Agricola, Georgius - De re metallica

Agricola, Georgius, De re metallica, 1912/1950

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1

The space between two veins is called an interveníum; this interval
between the veins, if it is between venae dilatatae is entirely hidden under
ground. If, however, it lies between venae profundae then the top is plainly
in sight, and the remainder is hidden.

Venae profundae differ greatly one from another in width, for some of
them are one fathom wide, some are two cubits, others one cubit; others again
are a foot wide, and some only half a foot; all of which our miners call wide
veins. Others on the contrary, are only a palm wide, others three digits,

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