The likely shape of the bells was determined through consultation with several bellringing experts at the Tower of London. Transcripts of those interviews are available in Appendix VII.

"Thorough Analysis", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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The likely shape of the bells was determined through consultation with several bellringing experts at the Tower of London. Transcripts of those interviews are available in Appendix VII.