Abstract
Leonard (Tech Report No. 1, Department of Physics, UCLA, June 1950) reported a Q of 760 000 at 56 kHz for degassed distilled water in a 50‐liter glass spherical resonator suspended in a vacuum by piano wires. Using essentially the same technique we observed a very strong mode at 25.37 kHz with a decay rate of 0.67 dB/s. This mode corresponds to a Q of slightly greater than 106 and was exactly semilogarithmic over the entire potentiometer range of 50 dB. Two polar end caps for filling and pressurizing the sphere and an equatorial weld bead were the only departures from spherical symmetry. Otherwise the sphere, a ballast tank from the research submarine ALVIN, is concentric and true to within 0.00254 cm. Degassing time to achieve these results is about 100 h. The structure of the high Q mode is unknown. For cylindrical resonators azimuthal modes yielded the highest Q. The assumption for the spherical resonator is that radial modes yield the highest Q. [This research was supported by ONR, NSF and ARPA.]
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