Patrick Reimann, patented federally engineer-geometer, investigates the influence of the earth’s curvature and terrestrial refraction in trigonometric altitude determination from mountain summits and triangulation points a few to 150 kilometers away. Interest is also directed towards how Sir George Everest succeeded around 1850 in determining the trigonometric altitude of Mount Everest, later named after him, to an accuracy of 8 metres. The distance between the visures was about 200 kilometres, which, in theory, did not and still does not lead to the conclusion that such a high degree of accuracy was possible. For this reason, the trigonometric measurements on the Jungfraujoch are now also carried out with ‘historical’ instruments, in this case the repetition theodolite of the Kern company from 1909. For more details see the annual report 2019. Photo by Julia Wunsch.
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