A study was mad e of the app licab ili ty of a number of metals and a lloys for therm a ll y stable ultrasonic delay lin es. A preliminary iavestigation was made of different types of press ure holders and adhesi ves for use in crystal t ra nsdu cer attachments and of the iaflu ence of specimen length on atten uation for valious m etals and alloy. The e ffect of cold-work, annealin g, and sp ecimen cross section on attenuation was a lso determined for a representati ve isoelastic alloy. M eas

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... em ents of temperature variation of signal attenuation, distort ion, a nd d elay t im e on a number of assembled delay lines indicated t hat an isoelastic a lloy empl oying over cured ep oxy-resin crystal attachments gave best over-all t ransmission characteristics. No correlation was obtainable between strength and SOLl nd-transmission characteristics wi th varioLls cemented join ts.