National Geographic : 1957 Sep
() National Geographic Society 353 Rawin Set's Big Ear Listens to Signals from High-flying Weather Balloons United States stations in Antarctica use these radio direction finders to pick up messages from weather balloons. The shieldlike parabolic reflector tracks the gas-filled bag from ground level to bursting altitude and intercepts data flashed by the balloon's radiosonde transmitter. Ribbed dome of translucent plastic permits free passage of trans mitter's signals. Electronics technician Paul K. Barger services this unit at McMurdo Sound.