Whispering-gallery phenomena at St. Paul's cathedral

Abstract

We were much interested in the subject, and by the courtesy of the authorities of the cathedral have been enabled to carry out an extended series of observations in the gallery with the view of making a precise test of Lord Rayleigh's theory. Our experiments show conclusively that while the indication of theory as expressed in (a) is substantially accurate, neither of the conclusions (b) and (c) is in accordance with actual facts.