Abstract
THE paper referred to below1 is an important contribution to our knowledge of oscillations in the magnetic elements, especially those of shorter period termed “pulsations” by Van Bemmelen. The records were obtained in an underground chamber near the Marine Biological Laboratory at Misaki, between 1910 and April, 1914, with a special set of very sensitive magnetographs, designed by Prof. Tanakadate. The magnetographs, which recorded the north (N), west (W), and vertical (V) components, show several original features. The V instrument, which worked very satisfactorily, had the magnet carried by horizontal quartz fibres. The sensitiveness of the instruments was about 0.15 γ per 1 mm., and the time-scale about 3J mm. to the minute.
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