Newland D.

This paper reports the results of further experiments on tower bell audibility. It follows on from the author's first paper on this subject at ICSV12. After a year's use, the new tower bells at Kettering, England, have been tested again for audibility. This time the experiments have included ringing some bells at different swing amplitudes, as well as repeating experiments for each of the 12 bells ringing steadily at its full amplitude. Also preliminary calculations have been made on the dynamic interaction which occurs between a bell and its clapper (the hammer that strikes the bell). These calculations support the recent findings by others that the extent to which a hammer bounces on the rim of a bell significantly affects that bell's audibility. The work is part of a continuing collaborative research programme in the Cambridge University Engineering Department.