Abstract
THERE are several ways of obtaining a knowledge of the free air: the observer himself may go up in a balloon and take readings of his instruments; or he may send up recording instruments in a kite, a captive balloon, or a free balloon; in the latter case, he must take the chance of the balloon and the instruments being found after they come to earth.
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Upper Air Research 1 . Nature 93, 334–338 (1914). https://doi.org/10.1038/093334a0
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DOI: https://doi.org/10.1038/093334a0