Meteorologists test a helium balloon carrying a radiosonde, a recording instrument, planning to track its movements with a surveying instrument called a theodolite, 1920s.A radiosonde, which came into use in the 1920s and 1930s, was and is a small boxy instrument sent aloft to measure temperature, humidity, and air pressure. Carried by a balloon, this one sent continuous signals while its movements were traced to determine wind direction and speed. When the balloon burst, the radiosonde parachuted back to Earth.
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