Before revision: The tonograph () is a device invented by Italian scientist Luca de Samuele Cagnazzi (1764-1852) and presented at the Terza riunione degli scienziati italiani (the "Third meeting of Italian sientists "), held in Florence in September 1841.
After revision: The tonograph () is a device invented by Italian scientist Luca de Samuele Cagnazzi (1764-1852) and presented at the Terza riunione degli scienziati italiani (the "Third Meeting of Italian Scientists "), held in Florence in September 1841.