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The influence of the Sun‐spot frequency on the magnetic elements has been discussed by many investigators during recent years. The observations upon which the present investigation is based are those taken by the royal artillery during the years 1842–46 and published by Sabine in “Magnetical and Meteorological Observations”, Vol. 1. Cape of Good Hope. The period over which the observations extend is unavoidably limited so that it is impossible to say whether the results obtained are truly representative of a whole eleven‐year period.

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