Production of glass_1; Glass is made from certain salts; sand particles and ashes by melting in a fire. The raw materials are melted in the kiln and the resulting pieces are shredded afterwards; woodcut; p. 471; (Liber duodecimus); Manuel; Hans Rudolf (graveur sur bois); 1556; Georgius Agricola: De re metallica libri XII: quibus officia; instrumenta; machinae; ac omnia denique ad metallicam spectantia; non modo luculentissime describuntur; sed & per effigies (...). Basileae: [Froben]; 1556.