Home » categories » rare book library » Agricola. De Re Metallica.
This chapter is tagged (labeled) with: 

Book VIII: Extracting Metals | Earth

Book VIII: Extracting Metals | Earth Page of 673 Book VIII: Extracting Metals | Earth Text size:minus plus Restore normal size   Mail page  Print this page
294
BOOK VIII.
is turned by water-power, is made in the following way. An axle is rounded
to compass measure, or is made angular, and its iron pinions turn in iron
sockets which are held in beams. The axle is turned by a water-wheel, the
buckets of which are fixed to the rim and are struck by the force of a stream.
Into the axle is mortised a toothed drum, whose teeth are fixed in the side
of the rim. These teeth turn a second drum of rundles, which are made of
very hard material. This drum surrounds an iron axle which has a pinion
at the bottom and revolves in an iron cup in a timber. At the top of the
iron axle is an iron tongue, dove-tailed into the millstone, and so when the
teeth of the one drum turn the rundles of the other, the millstone is made to
turn round. An overhanging machine supplies it with ore through a hopper,
and the ore, being ground to powder, is discharged from a round wooden plate
into a trough and flowing away through it accumulates on the floor ;
from there the ore is carried away and reserved for washing. Since this
Book VIII: Extracting Metals | Earth Page of 673 Book VIII: Extracting Metals | Earth
Suggested Illustrations
Other Chapters you may find useful
Other Books on this topic
bullet Tag
This Page