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 Abbot René-Just  Haüy

Saint-Just-en-Chaussée (Oise) 28.February.1743- Parigi 03.June.1822

1794 Piezoelectricity
He studied the structure of crystals, the magnetic properties of minerals such as magnetite, chemical composition and physical properties of minerals and electrical properties of the same.  From here the discovery of the properties' PIEZOELETTRICHE 'of some crystals. Piezoelectric crystals are used in a variety of uses one of which is the construction of heads of turntables for reading the microsolchi vinyl discs.