Agricola, Georgius - De re metallica

Agricola, Georgius, De re metallica, 1912/1950

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1

If a vein is soft and the rock of the hanging and footwalls is weak,
a closer structure is necessary; for this purpose timbers are joined together
in rectangular shapes and placed one after the other without a break. These

57[Figure 57]

A—WALL PLATES. B—DIVIDERS. C—LONG END POSTS. D—END PLATES.

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