died 1771)​ Marie-Madelaine Jean-Richard-dit-Bressel ​ ​ (m. 1771; died 1781)​ Marie-Anne Masson (née Jeannot) ​ ​ (m. 1783; div. 1798)​ Rosalie Bouverat ​ (m. 1806)​
Scientific career
Fields	Carpenter watchmaker optician

Pierre-Louis Guinand (1748–1824) was a Swiss lens maker.^{[1][2][3][4][5][6][7][8][9][10][11][12]} who in the late 1700s came up with a breakthrough for making better quality and larger glass, and in time went on to teach a young Fraunhofer at Joseph von Utzschneider's (1763-1840^[13]) glassworks, and eventually started his own optical glass works.^[14] Guinand would supply glass for the Paris Observatory telescopes and also Cauchoix.^[14] He was a pioneer in the manufacture of optical glass for microscopes, telescopes, glasses and other optical instruments.