Evening times-Republican. [volume] (Marshalltown, Iowa) 1890-1923, 1903-04-29

outside OF the finished jar. Into the
mold, which is very much Ike a bucket
With a heavy rim, and inolds only that
portion of the jar up to where it tapers
.oward the neck. Is thrown Il "wad" of
LAY. All during this process the mold,
With the clay inside, is revolving rap
dly. Inside the mold and smaller by
lust the thickness of the walls OF the
lar to be made. is placed by the work
nan another mold, the outside of which
.epresents a cast of the inside OF the
Jar. The latter mold the "jollyman"
slowly presses down uoo the clay in
the bottom, holding the inner mold a
sufficient distance from the wall Of the
outside mold so that the pressure on the
clay causes 1t to rise all around be-
tween the two casts. The unused clay,
which runs over the side, is wiped off.
the inside mold lifted out, and the clay
vail of the jar still ciinging to the
plaster mold is also removed from the
machine. That portion of the top Of the
lar, from where it begins to taper to.
ward the opening, Is then nodded in
much the same manner excepting the
inside mold is done away with. The
clay is placed In a plaster mold repre-
senting the outside of the top, but in
stead of using another for the inside,
i metal arm, holding at the properly
adjusted distance a knife. the edge OF
which corresponds exactly with the
angles ard curves of the mold of the
top, is brought down and held by the
workmen while the revolving mold.
with it's clay, passes under it. In this
Dnat,nnr thu Hn1ou jc &c rco1 i Into oNyar,t
nook and corner of the cast, the arm
with its knife is uplif:ed, and the top
of the jar with its walls of proper
thickness, is removed with the mold.
The edges of the two parts in their
molds are moistened and the molds
turned together. These are carried
away to the first drying or "sager"
room.
The Drying and Burning Process.
The nodded jar in its two plaster
is allowed to remain in this first
Trying room over night. During that
time a large portion Of the moisture
IN the clay is absorbed by the. plaster
molds. The following morning the
nolds are loose, and Lifted off, the still
soft jar. The jar is then placed on a
REMOVING finishing Iuc.cIlIle, Oh winch
the wOrkmen loo fol- flaws in shape.
II any are found it is discarded, but
If not the seam caused by Joining the
molds is smootlied down, other
slight defects are remedied, and the
piece is ready to be dried. 1t is put in
A frame and taken beyond the first
dry roona into the second, where for
twelve hours 1T is fanried by a %continu-
oUs blast Of hot air ut a temperature
of about $50 degrees. At the end OF this
time it is dry as a zone and ready for
the glazing room. Each floor is
equipped with two OF these glazing
tanks, where ach piece is immersed
in a liquid solution of glazing fluid.
The Jars are then placed in perforated
holders and are ready for the kilns,
each of which has a capacity of about
three carloads. For thirty-si hours
they are roasted in these conical-
ovens, with the temperature
at from 2.100 to 2,40O degrees. Twenty
four hours longer is required after
burning before the ware can be handled.
Hot Air Is Utilized.
This cooling off process of the kilns
is what furnishes the heated air with