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A low-temperat ure patch Lest for sounding· balloons is described. In t hi s Lest a cil·eular piece is cut out of the rubber film , clamped around its circumference, and inflated un til it bursts. Equations applying to the patch test and to the flight of soundin g balloons arc dev eloped. Th e important properties in determining the flight elevation are found to be the flaccid length of the balloon and the elongatiQl1 ciJ the rubber film. The effecti,·e elongat ion is defined as the averagedoi:10.6028/jres.053.048 fatcat:5nqjzo4rqvednkkb4krd2euvva