Every evening, Wilmington daily commercial., 1918-12-13
INVENTOR MULT LT|PL|ES
TELEPHONE FIVE FOLD
New Multiplex Method Enormously
Increases Telegraph Facilities;
Also Bell, President Says.

Washington. Dec i3.-it is now posi-
bic for five groups of people to carry on
telephone conversations simultaneously
over the identical wires without inter-
ference with one anothers words.
A development of the multipicx method
of using wires, making possible the trans
mission of five simultaneous telephone
conversations over one circuit OF TWO
wires, was announced today Ivy Post
master General Burleson IN tho form oi n
letter received by him from Theodore \
Vail, president of the American lelc-
phone and Telegraph Company.
Over n single pair of wires total
of tive telephone conversations are simlil-
taneously operated, each giving service
as good rs that provided by the circuit
working in the ordinary way, Mr Nai
said at is not saying too much tn
characterize this new system as marking an
epoch in the development of long-distance
telephony and telegraphy
USE PHANTOM CIRCUIT.
'Hcrctoforc the best telephone methods
known to the art provided only one tele-
phonc conversation NJ time over i
single pair Of wires \ number oi Years
ago VIC developed the 'pantom-clrcuIt
arrangement hv which three telephone
GtFftlltS arc NlnllIttl HUH tNp ifHhE -
wires. an important Improvement oi
which we have made extensive use. Now
bv our multiplcx method we are enabled
20 obtain five telephone circuits over ono
pair of wires: that is ten simultaneous
telephone conversations from the two
pairs of wires which formerly could be
used for only three simultaneous telephone
conversations This represents an IN
crease of more than threc-told IN the
telephone capacity Of the wires, as COM
pared with the best previous state OF the
art and n fivefold increase under CON
ditions where tho phantom circuit Is not
employed
sensational results have been attained
by the new system. BY combining two
telegraph wires into q metallic circuit oi
the type used for telephone working and
bv applying our new apparatus and
methods 10 this metallic circuit, we have
enormously increased the capacity OF the
wires for telegraph messages. As applied
to high-specd printer systems. we can
do eight times rs much as IS now done,
and as compared with the ordinary duplex
telegraph circuit IN general use we can
do ten times as much. these increased
results arc attained without IN any way
lmpairing the quality Of telegraph work
ing.
.~rhc nature Of these developments
is such that il desired wires may bc used
partlv for telephone and partly for telc-
graph 4 pair Of wires is available either
for five simultaneous telephone converse
tions or for forty simultaneous telegraph
messages or partly for one and partly for
the other
.An installation of the multiplcy
telephone system has hccn made between
Baltimore and Pittshurg and has been
in service for more than . month. On
Monday afternoon OF this week, accom-
panied hy party Of distinguished gov
ernmcnt and telephone and telegraph
officials, | made InSpcnCtlon OF thus
system 1T Baltimore and test OF the
service provided by il between Baltimore
and Pitisburg. All Of the party were dc
lighted with the successful working Of the
new system and the evident skill which
had been shown in developing IT,
These developments have been the
result OF the work Of tho technical staff
OF the Bell system, acting as an organi-
cation. and are the out growth OF their
combined inventive and engineering skill.
Hundreds Of the men OF our staff have
co-operated in the work, and 1t IS I'M
TDOSSINlC 10 DaUte any bIt HldAI WIZ L
entitled To even the major part OF the
result. Without, however, detracting
from the credit due to any one OF them,
there are a few whose contributions to
the system have been so distinctive that
they should be named here. They are
q. B. Blackwell, G. A. Campbell. II. :
Osborne. J. r. Carson, Lloyd Espenschied
II. A. AfTel and John Davidson, Jr., oi
| the engineering department OF the Amer
lean Telephone and Telegraph Company,
and T. H. Colpitts. II. D, Arnold. b. "
| Kendall, r. 4 Heising, II. j. Venues, f.
! O. Scriven and Ii. f. kortheuer, OF the
engineering department OF the Western
! Electric Company, the manufacturing
| division Of the Bell system.
! TELEGRAPH PROBLEM SOLVED.
From the earliest days Of both the
telephone and the telegraph there have
| been almost numberless attempts by IN
ventors, scientists and engineers to dc
velop methods for the multplex trans
mission OF messages 1t was while work
ing on the problem Of multiplex teleg
raphv that Doctor Bell had his first con
ception of the structure of the orgina
telephone Now the organization, which
is continuously working to perfect thC