The Republican. [volume] (Oakland, Md.) 1877-current, 1908-03-19

and which the survey has pointed out
could be much more extensively exploit
ed than has ever yet been done.
The collection of clays and clay pre-
ducts is very exhaustive, a series of ex-
hibition jars containing leading types of
brick, terra Gotta. sewer pipe, pottery
and fire clays, on which are based some
of the most important industries of the
State.
Maryland fire brick and other refrac-
tory products are known throughout the
country and have been extensively ex-
ported. The pottery also is well known
and the.collection contains a splendid
display of all of the various kinds of
products manufactured in Maryland
from these different types of clays.
The most noticeable features are a
large brick booth covered with thing
made ins. Baltimore, and large case
contains beautiful examples OF pottery
made by the two leading pottery works
of Baltimore.
The one table shows the gold, copper,
chrome and iron ores of Maryland, from
none Of which today any large produc-
ton comes, although the chrome, copper
and iron deposits afforded at one time
tbp most i,,,,,o,.+or+ .-,,,,,..1 = NJ.
lands mineral products. The iron ores
We're known early in Colonial days, the
formation of the Principle Company in
l722.marking the beginning of an i'm
portant industrial epoch in eastern
North America.
This company and others formed in
Maryland not long thereafter furnished
gunssand projectiles to the Continental
Army.
Chrome-ore mining afforded an i'm
portant industry in Maryland from the
discovery of chrome ore in the serpen-
tine Of the Bare Hills in 1927 down to
1860, when the much larger deposits
found elsewhere in the world caused
the practical cessation of the enter
prise, although Baltimore retained
afterward. prominent position as a
center for the manufacture of chromium
salts.
Copper also was extensively mined at
one time, particularly in Baltimore and
Frederick counties, the copper used on
the roof of the original dome of the
Capitol in Washington coming from
Maryland deposits. Within the last few
years there has been some revival both
in the production of copper and iron,
and it is possible that in the near
future, with modern and economical
methods they may again become i'm
portant industries.
A special feature has been made Of
the lime and comet products, which
have for many years been the basis of
important industries and which will be
soon much more exploited since the
survey has pointed out the value of the
limestones for the manufacture of port
land cement, which is now brought in
large quantities to the Baltimore and
Southern markets from the Lehigh dis
trict Of Pennsylvania and New Jersey.
The Maryland limestones and shales
have been shown to be practical in char
acter and in every way well adapted
for the manufacture Of the highest
grades Of portland cement, the use for
which has been increasing with such
great rapidly within recent years.
The exhibit also contains displays of
many other products furnished by the
Maryland rocks which, combined, have
a considerable annual production. Large
blocks of feldspar and flint have been
secured from Baltimore, Hartford and
Cecil counties, which furnish some of
the best products of this kind found
anywhere in the United Strtes. There
are also collections of soapstone, tale,
barytes, asbestos and silica (diatoma-
ceous earth).
The highway exhibit is one of the
most striking in the collection. On the
wall to the right of the entrance are six
cases, each 20 feet long, with glass
fronts and tops. Five of these cases
contain full-sized cross-sections of DIFF
ferent kinds of roads as built according
to the best modern practice by the
Geological Survey. The sixth case
shows in a very realistic way cross
section of road as built under the old
fashioned method of simply spreading
roughly broken stone on an unprepared
roadbed with the unsatisfactory condi-
tons resulting.
The five sections also show the diff
ferent types Of materials used in road
construction in Maryland. one of them
at the same time indicating the most
approved methods of draining.