Agricola, Georgius
,
De re metallica
,
1912/1950
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pagenum
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151
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<
s
>The iron block is six digits in length and width; at the upper end it is
<
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two digits thick, and at the bottom a digit and a half. </
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<
s
>The iron plate is
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the same length and width as the iron block, but it is very thin. </
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<
s
>All of these,
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as I explained in the last book, are used when the hardest kind of veins are
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hewn out. </
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<
s
>Wedges, locks, and plates, are likewise made larger or smaller.</
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<
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number
="
77
"/>
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<
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>A—SMALLEST OF THE SMALLER HAMMERS. B—INTERMEDIATE. C—LARGEST. D—SMALL
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lb
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KIND OF THE LARGER HAMMER. E—LARGE KIND. F—WOODEN HANDLE. G—HANDLE
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FIXED IN THE SMALLEST HAMMER.</
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</
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<
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>Hammers are of two kinds, the smaller ones the miners hold in
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lb
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one hand, and the larger ones they hold with both hands. </
s
>
<
s
>The former,
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lb
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because of their size and use, are of three sorts. </
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>
<
s
>With the smallest,
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that is to say, the lightest, they strike the second “iron tool;” with the
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intermediate one the first “iron tool;” and with the largest the third “iron
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tool”; this one is two digits wide and thick. </
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>
<
s
>Of the larger sort of hammers
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lb
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there are two kinds; with the smaller they strike the fourth “iron tool;”
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lb
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with the larger they drive the wedges into the cracks; the former are three,
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lb
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and the latter five digits wide and thick, and a foot long. </
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>
<
s
>All swell out in
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their middle, in which there is an eye for a handle, but in most cases the
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handles are somewhat light, in order that the workmen may be able to strike
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more powerful blows by the hammer's full weight being thus concentrated.</
s
>
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</
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</
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