Abstract
1. Experience has shown that the Bidlingmaier “activity” measure for the magnetic characterization of days entails too much labor to be successfully put into general practice. Accordingly, Chree,1 Hazard,2 Adolf Schmidt,3 Bauer,4 and van Dijk,5 have been led to suggest other methods of procedure for obtaining measures of magnetic activity. It is also being recognized more and more that the so‐called international magnetic “character” numbers, issued for quarterly periods by the De Bilt Observatory in behalf of the Commission on Terrestrial Magnetism and Atmospheric Electricity of the International Meteorological Committee, do not serve all the purposes desired. The time therefore has come when it would seem advantageous to omit further discussion of past methods and give serious attention to finding some comparatively simple method for the magnetic characterization of days, the adoption of which will not greatly add to the work of the usual observatory personnel.
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