Abstract
A REMARKABLE series of observations have recently been taken in a boring at Sperenberg, near Berlin. The bore was carried to the depth of 4,052 Rhenish (or 4,172 English) feet, and was entirely in rock salt with the exception of the firs c 283 feet, which were in gypsum with some anhydrite. The observations were taken under the direction of Herr Eduard Dunker, of Halle-an-der-Saale, and are described by him in a paper occupying thirty-two closely printed quarto pages (206–238) of the Zeitschrift für Berg-Hütten-und-Salinen-Wesen (xx. Band, 2 und 3 Lielerung, Berlin, 1872).
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Underground Temperature 1 . Nature 15, 240–243 (1877). https://doi.org/10.1038/015240a0
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DOI: https://doi.org/10.1038/015240a0