Character of Atmospheric lonisation

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IN recent months an apparatus has been set up at Kew Observatory for investigating atmospheric ionisation. A continuous record is taken of the ionisation currents to the central electrodes of three cylindrical condensers, through which air is aspirated. The outer cylinders of the condensers are maintained at three different voltages, which are automatically reversed in sign every five minutes, so that positive and negative ions are alternately collected by the central electrodes. The ionisation currents are recorded photographically on bromide paper by light reflected from the mirrors of three Dolezalek electrometers. The mouths of the condensers project through the wall of a hut and are 10 cm. apart from each other. The mean height above the ground, a grass lawn, is 1.5 metres.

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SHEPPARD, P. Character of Atmospheric lonisation. Nature 129, 169 (1932) doi:10.1038/129169a0

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