Abstract
The radiosonde, the most recently developed tool for use in the investigation of phenomena in the upper atmosphere, is described. The various merits and disadvantages of the three systems now in use for the transmission of physical data from the stratosphere are reviewed.In a discussion of present-day radiosonde technique are included descriptions of transmitters, receivers, meteorological and other observing instruments, and ballooning methods. Their application to the study of cosmic rays is given as a typical illustration of their usefulness in fields other than meteorological. A new formula for the upward velocity of a flight in terms of its free lift is developed, which shows that the observed constant rate of ascent of pilot type balloons is fortuitous, depending on a particular range of values of the Reynold's Number of the balloons.
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