Omaha daily bee., 1911-07-05

matte system being best suited for long
lines, and the multiplex for lines Of aver
age length. In the automatic system the
messages were first perforated on a strip
of paper tape in the baudot five-unit alpha
bet. The perforated tape was then used to
transmit the messages by means OF an
automatic transmitter working on the prin-
ciple OF the jacquard loom. The speed OF
transmission Of the signals was from 100
to $50 words 600 to 1880 letters) minute.
and at the receiving station the arriving
signals were recorded at the same speed as
perforations in second paper tape. which
was an exact replica of the transmitting
tape. The reproduced tape at the receiving
station then served to operate an auto
matte typewriter somewhat on the prin-
cipie of mechanical piano The telegraph
line was worked duplex. giving one trans
mission in each direction simultaneously
on. the one wire. The rsca,vsd messages
were printed in Roman type In page form.
at speeds ranging up to about 40 v ords
minute dwenty letters a second).
This system showed to advantage only
in respect of saving Of line. The cost CT
office equipment was greater than with
the Murray muluplex, there was less saw
GAs
there might be loss Of time If the work.
ing arrangements were not good. This was
especially the case II the system was
worked at a high speed In order to carry
heavy traffic. The working organization
in this case must be first-class, or there
would be a great reduction in the carrying
capacity OF the system. On long lines,
1000 miles and over. the saving of time
md lalN.N -
than increase in the carrying capacity of
the line, provided always that telegraph
traffic was growing rapidly so as to render
increase Of carrying capacity important
The relative advantages and disadvan-
tages of automatic and multiplex printing
telegraphs appeared to be obvious, and
were now tolerably familiar to telegraph
engineers. The idea OF combining the ad-
vantages of the automatic and multiplex
systems led to the development OF the
Murray multiplex printing telegraph It
was only about year since this system
had passed out OF the laboratory stage ana
had arrived at practical success. In null
tiplex system the instrument correspond
Ing to the Wheatstone automatic trans
mitter was the distributor, and the Murray
multiplex system might be said to be
founded on the Baudot because IL had
taken the Baudot distribtlt0r as it's basis.
For driving the distributors, however. in
stead OF the Baudot arrangement the De-
ianey multiplex plan OF using the Lacour
phonic wheel motor was adopted. Apart
from the distributors, the only resemblance
between the Baudot and the Murray multi
pick was In general principles, and in the
use OF the Baudot alphabet The Murray
muitiplex Transmitting and printing ma
chimes closely resembled the corresponding
Murray automatic instruments; indeed
many were identical. The normal speed
OF the Baudot was thirty words a minute
tor each transmission. In the Murray
multplex the speed was raised 10 FORTY
words minute. in order to Increase the
efficiency Of the labor at both ends OF the
line. II was possible that under certain.
conditions 1t might prove advantageous 10
Increase the speed still further to forty-five
or nfty or even sixty words minute
rhere were considerable possibilities OF
both capital and labor saving by such in
creased speed and the Murray multiplex
nae the advantage OF easy adjustment of
speed over considerable range from
twenty up TO forty-five, and possibly sixty
OF more words a minute for each transmits
sion or channel.
Like the Baudot and similar systems. the
sierray multiplex printing telegraph d.
vided up the line time 90 as to give sew
erai transmissions or channels on one tele-
graph wire. each at comparatively Low.
speed suitable for the work of one operator
sendins and one receiving. Two distrib,l-
eors' identical In design. were employed
one at each end OF the telegraph line
tsta'ion and station b The distributor
Al station sent out a governing impulse
once Tor each revolution OF the contact
arm uour revolutions second for forty
words minute). This impulse controlled
the speed and phase of the distributor al
station b SO as TO keep II running IN syn
chronism with the distributor at station
A. The distributor used In the Murray
muluplex was double giving two
Simultaneous transmissions tVsskinE sim
PICK and four when working 'DipIex. The
new system might also be NoFsed triple