Using Machinery in the Forests. [Volume: 8, Issue: 3, 1889, pp. 143-146]

No. 3.1 CHARCOAL IRON WORKERS. 143
ferent ores and fluxes are opposed in the proportions by weight
in which their stolchiometrical equivalents stand to each other.
19.59 parts lias ore are for a singulo silicate, as column 19 of the
above given table shows at a glance, equal to 23.92 parts of bog
ore; if a mixture containing 25 parts ]ias ore is to be replaced
by bog ore then 2- s.s 2 5=30.5 parts of the latter ore will be required. The oxygen ratio of the slag will in this case remain
unaltered; the amount of A120O in the mixture, however, as is
easily seen, will be reduced by the substitution of bog ore for
lias ore. If it is desired to increase this, then the addition of
some aluminous material, such as clay slate, is necessary, and as
soon as its composition and equivalent are ascertained, the table
shows at a glance how to make the change.
[This paper is more technical than those which generally appear
in the JOURNAL, but we think it is sufficiently explicit to be appreciated by most of those interested in the practical management
of blast furnaces for whose information its translation and publication were made. The importance of proper fluxing, and the relation!
which it bears to satisfactory blast furnace operations, is now generally appreciated, and we believe that the above contribution to
metallurgical literature will be welcomed by those who have the
practical direction of the blast furnace industry. Mr. Landis
made no attempt in his translation to introduce other ores than
those given by Ledebur, or to employ other units or values than
given in the original, the purpose being to present the method
rather than a local application.-The EDITOR.]
Using Machinery in the Forests.
The ingenuity displayed by inventors and the experimental
work which has been devoted to improvements in tree felling, log
transportation, etc., is beyond what is generally appreciated, and
an examination of the model room of the United States patent
office will show how thoroughly the ground has been covered.
The majority of these inventions, like patents of other specialties,.
of course, have never been practically applied, and others have.
had only an empirical existence. Whether the arrangements
described below will belong to one or the other of these. classes we