Geology Hansteen, Christopher Studies on the magnetism of the earth translated by P(eter). Treschow Hanson. 2 vols, atlas and text volume. Christiana (Oslo) and Copenhagen, Lehmann & Gröndahl (for the author), 1819. XXX, 502 p., (2), 148 p. With 5 folded plates (text volume) and copper title and 7 engraved plates. HLdr. with coloured paper cover and leather corners. BEA I, 468/69 - DSB VI, 106-07 - Poggendorff I, 1015 - Wheeler Gift I, 756 - The rare and only publication of the important work of the Norwegian astronomer Christopher Hansteen (1784-1873), in which he developed the standard method for magnetic observations, which was valid for many decades and was used by many explorers during their expeditions. The Earth's magnetic field serves to deflect most of the solar wind, whose charged particles would otherwise erode the ozone layer that protects the Earth from harmful ultraviolet radiation. The corresponding atlas volume was published separately. - Text pages somewhat brownstained in places, the atlas only minimally browned, mostly very clean. Complete, very rare. Geology. - 2 volumes, text and atlas. - The rare and only publication of the important work of the Norwegian astronomer Christopher Hansteen (1784-1873), in which he developed the standard method for magnetic observations, which was valid for many decades and was used by many explorers during their expeditions. The Earth's magnetic field serves to deflect most of the solar wind, whose charged particles would otherwise erode the ozone layer that protects the Earth from harmful ultraviolet radiation. The corresponding atlas volume was published separately. - Text pages partly somewhat brownstained, the atlas only minimally browned, mostly very clean. Complete very rare.