the production of a bell (bell casting) is an incredibly fascinating as well as complex and exhausting process. on the week-end i watched an extensive tv-documentation about the activities at the eifeler glockengiesserei mark. in the end there was a bell weighing 7 tons and being tuned exactly to the tones as calculated in the beginning.

classic papers on bell tuning.

"there are many bells so radically wrong that there is nothing to be done with them except 'put up with' them, or send them to the melting-pot." – a. b. simpson, on bell tones no. ii.