Abstract
THE standard instrument for declination measurements at the Magnetic Observatory, Hermanus, is an Askania standard magnetometer-theodolite of the Schmidt type. The two declination magnets supplied with the instrument are in the form of solid steel cylinders of length 7 cm. and diameter 1.2 cm., fitted with plane mirrors at both ends. The telescope is of the usual ‘auto-collimating’ type. Provided the angle between the magnetic axis and the normal to a particular mirror surface remains constant, the difference between the ‘magnet erect’ and ‘magnet inverted’ readings (E–I) provides a ready control during observations.
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VAN WIJK, A. Observed Changes in the Angle between the Magnetic Axis and the Geometric Axis of a Bar Magnet. Nature 165, 726–727 (1950). https://doi.org/10.1038/165726b0
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DOI: https://doi.org/10.1038/165726b0
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