Abstract
THE Meteorologische Zeitschrift for April contains an interesting article by Prof. G. Hellmann on the knowledge of the magnetic declination before the time of Christopher Columbus. Some years ago Prof. Hellmann pointed out that, independently of the discovery by Columbus, the variation must have been known on the Continent, from the construction of many pocket. sundials provided with magnetic needles for adjusting the instruments to the astronomical meridian, and showing the declination by a line on the floor of the compass-box.
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