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SUBTERRANEAN HEAT
Future Possibilities
{SPECIAL TO 'THE MAIL')
LONDON, September 2.
The possibility of boring holes four or
fisse miles apart, in most land 'areas of the
globe for the purpose of utilising the
earth's internal heat was discussed at the
?science Congress. -..*..
?;' Mr. J.-L. 'Hogson, a civil**'engtneer, 'ieni-
puasLsed that the hot rocks of the earth's
interior stored heat thirty million -times
more than' the amount stoned' in the
earth's coal reserves. If they went down
30 miles they, would tap ten times the heat
Which tbe coal deposits would give, and
providing heat whicli would last mankind
many thousands Myeafs. ? Such exploita
tion was on tte borderline of practica
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