Abstract

The late Dr. Eschenhagen was the first to show that when the moment of inertia of the suspended system in a horizontal force magnetograph is made very much smaller than that employed in the ordinary form, it is possible to detect variations in the Earth's field of quick period. Since the study of these short‐period variations promises to be of considerable interest, the design of self‐recording instruments capable of giving satisfactory records becomes of importance. Both Dr. Eschenhagen2 and the author3 have described forms of apparatus suitable for recording the variations of the declination and horizontal component. The design of a satisfactory form of instrument to record the rapid variations of the vertical component presents, however, some very considerable difficulties.

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