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HANSTEEN. A somewhat larger ring-plain, with a lower and more irregular rampart, rising on the W. to nearly 3000 feet above the floor, which is depressed to about the same extent as that of Billy. Both the inner and outer slopes are terraced on the E., where the glacis is traversed by a short, delicate, rill-like valley. There are some bright curved ridges on the floor.
Olmsted, following Hansteen, had already, in 1856, sought to establish an auroral period of sixty-five years. Roy. Bur. By observations made during a series of five remarkable eclipses, comprised within a period of eleven years, knowledge of the solar surroundings was advanced nearly to its present stage.
While Hansteen and Erman were still prosecuting their labours in every branch of natural science, Alexander von Humboldt, Ehrenberg, and Gustav Rose made a short visit to Siberia, which, however, remained one of the most important in the history of science.
On the W. of Billy and Hansteen is a wide inlet of the Oceanus Procellarum, bounded by the Letronne region on the W., and on the S. by lofty highlands. On the surface, not far from the S.W. border of Hansteen, is a curious triangular-shaped mountain mass, with a digitated outline on the S., and including a small bright crater on its area.
In fact, according to the astronomer Hansteen, this magnetic pole is located fairly close to latitude 70 degrees and longitude 130 degrees, or abiding by the observations of Louis-Isidore Duperrey, in longitude 135 degrees and latitude 70 degrees 30'. Hence we had to transport compasses to different parts of the ship, take many readings, and strike an average.
The expeditions, interrupted by the great wars following on the French Revolution, were resumed in 1828 by the Norwegian Hansteen, whose memorable expedition in company with Erman had such important results for the study of terrestrial magnetism.
His passion for the sea had never betrayed him, and at Rome, where he had long given up going to any galleries or studios, he still haunted the house of a Norwegian marine painter, Nils Hansteen, whose sketches reminded him of old days and recollected waters.
Between this and the ring- plain is a large but somewhat obscure depression, N. of which lies a rill-like object extending from the N. point of the triangular mountain to the W. wall. At the bottom of a gently sloping valley between Billy and Hansteen is a delicate marking, which seems to represent a cleft connecting the two formations.
M. Ramm, Inspector of Forests in Norway, wrote to M. Hansteen, in 1825, that he had heard the noise, which always coincided with the appearance of the luminous jets, when, being only ten years old, he was crossing a meadow covered with snow and hoar-frost, near which no forests were in existence. Dr.
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