Abstract
SOME interesting observations on underground temperature have recently been made at Cremorne, near Port Jackson, in New South Wales.1 The bore is 2939 feet deep, the mean temperature at the surface is 63° F., and the temperature at the depth of 2733 feet was found to be 97° F. The observations having been made with great care, the resulting gradient of 1° F. per 80 feet would appear to be “a good approximation to the truth.” The rocks of the district down to a depth of about 3000 feet consist of sandstones, shales and conglomerates, and therefore, so far as conductivity is concerned, seem to be not unlike the rocks penetrated by the shafts of coal-mines in the north of England, or those in which Forbes' rock-thermometers were sunk in the neighbourhood of Edinburgh.
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DAVISON, C. The Relative Lengths of Post-Glacial time in the Two Hemispheres. Nature 54, 137–138 (1896). https://doi.org/10.1038/054137b0
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DOI: https://doi.org/10.1038/054137b0