Abstract
A description is given of an apparatus for the measurement of the reverberation time of ultrasonic waves in a vessel filled with a liquid. This reverberation time depends upon the absorption of the ultrasonic waves in the liquid, in and near the walls of the vessel and by several other causes. A method, described by E. Meyer to separate experimentally these different causes of absorption, is discussed in detail. The method is used to determine the ultrasonic absorption in water at frequencies near one MHz. Only a small volume of two or three liters of the liquid is needed for the determination. Absorptions as small as 0.1 db/m can be measured with reasonable accuracy.
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