From Southern Cross to



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Diagram of elements of the Eschenhagen Magnetometer showing housing for the clockwork rotating drum for mounting the light sensitive paper, the variometers containing the suspended magnets and the light source lamp at the side of the clockwork drum mechanism. Note the almost complete reversal of magnetic and geographic meridians as the Hut Point observatory was located to the south-east of the magnetic dip pole. (Royal Society, 1909: 3)
The Southern Cross expedition did not establish a structure for magnetic observations at the base, Camp Ridley on Cape Adare. Instead Louis Bernacchi and Captain Lieutenant William Colbeck (who shared the observing) used a tent for shelter during observations. In contrast, Drygalski’s Gauss was icebound and made no continental landing in Antarctica, so the physicist on the expedition, Freidrich Bidlingmaier, constructed an observatory of ice blocks on the floe adjacent to the ship. This was well situated for the observations as there was no interference from metal in the ship or ferrous rocks, but as the floe sank gradually under the weight of snow, Bidlingmaier had to work in the unheated snow house while knee-deep in hypersaline sub zero slush. Physicists on Scott’s Discovery (Louis Bernacchi) and Mawson’s Aurora (Eric Webb) had the comparative comfort of custom-built huts which in Bernacchi’s case, was heated by an oil lamp at least some of the time.

Magnetograph House (the Variation hut) at Cape Denison (2010), a remnant from Mawson’s Australasian Antarctic Expedition, 1911-14.



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