Show down where its hot the deepest hole bole in the world up to date Is the boring begun ten years ago at Cz silesia with tho the object of attaining a depth of 2500 meters and which has now reached a depth of 2240 meters feet the bore Is 44 centimeters in diameter at the top and diminishes progressively gres to alve centimeters measurements ure ments of temperature have been made regularly at 2220 meters the temperature Is degrees C degrees F this gives a geothermic degree amount of descent corresponding to a rise of temperature of I 1 degree C of meters the change of temperature does not proceed uniformly in fact an interest ing temperature inversion occurs be tween the depths of and meters where the temperature actually falls with descent about two degrees eesi scientific american |