El Paso herald. (El Paso, Tex.) 1901-1931, 1914-11-24

| - y LAIN GLASS was IlrSI known
in France, commercially, some
what over 200 years ago, al
though glass, in one form or another
mas been in use for many centuries
SAID ). E. Preston, of the E. Paso
Sash and Door company. Rotary club
~ ;uSII, Der. Apparently glass was known
IN Egypt 1000 years ago.
| PTlslum, France, Germany and Eng
tanu nave been the most prominent in
Siae extensive manufacture of glass for
uTeoI dlIVe purposes. Considerable plate
3 lass IS made in the Argentine repub-
nc belgium comes first, as her deposits
u raw material are unlimited. Ger
tnaiiy Is second and France, the United
oe&ISs' england and the Argentine re-
puDIic come in the order named.
The materials used in the manufac-
euIS OF plate glass are silica, a white
SaHu' carbonate of soda, commonly
hnoWH as soda ash, and lime, with
slnau proportions of arsenic and char
oOeL- Inc mining of silica, the quar-
ISIhg OF limestone and the chemical
manufacture of soda ash are all carried
on very extensively in this country and
facture
Worked With Bare Feet.
Fots Of fireclay are mixed and
Anedued IN mill and seasoned in bins,
sometimes Tor as long as a year, to be
aug out and put through a treading
process by men in bare feet This is
apparently the only successful method
discovered so far by which the right
kInd or Elasticity can be obtained. The
average pot holds a ton of molten
glass TO a furnace heat Of 5000 degrees.
Melting reduces the bulk so that the
pot Is filled three times before it con-
talhs a suIIlc1ent charge of metal A
crane lifts the pot from the furnace
and an electric tramwav carries it to
an IRON casting table on which there
is a heavy iron roller so arranged as to
roll the entire width Of the table The
haiL-LiuId metal is poured on the table
ana the rolIer passes over it. leaving
layer OF uniform thickness.
Speedy Operation.
rms operation IS a speedy one and
IS performed close to an annealing
oven and the red hot plate is showed
INTO II where 1t remains several days
until the temperature is reduced from
an intense heat to the temperature of
an ordinary room. From the oven the
cast glass is carried by as many as 20
men to revolving platform of about
20 feet IN diameter, where it is laid on a
surface of plaster Of paris flooded with
water. The men mount the plate and
tramp 1t into place and the revolving
table IS set in motion. Revolving run
ners fed by water and sharp sand COM
plete the grinding and blocks of felt
attached to reclprOcaing machinery
led with rouge and water. completes
the polishing, and so we have polished
plate glass.
Window Glass.
THE same pots of molten glass are
used in the manufacture of window
glass, save that a blowpipe attached to
compressed air machine blows
the metal in a cylinder IS feet
long and so inches in circumference.
HAND blown glass involves a much
smaller cylinder and is the more ex-
pensive, but much simpler in opera
ton, for as yet makers have not dis
covered continuous process Of ma
chine manufacture.
After the glass in the cylinder is
cooled off, the casting is opened by a
red hot iron which is run down the
cylinder cutting the glass as if bv a
knife. The cylinder is then placed in