In driving levels it is necessary to cut grooves vertically parallel to the walls, a process known as shearing; but the most important operation is that known as holing or kirving, which consists in cutting a notch or groove in the floor of the seam to a depth of about 3 ft., measured back from the face, so as to leave the overhanging part unsupported, which then either falls of its own accord within a few hours, or is brought down either by driving wedges along the top, or by blasting. [Please select]
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DESCRIBES "HOLING TO A HOUSE OF WATER" AND ITS TERRIBLE CONSEQUENCES. [Please select]
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The danger of "holing to a house of water," is so great and so well known that the operation is usually conducted with great care, and accident is well guarded against. [Please select]
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Here he makes his nest and passes the winter, holing up in October or November and coming out again in April. [Please select]
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