Abstract
I am glad to be able to submit herewith the results of magnetic observations made in de Bilt Observatory during the total solar eclipse of May 17, 1901. I have but to add the following remarks :A. EYE‐OBSERVATIONS.Declination. A variometer was made use of, consisting of a telescope with scale and a freely movable magnetic needle, one side of which was polished as a mirror. The distance from mirror to scale was such that one division represented 0.502 of a minute.
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