What is meant by boring for coal ?

Boring for coal is a method of finding whether coal seams exist in a locality. A long sharp steel chisel,
worked by machinery, cuts through the layers of mate­rial. From time to time it is pulled up and another tool
called a u wimble ” is pushed down the bore or hole.

When this is brought up it brings with it some of the materials through which the chisel has cut its way,
and thus the men are able to find out whether coal exists there or not.

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