Abstract
IN a recent letter1, Mr. R. Naismith gave a brief description of equipment used for ionospheric investigations by the Radio Research Board as a part of the Polar Year programme. The equipment described made it possible to record the relation between the radio frequency of the pulse signals used and the virtual height reached by them in the ionosphere. Records of this type give a measure of the maximum density of ionisation. FIG. 1.
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R. Naismith, NATURE, 133, 66, Jan. 13, 1934.
Gilliland, Bureau of Standards Journal of Research, 11, 561–566, Oct. 1933. Proc. I.R.E., 22, No. 2, 236, Feb. 1934.
NATURE, 133, 57, Jan. 13, 1934.
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GILLILAND, T. Ionospheric Investigations. Nature 134, 379 (1934). https://doi.org/10.1038/134379a0
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DOI: https://doi.org/10.1038/134379a0
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