Boring tool

Definition and stakes

George G. André,  Rock Blasting

“ This is sufficiently obvious, since it amounts to increasing the proportion of the whole time consumed that is occupied in actual boring; for [147] as it is in the rapidity of the operation of boring alone that the superiority of machine labour exists, it is plain that the longer the proportion of the time so occupied, the more marked that superiority will be. Thus, by increasing the depth of the holes to the farthest practicable limit, we approximate as much as possible to the condition most favourable to machine boring. ”
Source: Gutenberg

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