During the French Revolution nine bells were taken out and melted down to make cannon, but the "Totonglock" and a second bell, the "Zehrnerglock" (1.58 meters, 2.225 tons), made in Mathieu Edel in 1786, were preserved to ring the hours and serve as alarm bells for the city. More recently, a group of seven modern bells was cast in Heidelberg between 1974 and 1976; they range from 1.7 meters to 0.9 meters in diameter, and from 3.9 to 5.7 tons in weight.