1division of the compass—that is at a
right angle.
Then that part
of the lowest cord which lies beyond the part to which the cross-cord
runs being removed, it shows at what point the boundary mark should
be cut into the rock of the tunnel or drift. The cutting is made in the
presence of the two Jurors and the manager and the foreman of each
mine. For as the Bergmeíster in the presence of these same persons sets
the boundary stones on the surface, so the surveyor cuts in the rock a sign
which for this reason is called the boundary rock. If he fixes the boundary
mark of a meer in which a shaft has recently begun to be sunk on a vein,
first of all he measures and notes the incline of that shaft by the com
pass or by another way with the applied cords; then he measures all
the drifts up to that one in whose rock the boundary mark has to
be cut. Of these drifts he measures each angle; then the cords, being
laid out on the surveyor's field, in a similar way he stretches a cross
cord, as I said, and cuts the sign on the rock. But if the underground
boundary rock has to be cut in a drift which lies beneath the first drift, the
surveyor starts from the mark in the first drift, notes the different angles,
one by one, takes his measurements, and in the lower drift stretches a cord
beyond that place where he judges the mark ought to be cut; and then,
as I said before, lays out the cords on the surveyor's field. Even if a vein
runs differently in the lower drift from the upper one, in which the first
boundary mark has been cut in the rock, still, in the lower drift the mark
must be cut in the rock vertically beneath. For if he cuts the lower mark
obliquely from the upper one some part of the possession of one mine is
taken away to its detriment, and given to the other. Moreover, if it
happens that the underground boundary mark requires to be cut in an
angle, the surveyor, starting from that angle, measures one fathom toward
the front of the mine and another fathom toward the back, and from these
measurements forms a triangle, and dividing its middle by a cross-cord,
makes his cutting for the boundary mark.
of the lowest cord which lies beyond the part to which the cross-cord
runs being removed, it shows at what point the boundary mark should
be cut into the rock of the tunnel or drift. The cutting is made in the
presence of the two Jurors and the manager and the foreman of each
mine. For as the Bergmeíster in the presence of these same persons sets
the boundary stones on the surface, so the surveyor cuts in the rock a sign
which for this reason is called the boundary rock. If he fixes the boundary
mark of a meer in which a shaft has recently begun to be sunk on a vein,
first of all he measures and notes the incline of that shaft by the com
pass or by another way with the applied cords; then he measures all
the drifts up to that one in whose rock the boundary mark has to
be cut. Of these drifts he measures each angle; then the cords, being
laid out on the surveyor's field, in a similar way he stretches a cross
cord, as I said, and cuts the sign on the rock. But if the underground
boundary rock has to be cut in a drift which lies beneath the first drift, the
surveyor starts from the mark in the first drift, notes the different angles,
one by one, takes his measurements, and in the lower drift stretches a cord
beyond that place where he judges the mark ought to be cut; and then,
as I said before, lays out the cords on the surveyor's field. Even if a vein
runs differently in the lower drift from the upper one, in which the first
boundary mark has been cut in the rock, still, in the lower drift the mark
must be cut in the rock vertically beneath. For if he cuts the lower mark
obliquely from the upper one some part of the possession of one mine is
taken away to its detriment, and given to the other. Moreover, if it
happens that the underground boundary mark requires to be cut in an
angle, the surveyor, starting from that angle, measures one fathom toward
the front of the mine and another fathom toward the back, and from these
measurements forms a triangle, and dividing its middle by a cross-cord,
makes his cutting for the boundary mark.
Lastly, the surveyor sometimes, in order to make more certain, finds the
boundary of the meers in those places where many old boundary marks
are cut in the rock. Then, starting from a stake fixed on the surface,
he first of all measures to the nearest mine; then he measures one shaft
after another; then he fixes a stake on the surveyors' field, and making
a beginning from it stretches the same cords in the same way and measures
them, and again fixes in the ground a stake which for him will signify the end
of his measuring. Afterward he again measures underground from that
spot at which he left off, as many shafts and drifts as he can remember. Then
he returns to the surveyor's field, and starting again from the second stake,
makes his measurements; and he does this as far as the drift in which the
boundary mark must be cut in the rock. Finally, commencing from the
stake first fixed in the ground, he stretches a cross-cord in a straight line to
the last stake, and this shows the length of the lowest drift. The point
where they touch, he judges to be the place where the underground boundary
mark should be cut.
boundary of the meers in those places where many old boundary marks
are cut in the rock. Then, starting from a stake fixed on the surface,
he first of all measures to the nearest mine; then he measures one shaft
after another; then he fixes a stake on the surveyors' field, and making
a beginning from it stretches the same cords in the same way and measures
them, and again fixes in the ground a stake which for him will signify the end
of his measuring. Afterward he again measures underground from that
spot at which he left off, as many shafts and drifts as he can remember. Then
he returns to the surveyor's field, and starting again from the second stake,
makes his measurements; and he does this as far as the drift in which the
boundary mark must be cut in the rock. Finally, commencing from the
stake first fixed in the ground, he stretches a cross-cord in a straight line to
the last stake, and this shows the length of the lowest drift. The point
where they touch, he judges to be the place where the underground boundary
mark should be cut.