Every mechanic who has occasion to punch holes in iron with a hammer and hand-puncn, realizes how difficult a matter it is to place the punch in the exact position that it should be, over the hole in the die or punch-block. The piece to be perforated is necessarily between his eye and the hole in the die, and, of course, con ceals the exact spot where the point of the punch �;hou Id start. As usually done, a blow or two on the punch will f:how him about where the proper place is, but the iron

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... bruised and a clean punched hole not often secured.