Penn State Researchers Model the Liberty Bell’s Lost Sound
Penn State researchers used a replica to model the Liberty Bell’s acoustics, offering an estimate of how it sounded before a crack left it silent for 180 years.
The Liberty Bell, which has a famous crack, has not been rung in 180 years. Historians do not know exactly when the bell acquired its distinctive crack, only that it happened sometime between 1817 and 1846. An 1846 account in the Public Ledger described the ringing of the bell on February 23 of that year and mentioned that the bell had developed a crack, which someone had attempted to fix by filing the sides down. The repair failed. The February 23 ringing extended the crack even more, so much so that, as the account put it, “the old Independence Bell... now hangs in the great steeple irreparably cracked and forever dumb.” Nobody has heard it ring since.
The crack that silenced the bell was not its first. The rim cracked shortly after the bell arrived in Philadelphia in 1752, the very first time the clapper struck while the bell was being tested for its sound. Two local foundry workers, John Pass and John Stow, recast the bell twice. The first recast produced a sound that one bystander likened to coal scuttles banging together.
The Penn State modeling drew on data from a replica to reconstruct acoustic properties that cannot be directly tested on the original. According to Ars Technica, the research offers an estimate of what the Liberty Bell might have sounded like before it was permanently silenced.