Signal Corps Using Theodolite, 1918
Signal Corps meteorological students Keyte and Arnold practicing using theodolite to observe weather balloon azimuth and angular altitude. College Station, Texas A&M 1918. The Signal Corps is a branch of the army responsible for military communications, meteorological studies, and related work. A weather ballon is a balloon used to carry instruments aloft to gather meteorological data in the atmosphere. Weather balloons are tracked by radar, Global Positioning System, or theodolites. A theodolite is an optical instrument used to measure angles in surveying, meteorology, and navigation. In meteorology, it is used to track the motion of a weather balloon by measuring its elevation and azimuth angle. The earliest theodolite consisted of a small mounted telescope that rotated horizontally and vertically; modern versions are sophisticated computerized devices, capable of tracking weather balloons, airplanes, and other moving objects, at distances of up to 20,000 m (65,600 ft).
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Photo credit: © Photo Researchers / Alamy / Afripics
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