Abstract
The “annual review” of the “Caractère magnétique de chaque jour” for 1926 has been drawn up in the same manner as for the preceding year. Forty‐three observatories contributed to the quarterly reviews; all of them sent complete data. In the introduction of the “review” a note has been inserted concerning disturbed days. In the meeting of the Commission for Terrestrial Magnetism and Atmospheric Electricity of the International Meteorological Committee at Zürich, September 17, 1926, it was agreed that certain days included amongst the five most disturbed days of the month, should be included amongst the days selected for the calculation of the diurnal irregularities. Days of character 2.0 should be excluded and other highly disturbed days, on which loss of trace had occurred.
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