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