, 1923-02-22
OFFERS OPEN
ING FOR GLASS PLANT
CITY Offers SILICA SAND, LIMESTONE AND ma
TURAL GAS TO MANUFACTURER. MAIN line
WOULD TAKE PRODUCTS TO MARKET

to undertake the manufacture Of
glass. This is not hard to under
stand when we recognize that the
cost of fuel is. exclusive of labor.
usually the largest single expense
involved in the production of this
commodity.
In the early days. wood n coal
were severally employed for direct
firing until Siemens, in Germany,
brought out his r%egenerative glass
furnace in 1861. He showed how it
was possible to generate gas from
he coal outside of the furnace and
then burn it, on the principle of the
Bunsen burner, in melting the glass
ingredients held in clay pots. The
gaseous fuel was more economical,
reduced the melting time, and made
1t practicable to improve the quality
OF the glass while augmenting the
output. AS might be expected, the
advent of natural gas and the use of
fuel oil have influenced the industry
and done much to stimulate the
shifting of the plants to those points
where these fuels could be had read
lily and at comparatively low prices.
The idea of the regenerative furn-
ace has been developed greatly since
Siemens called it into being. and
most of the furnaces installed today
are of the so-called tank type which
melt the glass in large quantities
without to pots: and they
are so constructed that the glass,
during its melting. undergoes auto-
matically a purifying process. These
furnaces run continuously for
months at a time; they furnish glass
of a superior quality, and they MAIN
tain a steady supply OF many tons
!, of tho f1ntI inRanlaCran vitraAng
matter.
; In the past, the glass blower was
| an Indispensable worker. and even
. today he continues to retain his
T place in the craft. but in diminishing
: numbers. The tendency now is to
5 By means of exquisitely synchro-
: nized equipment, gobs OF white-hot
V plastic glass are fed mechanically
! from the melting ank and sent
' scurrying down metal chutes into the
molds of one. two, three. or moro
! automatic machines. where the glass
, is successfully formed into bottle
! blanks. for instance. and then de-
Hvered. without human aid. into the
= blowing molds where the bottles are
/ finished. Thes apparatus are cap
, able OF turning out containers rang
, ing all the way from l-dram Walls
; to ~l2-gallon bottles. The Walls are
produced Mt the rate OF 165 a min
, ute. and the bulky siphons are mod
, eled at n speed varying from 10 to
IA n minute. The machines do this
/, right along twenty-four hours a day
!, for six days n week.
= oil them and to remove n defective
substitute machinery for manual la
Dor wherever conditions warrant. and
this movement is tn consequence
of the prime charge which wages
represent in the total cos. OF manu-
featuring glass. II would be quit,
out OF the question for us to have
nj of the boles. Jars. tumblers. etc,
that we can nowbuy at n moderate
price II inventive cunning had not
called to being apparatus that re-
ouire n minimum o Human super
vision. Some of these machines arc
semi-automatic and need the services
OF n or two men. while the most
recent are entirely automatic and a
single man can look after a group
OF them-his duty being merely to
mold and substitute a new one.
Instead OF the lungs OF the glass
blower. motive energy 81 furnished
In h @ form OF compressed air, which
IL peculiarly fitted. because OF its
"cushioninE effect" TO do the press
Ing and blowing. 10 regulate the
glass supply. and 10 cool the glass at
certain stages. Further. compressed
air tends TO moderate the atmosphere
where the men work. TO give tho
necessary impulse to tho gaseous
fuel At the tanks. and TO perform
various other essential services. In
the tumblcr machines. air actuates
tho formative plungors and seals IN.
mould 80 that the lump OF glass can
be confined and pressed into shape.
As the newly made tumbier issues
from the mold II passes across tho
path or n stream OF cooling air. and
this makes the glowing vessel firm
enough to hold its shape when lift
cd by ACKNOWLEDGEMENTS tongs
and onto n nearby rack or
n metallic %convcyor which Transports
II TO tho lchr or annacling oven.