1the outer end, which alternately raise the stamp, in
order that, by its dropping
into the mortar, it may with its iron head pound and crush the rock which
has been thrown under it. To the cam-shaft is fixed a water-wheel whose
buckets are turned by water-power. Instead of doors, the mouth of the
mortar has a board, which is fitted into notches cut out of the front of the block.
This board can be raised, in order that when the mouth is open, the workmen
into the mortar, it may with its iron head pound and crush the rock which
has been thrown under it. To the cam-shaft is fixed a water-wheel whose
buckets are turned by water-power. Instead of doors, the mouth of the
mortar has a board, which is fitted into notches cut out of the front of the block.
This board can be raised, in order that when the mouth is open, the workmen
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