Juniata sentinel and Republican. [volume] (Mifflintown, Juniata County, Pa.) 1873-1955, 1895-12-04
THE CAST OF A BELL.

Interesting Process Which Few Foun'
ders Have Been Able to Master.
The operation Of casting bell is
most interesting one. The flask where
IN and wherein the mold is made con-
lists Of two parts. constructed of boiler
rom Of Q general bell form, and pienti-
.uly perforated With holes for escap-
ng gas while casting, one being SO
much less In size than its fellow as to
rive space for the loan forming the
mold between the two. No pattern"
Is the term Is generally used. Is pro-
rided. The two parts Of the mold are
swept" by formers" accurately fin
shed from thin iron to the form intend
ID for the inner and outer surfaces OF
he bell. These formers" are mount
ID and rotated over the applied loan.
Five courses of loan and clay are sue
.essively applied. swept" and baked,
% complete each mold. Before this
work Is done. however, the inner flask
Is wound near the top with rope made
If hay. AS the shrinkage is very great
as the castings cool, difficulty would
be met with in getting the flask and
Oam out of the nearly parallel inside
sop; this "pinch" is Obviated by using
This destructible base, which permits
the collapse Of the loan after the heat
IF the metal has consumed the hay.
The five courses laid on the TASKS
are: Loan, a mixture of loam, fire clay
md manure; two successive coatings
If powdered fire clay. and. lastly. thin
coating of brick and fire clay combined
with foundry facing. Each If these
,oatings Is baked in an oven before
the succeeding one is applied. The
.oatings are swept" by the formers.
IS applied, both in the inner and outer
tasks. by careful adjustments as to
thickness of materials, SO that when
the exterior mold Is placed over the in
terror, a space corresponding to the
Intended thickness and shape Of the
bell shall exist Inscriptions of en-
bellishments to be made upon the bell
are provided for with the last coating
by means of a "knurl" or wheel, having
the desired motto raised upon Its perl.
phery, the wheel being carefully rolled
around the soft surface and leaving Its
imprint in the clay. Other designs are
Impressed from dies Of the required Or
nament, and the usual beading" Is ac-
complished by notches in the edge OF
the sweep.
The two parts Of the flask being plac-
ed together are firmly help In position
by many clamps, the tendency OF hot
bell metal to squeeze through and force
Z separation Of TASKS being very great.
As the mold nears completion fire Is
started in a nearby reverberatory fur
mace, In which Is placed the desired
charge of copper. and when the copper
Ia melted the tin is added In its proper
ton. The melted metal being ready,
the furnace is tapped, the bright stream
caught in huge ladle swung over the
mold by q crane and poured into the
open mouth Of the mold until 1t 10 filed.
After cooling and removal from the
mold the bell Is usually polished with
sand and water in special revolving
grinding machines. The tongue and
clapper, the yoke and wheel are now
attached and the whole suspended In
it's frame. In making a chime the bells
are, after completion, temporarily sci
up and regularly tested by skilled bell
| ringers, from the permanent Ginning
stand of the foundry.
| A bell Of such proportions as the large
| one proposed for Milwaukee's city hall
has to be nodded and cast In q pit
| Milwaukee Wisconsin.