THE EARTH'S DEEPEST HOLE.
The deepest hole in the world, up to date, is the boring begun ten years ago at Czuchow, Silesia, with the object of attaining a depth of 2,500 metres, and which has, nowreached a depth of 2,240 metres (7,349 feet). The bore is 44 centimetres (17 inches) in diameter at the top, and diminishes progressively to 9 centimetres. Measurements .of temperature have been made regularly. At 2,220 metres the temperature is 83.4 degrees C. (182 degrees F.). This gives a "geogthermic degree" amount of descent corresponding to a rise of temperature of 1 degree C.) of 21.8 metres. The change of temperature does not proceed uniformly. In fact, an interesting "temperature inversion" occurs between the depths of 640 and 730 metres, where the temperature actually falls, with descent, about 2 degrees.
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King Country Chronicle, Volume VII, Issue 526, 14 December 1912, Page 2
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135THE EARTH'S DEEPEST HOLE. King Country Chronicle, Volume VII, Issue 526, 14 December 1912, Page 2
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