Abstract
A study has been made of the modes of vibration of three brass cylinders with almond‐shaped cross sections, formed by soldering together two sections of a circular pipe. These modes appear as doublets, with the higher frequency member of the pair having a node at each discontinuity. In uncapped shells, the frequency ratio of the doublet pair decreases rapidly with increasing m (the number of bending waves around the circumference) and less rapidly with increasing n (the number of nodal circles). Frequency splittings as large as 30% were observed in the m = 2, n = 0 mode, indicating a substantial decrease in bending wave velocity at the locations where the shell segments are joined. Measurements on capped shells are in progress. [Work supported by the Pew Foundation.]
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