Illustration of a specially designed furnace used to repair a cracked bell by welding. From Vannoccio Biringuccio (Italian, 1480–before 1539), The Pirotechnia, 1540. See Biringuccio, Vannoccio. (1540) 1942. The Pirotechnia of Vannoccio Biringuccio. Translated by Cyril Stanley Smith and Martha Teach Gnudi. New York: American Institute of Mining and Metallurgical Engineers., 276.