Word: grounds
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Dates: during 1930-1939
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Doing a smart 38 m.p.h. with wide open throttle the craft was just clearing the trees on the edge of the field, when a disagreeable down draft went to work. The ship poised for a moment, then pancaked into a large tree some 15 or 20 feet off the ground...
...lonosphere Observatory of the University, after a four-year shutdown, has resumed its radio investigations of the little-understood deep blankets of atomic particles which surround the earth's atmosphere a hundred or so miles from the ground, and which enable long-distance wireless communication...
Phenomena found to affect the ionosphere are auroral displays, and terrestrial magnetic disturbances. An apparent close connection between radio wave propagation and weather conditions on the ground is being investigated by the Blue Hill Meteorological Observatory of Harvard, in cooperation with the radio engineers...
...roads lead to Rome, and all final examination and course grades lead the students hot on their trail to University Hall. But that ground is hallowed now, and no sleuth may legally apprehend his prey thereon...
From 2 until 6 o'clock flights were in progress in the three groups of models; gliders, hand launched; fuselage ships, hand launched, and fuselage ships, launched from the ground under their own power...