.................. 84.9
Oxide of manganese........................... 9.2
Water........................................ 1.9
Quartz....................................... 4.1
----
100.1
_Compact Ore_.
Fe_{2}O_{3} and traces of manganese.......... 99.6
Quartz....................................... 1.1
----
100.7
_Situation of the Forges_.--A forge is usually placed on the bank of
a brook, or rather of a torrent, which supplies the fall of water
necessary for the motive power by means of a flume about a hundred
meters in length. In most cases the forge is surrounded on all sides
with a forest which yields the wood necessary for the manufacture of the
charcoal, and is in the vicinity of the iron quarry, so as to reduce the
expense of hauling the ore as much as possible.
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