lewis hole


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lewis hole

[′lü·əs ‚hōl]
(mining engineering)
A series of two or more holes drilled as closely together as possible, but then connected by knocking out the thin partition between them, thus forming one wide hole having its greatest diameter in a plane with the desired rift.

lewis hole

A dovetailed recess which is cut in a masonry unit for the reception of a lewis.
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