Word: minitrack
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Dates: during 1960-1969
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...drum record radiation from both sun and sky as the drum spins, and a neutron counter catches neutrons bounced up from the earth's atmosphere by the impact of cosmic rays. All the readings are recorded on tape during each orbit. When OSO passes over a Minitrack radio station, it is given a signal that makes the tape reverse its motion and quickly send its data down to earth...