Abstract
IT was found for the first time by Clay1 on voyages between Holland and Java that the intensity of cosmic radiation has a minimum in the neighbourhood of the magnetic equator. The extensive survey directed by Compton2 confirmed the existence of this latitude effect and showed it to be more pronounced at higher altitude. More accurate results at sea-level are due to an investigation of Clay and Berlage3. As this again refers to the line from Holland to Java, I thought it would be worth while to perform analogous measurements on a trip from Holland to South Africa. During this investigation Hoerlin4 published results he obtained on the line Peru—Strait of Magellan—Hamburg. These results and those of the other authors as given by Clay are represented in Fig. 1 by continuous curves, my own results by open circles. Clearly the latter lie somewhat closer to Clay's curve than to Hoerlin's.
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References
J. Clay, Proc. Amsterdam, 30, 1115, 1927; 31, 1091, 1928.
A. H. Compton, Phys. Rev., 43, 387; 1933.
J. Clay and H. P. Berlage, Naturwiss., 20, 687; 1932. J. Clay, Naturwiss., 21, 43; 1933.
H. Hoerlin, NATURE, 132, 61, July 8, 1933.
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PRINS, J. Latitude Effect of Cosmic Radiation. Nature 132, 781 (1933). https://doi.org/10.1038/132781a0
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DOI: https://doi.org/10.1038/132781a0
