The Barre daily times. (Barre, Vt.) 1897-1959, 1911-10-13
MANUFACTURED GRINDSToNES.
Official Figures Show Increased Products
Of Abrasive Materials.

Va NASANSAFN AAHhNAASAos
Over 100000 worth of abrasive ma.
terials were produced in the United
States last year. All branches Of the
abrasive industry showed ,notable growth
except the milestone and the grandstone
industries, according to w. C. Phalen,
of the United States geological survey,
IN an advance chapter from mineral re-
sources OF the United States, 1910.
The total estimated value of all the
abrasive materials consumed in this
country last year was S4,234, G62, of
which S3,0l0,S35 worth were of domes-
tic production. Although there was a
decrease in the production Of millstones
and grindstones, the grindstone industry
is stated to be in healthy condition.
The falling off in the production of
millstones is due TO the introduction
of superior forms of grinding machinery,
such as rolls and ball mills In grind
ing wheat the rolling mill process is
now used almost exclusively.
Increase in Artificial Abrasives
Abrasive materials may be divided
into two classes natural and artificial.
The production of artificial abrasiyes has
shown great increase since they were
first made, less than IS years ago, and
at the present time it exceeds that of
the natural abrasives. During 1910
natural abrasives valued Mt $l,406 sos
were produced in p states. OF these
materials, grindstones and pulp stones
led with production valued at $780,
2a4. The states which produced grind
stones are Ohio, Michigan, West Vir.
ginia, and Colorado Ohio producing
more than seven times as much as all
the other states combined. The inn
ports Of grindstones and pulp stones in
creased in 1910, amounting to $780,
500 compared with S99,l5S in 1909.
The production of burrstones and
millstones in the United States in 1910
was valued at S2s,2l7 The stones came
from New York. Virginia, North Car.
DINA, Pennsylvania, and Alabama. The
value of the production of New York
alone in 1910 was sl3,753, nearly half
that of the output of the entire country
As indicative of the steady decline in
the milestone industry, it may be stat
ed that in 1880 the value of the pro-
duction was 100000 BY 1887 the fig
ures fell to 100000; in 1900 to S32,-
S5S.
The production Of oilstones and
seythe stones in 1910 amounted to $228.-
694, compared with s2l4,0l9 in 1909
Oilstones were produced in Arkansas,
Indiana, and Ohio, the production OF
Arkansas amounting TO nearly IS per
cent of the whole. Scythe stones were
produced in New Hampshire, Vermont,
Michigan, and Ohio, New Hampshire
furnishing nearly Go per cent. of the
whole
Garnet An Important Abrasive.
Garnet Is one Of the very hard min
erals, and is extensively used as an
abrasive. The production of abrasive
garnet in 1910 amounted to 1914 short
tons, valued at $ll3,574. This was
an increase of $40 tons, OF rs
per cent. in quantity. and of Sll,250. or
II per cent, in value. The industry is
confined to New York, but Il
small production was noted in North
Carolina and New Hampshire.
In the class of artificial abrasives are
carborundum, alundum, and
crushed steel The production Of arti-
fetal abrasives in 1910 showed an in
crease Of 2,559,00o pounds in quantity
and Of S23S,2l0 in value as compared
with 1909.
Aluminium Furnishes New Abrasive.
Mention is made in the report of a
new artificial abrasive, "corubin,' man
ufaetured abroad, which has recently
been put on the market. The material
is produced from the slag resulting from
the reaction between aluminium aud
chromium oxides. It is practically pur,
alumina containing trace of chromium
oxide, which gives it a red color. On
account Of the high temperature at which
it IS manufactured, it is free from com
bined moisture 1t is produced in three
grades, coarse, medium and fine and is
sold only in the proportion of two parts
coarse to one each of medium and fine.
A copy of Mr.. Phalen's report may be
obtained without cost on application to
the Director of the Geological Survey
Washington, d. c.