Albuquerque morning journal. [volume] (Albuquerque, N.M.) 1903-1926, 1918-12-13
WIRE CAP PAC|TY
IS INCREASED BY
NEW INVENTION
Five Messages May Now Be
Transmitted at Same Time
Over Same Pair Of TeIe-
graph Wires,


Washington, D. c., Dec 12.--Post-
master General Burleson today made
public letter from Theodore N. Vail,
president or the American Telephone
and Telegraph company announcing
the invention and development by the
technical staff of the Bell system Of
"a practical system of multiplex tele-
/ phony and telegraphy by the use of
which 1t Is now possible to increase
| many fold the message carrying ca
| pacity of long telephone and telegraph
wires"
with this new system said Mr..
| Wallis letter, -four telephone conver-
sations over one pair OF wires are sim
| ultaneously carried on. in addition to
the telephone conservation provided
by the ordinary methods Thus, over
single pair of wires total of five
telephone conversations are simultan-
| eonsly operated, each giving service
as good as that provided by the cir
cult working in the ordinary way.
Five Circuits on Two Wires.
"a number of years ago we develop
ed the phantom circuit arrangement
by which three telephone circuits are
obtained from two pairs Of wires. Now
by our multipleX method, we are en-
abled to obtain five telephone cir
cults over one pair of wires, that is
ten simultaneous telephone conserya-
tions from the two pairs of wires
which formerly could be used for only
three simultaneous telephone conser-
yations.
In telegraphy, as we'll as in tele-
phony, sensational results have been
attaind by the new system. BY com
bining two telegraph wires into me-
tallic circuit of the type used for reie-
phone working and by applying our
new apparatus and methods to this
metallic circuit, we have enormously
Increased the capacity Of the wires for
telegraph messages without In any
way impairing the quality of tele-
graph working.
The nature of these developments
is such that il desired wires may be
used partly for telephone and partly
for telegraph A pair Of wires is avail
able either for five simultaneous telse
phone conservations or for forty sim
ultaneous telegraph messages. or part
| ly for one and partly for the other
is Long line Feature.
From the nature of the apparatus
and the methods employed the system
is not practically advantageous on
short lines, either telephone or tele-
graph. On long lines its application
will be extended Immediately, but its
introduction must necessarily be grad
ual on account of the nature of the
apparatus required and the rear
rangement and adoption of the lines
themselves and their associated ap-
paratus to the new methods of work.
| ing. 1t is not too much to character
| ize this new system as marking an
epoch in the development of long dis
tance telephony and telegraphy."
Mr.. Vail said that an installation OF
the multlplex telephone system be-
between Baltimore and Pittsburg had
been in service for more than a
month
"On Monday of this week.. he said
accompanied by a party of distin-
guisbed government and telephone
and telegraph officials, / made an in
spection of the system of Baltimore
and test of the service provided be-
tween Baltimore and Pittsburgh All
of the party were delighted with the
successful working OF the new system
and the evident skill which had been
shown in developing IT,"