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Патент USA US2405603

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Aug, 13, 3946.
Filed Dec. 31, 1942
_ 3 Sheets-Sheet 1
?Ms,- M
i3, 146.
R. D. PARKER? :1" AL
?Filed Dec. 51, 1942
s Sheets-Sheet 2
F763 ;
?38% 33} 146.
Filed Dec. 31, 1942
5 Sheets-Sheet 3
FIG. 4?
F/G. 5
UN/ 73
CAMS? C005 ' '
F/G- 5
new: CAMS c0015
0-9 0/? 9-0
77/555 POI/V729
3 4
TENS cups
occue AT?
5 l
W. T. REA.
Patented Aug. 13, 1946
Ralzemond D. Parker, Brooklyn, Wilton T. Rea,
Manhasset, and Fred J. Singer, Rockville
Centre, N. Y., assignors to Bell Telephone Labo
ratories, Incorporated, New York, N. Y., a cor
poration of New York
Application December 31, 1942, Serial No. 470,774 ,
10 Claims.
(Cl. 177?-351)
This invention relates to data transmission
rangement wherein each selection is under com
plete control of the sending mechanism and the
systems and particularly to permutation code
signal data transmission signal systems.
selection is made in accordance with codes sent
over the transmission channels and it is not
necessary to lock up the decoding apparatus in
the receiver.
A further feature of this invention is an ar
rangement in which a false selection due to
?line hits? or other extraneous interferences will
More particularly, this invention is a permu
tation code signal data transmission system ar
ranged for high speed transmission of data sig
nals with a high degree of accuracy.
? The data transmission system of this invention
is arranged so that two complete groups of per
mutation code signal elements, each completely 10 be retained only during the period of interfer-,
de?ning a portion of a multidigit number, are
ence and the correct selection will be reestabl
impressed on two- multiconducting channel trans
lished immediately thereafter. That is to say,
mission circuits simultaneously. That is to say,
four signal elements in accordance with one per ? '1
mutation code are impressed simultaneously on 15
four separate conducting channels comprising a
?rst transmission circuit to completely de?ne
a digit in the right-hand position of a multi
digit number. Four signal elements in accord
ance with a second permutation code, independ 20
ent of the ?rst code, are impressed simulta
neously on four separate conducting channels
comprising a second transmission circuit to com
pletely de?ne the digit in the second position
no false signal due to a hit or other trouble
condition is ever stored.
A further feature of this invention is an
arrangement which minimizes troubles caused by
interchannel inductance, as current and voltage
changes at the sender are made on only one
channel of the entire system at a time.
A further feature is an arrangement in which
errors in decoding are minimized because the
code combinations assigned to successive points
on the transmitting mechanism differ by one
, element only, so that on transitions between suc
from the right in the same multidigit number.
At the receiving station, a separate high speed
receiving circuit is provided for each transmis
sion circuit. Separate decoding circuits are also
provided for each transmission circuit.
With four conducting channels each arranged
the resultant selections at ?the receiving
station will be one or the other or both of two
cessive points, particularly where the change in
data and the corresponding change in the mech
anism are slow, and successive positions on the
transmitting cams may be bridged by their fol
ditions, it is possible to transmit 24 or sixteen
di?erent sets of signals. Only ten of these are
adjacent and consecutively numbered? indicators,
corresponding to the positions between which
the transmitter is moving, rather than a false
employed to designate any of the ten different '
random selection of an indicator at wide vari
digits for a particular place.
By providing four independent channels for
each circuit, it is possible to impress all of the
signal elements necessary to designate any par
as would be the case if the codes were randomly
transmission simultaneously of the permutation
code signals necessary to designate a multidigit
number having any number of places.
two-wire system or a voice frequency system
superimposed on a radio link.
to transmit a permutation of two electrical con
ance with the true position of the transmitter,
assigned to transmitter positions.
A further feature of the invention is that the
ticular one of the ten digits in a particular place
sending and receiving apparatus will function
in the number on each circuit simultaneously. 40 with practically any type of telegraph transmis
The apparatus may be expanded to care for the
sion system, such as a voice frequency carrier,
These and other features may be understood
45 from the following description when read with
ment which provides for very speedy selection
reference to the associated drawings, in which:
in that a sufficient number of transmission chan
Fig. 1 is a plan View partly in section of the
nels are provided between the sender and the
transmitting apparatus;
receiver to preclude the need of time discrimina
tion within each code, and the coding apparatus so
the transmitting apparatus;
at the sending end and decoding apparatus at
Fig. 3 is the left-hand portion of the circuit of
the receiving end are capable of very high speed
the invention;
operation of the order of three hundred selections
A feature of the invention herein is an arrange
per second.
A further feature of this invention is an ar
Fig. 4 is the right-hand portion of the circuits
55 of the invention; and
Figs. 5 and 6 are code diagrams used in ex
of twenty consecutive numbers before repeating
to de?ne the digits in the units place for the suc
ceeding twenty numbers on the next rotation.
Vertical columns I, 2, 3 and 4 of Fig. 5 per
tain to cams II ?I, H8, H9v and I20, respectively.
plaining the invention.
Refer to Figs. 1 and 2. Secured in housing
I0! are two sets of opposed bearings I02, I03, I04
and I05. Shaft I06 is journaled in bearings M2
and I03. Shaft I01 is journaled in bearings I04
and I05. Crank I00 is rigidly? secured to the
The periphery of each of cams II?I to I20 may
be assumed to be divided into twenty segments
of equal length arranged in two levels, normal
disk I09 is also rigidly secured to shaft I06, inter
and depressed. Each of columns I to 4 in Fig. 5
mediate crank I08 and bearing I03. Disk I09 is 10 is divided horizontally into twenty rectangles each
right-hand end of an extension of shaft I06. A
graduated near its periphery in one hundred
corresponding to one segment.
equal divisions. Pointer H0 is secured to hous
ing IOI and is arranged to register with the di
twenty horizontal lines of rectangles indicates
the condition of each of cams III to I20 in a
visions on disk I09 as disk I09 is rotated.
particular one of the twenty different cam posi
Each of the
III and cams II2, I13, H4 and II5 are each rig 15 tions. Where a cam position is normal, the rec
idly secured to shaft I00. Gear H6 and cams I I1,
tangle is blank. Where a cam position is de
H8, H9 and I20 are rigidly secured to shaft I01.
pressed, the rectangle is cross-hatched. The
Gears III and H0 engaged. .The gear ratio is. such
combination of normal and depressed cam seg
that as crank I08 and gear III turn through one
revolution, gear II 6 revolves ?ve times:
ments in a particular horizontal row forms a per
20 mutation code de?ning a corresponding digit of
Cam arm shafts I30'and I32 are secured in the
the group 0 to 9, 0 to 9 in the adjoining left
right and left-hand walls of housing IOI. Cam
hand vertical column. The codes de?ning units
arms I2-I and I24 are mounted on shaft I30 and
digits 0 to 9 respectively, in numbers having even
cam arms I25 to I28 are mounted on shaft I32.
digits in the, tens position, correspond to the
As may be seen in Fig. '2, the left-hand ends of 25 units codes de?ning digits 9 to 0 respectively,
lever cam arms I2I to I24 engage the peripheries
in numbers having odd digits in the tens position.
of cams I I2 to H5, respectively. The left-hand
In other words, the codes for units digits 0 to 9
ends of lever cam arms I25 to I28 engage the
for even tensv are repeated in reverse order to
peripheries of cams II'I to I20, respectively. An
de?ne units digits 0 to 9 for odd tens. This may
individual spring, such as I29, secured to the 30 be observed from the code pattern for the top
right-hand end of lever arms I2I_ to I24 tends to
and bottom group of ten horizontal lines in Fig. 5,
each of which is the inverse of the other so that
rotate each lever arm in a counter-clockwise direc
only ten different permutation code signal com
tifo'n about shaft I30 in which each of lever arms
I2I'to I24 is journaled. A corresponding spring,
binations are employed.
such as I3_I, attached to the right-hand end of 35 Refer now to Fig. 6. Columns I, 2, 3 and 4
in Fig. 6 apply to cams H2, H3, H4 and H5, re
each lever arms I25 to I28 tends'to rotate each
spectively. The vertical columns in Fig. 6 are
of these arms in a counter-clockwise direction
divided horizontally into ten rectangles. The
about shaft I32 in which each of arms I25 to
I281 is journaled. The left-?hand ends of cam
peripheries of cams II2 to H5 are assumed to be
arms I2I to I28 are thus maintained in engage 40 divided each into ten segments of equal length.
ment with their corresponding cams as the cams
Cross-hatched and blank rectangles have the
are rotated.
same connotation as in Fig. 5.
Secured to the right-hand end of each of arms
I2I- to I28, by two screws, such as I33 and I34,
and separated from each arm? by an individual
strip of insulation, such as I35, is a contact spring,
such as I36, which engages a corresponding ad
justable screw contact stud, such as I31, mount
ed in a ?xed nut, such as I38, secured to the
right-hand inner wall of housing IM and in
sul'ated therefrom by an insulator, such as I39.
Each pair of contacts, such as I36 and I31,
coacts to interrupt the now of current through a
corresponding pair of conductors which extend
Each horizontal row in Fig. 6 corresponds to
a code set up on cams II2 to H5 to de?ne a dif
ferent digit in the tens position in a multidigit
number. _ The numbers 0 to 9 in the vertical col
umn at the left of Fig. 6 are the digits de?ned
by the code in the corresponding horizontal col
shown in Figs. 5 and 6 each of the eight cams
a is 1?
cut in accordance with a code pattern arranged
with only one change in condition in going from
one step to the next, either within the tens group
or Within the units group. Furthermore, when
through an opening I42 in the housing. One of 55 there is a transition from one code within the
each of the eight pairs of wires is connected to
tens group to the next, there is no transition in
ground and the other extends to the receiving
code in the units group because the arrangement
station. The eight conductors extending to the
of cams is such that the transition between tens
receiving station correspond to conductors 34I to
groups occurs at points where the units code is
00 the same for two adjacent steps. It is for this
34s in Fig. 3.
reason that the units code is arranged with one
code sequence for each odd tens zone and another
tude of a measured quantity, such as the size of
code sequence which is the inverse of the ?rst for
an angle. For instance, shaft I06 may be cou
the even tens zone.
pled in any convenient manner to means for con 65
Refer now to Figs. 3 and 4. Cams II2 to H5
trolling the movement of an azimuth instru
which control the transmission of the code sig
ment in which case the transmitter would be
nal combinations de?ning the digits in the tens
used for transmitting permutation signals to de
place and cams II'I to I20 which control the
?ne the size of a changing angle. It is to be
transmission of the code signals which de?ne the
70 digit in the units place are shown at the left of
understood, however, that it is not so limited.
Refer now to Fig. 5. Fig. 5 showsis diagram
Fig. 3. Cams II2 to H5 control the opening. and
matic form the manner in which the peripheries
closing of contacts 30I to 304. Cams I I?! to I20
of cams II?! to I20 are arranged to transmit
control the opening and closing of contacts 305 to
twenty sets of permutation code signals. for each
308. Circuits may be traced from positive bat
' The mechanism per Fig. l and Fig. 2- is adapted
to be operated to follow the changes in magni
rotation to de?ne the digits in the unitsplace 75 tery through, the bottom windings of relays 309
to 3l6' and through resistances 3" to 324 to
ground. The effect of current ?owing in these
relays 351 to 318 will be actuated towards the
circuits tends to actuate the armatures of relays
309 tov 3l6 to the right and is effective when no
The armature of a particular relay in the -re
lay group 351 to 361 will, therefore, be actuated
either to the right or to the left for each code
combination de?ning a particular digit in the
tens place dependent upon the manner in which
the right to engage contacts 349 to 356 to each
its controlling cam is cut as indicated in Fig. 6.
of which grounded positive battery is connected.
Similarly, the armature of a particular relay in
When cams I I2 to I20 raise their respective arms,
contacts 30l to 398 are closed establishing cir 10 the relay group 368 to 318 will be actuated either
to the right or to the left dependent upon the
cuits from ground through contacts 30! to 308,
manner in which its corresponding cam is cut as
through conductors? 34! to 348 connecting the
indicated in Fig. 5._ The group of relays 351
transmitting and receiving stations, variable re
to 361 will make ten di?erent selections, one for
sistances 325 to 332 and the top windings of re
each cam code combination to connect positive
lays 389 to 316 to battery. Current ?owing in
battery 395 to some one of the ten conductors 490
any of these circuits will actuate the armature
of the corresponding relay to the left to engage ' to 409, each of which connects to a different group
of ten lamps in Fig. 4. For the condition in which
its associated contacts 333 to 340.
the tens cams and their corresponding relays are
When the armature of relay 309 engages con
tact 333, a circuit may be traced from ground 20 shown in Fig. 3, namely, with contacts 30I to 304
closed, the armatures of relays 399 to M2 actu
through contact 333 and the windings of polar
ated to the left and the armatures of each of the
relays 351, 358, 359, 369 and 36! to the mid-point
relays 351 to 361 also actuated to the left, a cir
of the potentiometer which extends from ground
cuit may be traced from positive battery 395
through resistance 319, resistance 380 to ground;
through resistance 396, armature of left-hand
ed positive battery. When the armature of re
contact of relay 351, armature and left-hand con
lay 3|0 engages contact 334, a circuit may be
tact of relay 365, armature and left-hand contact
traced from ground through contact 334 and the
of relay 362, armature and left-hand contact of
windings of polar relays 362, 363 and 364 to the
relay 351 to conductor 400 which connects to the
mid-point of a potentiometer which may be traced
left-hand terminal of each of the ten lamps in
from ground through resistances 385 and 332 to
the 0 to 9 bank in parallel.
grounded positive battery. When the armature
The group of relays 368 to 318 will also make
of relay 3? engages contact 335, a circuit may
ten different selections, one for each of the ten
be traced from groundthrough contact 335 and
different code combinations shown in Fig. 5, to
the windings of polar relays 365 .and 369 to the
mid-point of a potentiometer which may be traced 35 connect ground 391 to some one of the ten con
ductors 4m to M9 each of which connects a dif
from ground through resistances 383 and 394 to
ferent group of ten lamps in Fig. 4.? Forthe
grounded positive battery. When the armature
condition shown with the armatures of all of the
of relay 3|2 engages contact 336, a circuit may
relays 368 to 318 actuated to the left, a circuit
be traced from ground through contact 336 and
the winding of polar relay 361 to the mid-point 40 may be traced from ground 391 through the ar
mature and left-hand contact of relay 318, ar
of a potentiometer which may be traced from
mature and left-hand contact of relay 316, ar
ground through resistances 385 and 386 to
mature and left-hand contact of relay 313, arma_
grounded positive battery. When the armature
ture and left-hand contact of relay 363 to con
of relay 3l3 engages contact 331, a circuit may
be traced from ground through contact 331 and ' ductor 410. Conductor 410 connects'to a total
of ten lamps in the indicator bank in Fig. 4, ?ve
the windings of polar relays 368, 369, 310,-31I
in the left-hand vertical column and ?ve in the
and 312 to the mid-point of a potentiometer
right-hand vertical column. The reason for'the
which may be traced from ground through re
division between the two columns will become ap
sistances 381 and 388 to grounded positive bat
tery. When the armature of relay 3?! engages 5 parent from the description hereunder.
For each of the other distinctive code com
contact 338, a circuit may be traced from ground
binations shown in Fig. 5 a path will be estab
through contact 338 and the windings of polar
lished from ground 391 to some other particular
relays 313, 314 and 315 to the mid-point of a po
one of the nine other conductors, 4!! to 1H9.
tentiometer which may be traced from ground
through resistances 389 and 390 to grounded posi- 3'; Each one of these conductors is arranged in a
manner corresponding to the arrangement of
tive battery. When the armature of relay3l5
conductor M3 in that each connects to a total
engages contact 339, a circuit may be traced from
of ten lamps, ?ve in each of two of the vertical
ground to contact 339 and the windings of polar
columns in Fig. 4. The ten conductors 4?! to 4 l9
relays 316 and 311 to the mid-point of the po
tentiometer which may be traced from ground CO will serve all hundred of the lamps in Fig. 4.
Selecting relays 368 to 313 cooperate to supply
through resistances 39I and 392 to grounded posi
ground to the right-hand terminal of ten lamps
tive battery. When the armature of relay 3|6
arranged vertically while relays 351 to 361 coop
engages contact? 340, a circuit may be traced
erate to supply battery to ten lamps arranged
from ground through contact 340 and the wind
ing of polar relay 318 to the mid-point of a po (35 horizontally in the bank of Fig. 4. This results
in the selection of one lamp of the hundred lamps '
tentiometer which may be traced from ground
to de?ne the position indicated on disc I09.
through resistances 393 and 394 to grounded posi_
Attention is again particularly called to the
tive battery. When such circuits are established,
fact that in any transition from the code de?ning
the armatures of relays 351 to 318 will be actu 70 a particular digit in either the units or tens places
ated towards the left. When the armatures of
to the code for the next higher or lower digit, it
relays 309 to 3I6 are actuated towards the right
is necessary to change the electrical condition of
. to engage contacts 349 to 356, positive battery
only one of the four conductors of either circuit.
instead of ground will be connected to the ar
For instance, the code for 0 in the even tens zone '
current is ?owing through the top windings of
these relays to actuate their armatures towards
matures. - In response to this, the armatures of 75 as shown in Fig. 5 requires that groundbe con,
nected to each of conductors 345 to 348 in Fig. 3.
The code for 1 in the same zone requires a single
change only, namely, that'ground be removed
from conductor 355. In going from 1 to 2 in the
same zone, a single change will be required, name
?number,? etc, be construed broadly to include
all possible systems of numeration.
What is claimed is:
1. In an electrical data transmission system,
CR. a transmitting station, a receiving station, a ?rst
ly, ground will be removed? from conductor 341.
multichannel transmitting circuit connecting
The same condition applies on each transition.
said stations, means at said transmitting station
for impressing on each of said channels simulta
neously a signal element of a ?rst permutation
In changing from the units digit 9 in the even
tens zones to the units digit 6) in the odd tens
zones, it is not necessary to. change the condition
of any of conductors 345 to 348.. This is apparent
from Fig. 5 which indicates conductor 345 re
mains. open and ground remains connected to
each of conductors 346 to 348.for each of these
codes. The change is effected by changing the
code for the tens cams, and from Fig. 6 it is
apparent that no matter whether the change is
from 9 to 10, from .29 to 30, or 49 to 50, etc., the
condition of only one conductor of the four tens
conductors 3!? to 344 is changed.
Reference to the top and bottom horizontal
lines of Fig. 5 show that the code for units digit
code combination in a ?rst multielement permu
tation code to completely de?ne any one of ten
digits in a ?rst particular position in a multi
digit number, a second multichannel transmit
ting circuit connecting said stations, means at
said transmitting station for impressing on each
of said second channels simultaneously a signal
element of a second permutation code combina
tion in a second multielement permutation code,
independent of said ?rst code, to completely de
?ne any one of ten digits in a second particular
position in said multidigit number, means in said
system for de?ning consecutive numbers in se
0 in the even tens zone is the same as the code
quence, means, comprising instrumentalities for
for units digit 9 in the odd tens zone, so that
inverting the sequence of the code signal combi
there is no change in the condition of conductors 25 nations de?ning successive groups of ten digits
345 to 348 on transition between 19 and 20, 39 and
in said ?rst position of said number, at said
40, etc. The change is again effected by a change
transmitting station for changing the condition
in the condition of a single conductor of the tens
of not more than one signal element of the total
group 34] to 344.
signal elements comprising said two code com
Therefore since the four units code conductors
binations on transitions between any successive
remain unchanged on such a transition, while but
code settings and means at said receiving station
a single change is made in the condition of the
for identifying consecutive numbers in response
four tens conductors, the change in the electrical
to all of said consecutive settings.
condition of the eight conductors comprising the
2. In an electrical data transmission system
system is limited to a single change in the con
arranged to de?ne progressive or retrogressive
dition of a single conductor while the other con
sequential measurements in terms of consecu
ductors are maintained in their former condition.
tive multidigit numbers, a measuring station, a
This limits the transmission of signals to the ab
receiving station, a plurality of circuits each hav
solute minimum and maintains the eifect of in
ductive disturbances caused by signal changes to
a minimum.
It is particularly pointed out that a number
having any number of places may be instantly
de?ned in this manner and further ?that it is
necessary to change only one signal element on
transitions between consecutive numbers what
ever the number of places.
It was mentioned heretofore that the ten con
ductors M0 to 419 which control the selection of
, ing a plurality of separate transmission chan
nels interconnecting said stations, means at said
measuring station for generating a separate
multielement permutation code signal combina
tion to completely de?ne each separate digit in
each place in each of said numbers correspond
ing to each of said measurements, means at said
measuring station for transmitting each separate
element of each of said multielement code com
binations de?ning each of said digits of any of
said multidigit numbers over a corresponding
the units digits are not connected to all ten lamps 50 separate one of said channels, means at said
corresponding to the same digit in a particular
measuring station for transmitting all of the ele
vertical row in the indicator bank but are con
ments of each particular combination simultane
nected instead to ?ve lamps in each of two dif
ously, means at said measuring station for trans~
ferent vertical rows corresponding to two different
mitting all of said combinations corresponding to
unit digits. For instance conductor 4H] connects 55 any particular multidigit number simultaneously
to lamps 0, 23, 40, 60 and 83 in the right-hand
and means at said measuring station for chang
vertical row and to lamps I9, 39, 59, 79 and 99
ing one element only in one of said channels only
in the left-hand vertical row. This is necessary
to de?ne any multidigit number on a transition
as the same units code is used for two dilferent
from any multidigit number to any consecutive
units digits, namely, the even 0?s and the odd 9?s . . multidigit number.
as shown in Fig. 5. Each of the ten distinctive
3. In an electrical data transmission system,
codes is used twice as shown in Fig. 5 to de?ne
four separate transmission channels comprising
two different groups of live numbers each. The
a ?rst circuit, four separate transmission chan
units digit is the same within each group of ?ve
but different for the twogroups. So the wiring
of the lamp indicator bank must correspond to
the repeated inverse code of Fig. 5.
This invention is described by reference to an
exemplary system employing a 4-unit code and
the decimal system but its principles are appli~
cable to systems employing other multiple unit
nels comprising a second circuit, means connect
ed to said channels in said ?rst circuit for im
pressing a signal on each of said channels in
said ?rst circuit simultaneously, to de?ne any
digit of ten digits in the units place in a num
ber, means connected to said channels in said
second circuit for impressing a signal on each
of said channels in said second circuit simulta
neously to de?ne any digit of ten digits in the
codes and other numerical systems such as the
quintesimal system or the duo-decimal system or
tens place in said number and means connected '
to mixed systems; it is therefore the intention
to said channels for changing a signal on one
that the expressions ?digit,? ?multidigit number,?
only of said eight channels on transitions from
one to another of any consecutive two-digit num
1i. In an electrical multielement permutation
four channels of each of said circuits substantial
ly instantaneously, means connected to said
code signal data transmission system compris
ing a plurality of multichannel transmission cir
cuits arranged to de?ne a plurality of digits in
a multidigit number simultaneously, means for
channels at said ?rst station for changing one
of said elements only on one of said channels
only of one of said circuits only on each one of
one hundred changes to de?ne each one of one
hundred consecutively numbered digits, and
transmitting a complete multielement permuta
means, connected to said channels at said sec
ond station, for selecting in sequence each one of
tion code signal combination over each of said
circuits at substantially the same instant to 10 one hundred consecutively numbered indicators
in response to said changes.
completely de?ne separate portions of said num
9. A measuring device, a ?rst and a second
ber substantially simultaneously, and means for
transmission circuit each comprising four ,sep
varying the electrical condition of only one sig
arate channels connected to said device, means
nal element of all of the signal elements in the
for impressing four signal elements of each of
combined code combinations de?ning any mul
a ?rst and a second code combination in a ?rst
tidigit number to de?ne a consecutive multidigit
and a second multi-element permutation code
individually on said four channels of each of
5. In an electrical permutation code data
said circuits simultaneously, to de?ne a two-digit
number corresponding to a measurement by said
device, in response to the operation of said de
vice, and means for changing one signal element
only of one of said combinations only, on transi
tions between any consecutive measurements by
impressing ten di?erent multielement permuta 25 said device, to de?ne said measurement in terms
of a corresponding two-digit number.
tion code signal combinations on each of said cir
10. In an electrical multielement permutation
cuits to de?ne ten different digits in each place
code data transmission system, a transmitting
in said number and means for changing the sig
station, a single measuring device thereat, a ?rst
nal impressed on a single one of said channels
only to de?ne all consecutive numbers.
30 and a second group of electrical impulse trans
mitting contacts thereat, each group comprising
6. In an electrical data transmission system,
at least three contacts, a ?rst and a second trans
means for transmitting 12. separate permutation
mitting circuit, each circuit comprising at least
code signal combinations, where n is any number
three separate transmitting channels, one for
greater than one, to de?ne any ?rst multidigit
number having 11. places in said number, means for 35 each of said contacts, connected individually to
said contacts, a receiving station, means for ex
retransmitting said combinations while varying
tending said channels to said receiving station, a
the condition of a single signal element only of
transmission system, a plurality of multiconduct
ing channel transmission circuits each having a
separate conducting channel for a correspending
signal element of a multielement permutation
code signal combination completely de?ning a
separate digit in a multidigit number, means for
a single one of said combinations of said 11, com
binations on all transitions between all consecu
tive numbers and means, responsive to the re
ception of said retransmitted combinations hav
ing said single varied element, for establishing
a selection de?ning a second multidigit number,
consecutive respectively to said ?rst multidigit
7. In an electrical data transmission system,
means for transmitting a plurality of ?rst multi
element permutation code signal combinations in
accordance with each of a plurality of separate
codes simultaneously to de?ne a plurality ?of
parts of any ?rst multidigit number, means re
sponsive to the reception of said ?rst combina
tions for establishing a selection de?ning said
?rst number, means for maintaining all of the
signal elements of all said ?rst combinations un
changed, except one signal element of one of
?rst and a second group of receiving relays, a
?rst and a second decoding circuit, and a bank
40 of indicators, all at said receiving station, means
responsive to the operation of said measuring de
vice for measuring a quantity expressible as a
multidigit number, means responsive to said
measuring operation for translating said number
,r. Cal into two separate combinations of permutative
settings of said contacts simultaneously, means
responsive to the setting of said contacts for
impressing a separate multielement code com
bination of electrical impulses on each of said
50 circuits simultaneously, one impulse on each of
said channels, means responsive to the reception
of said impulses at said receiving station for es
said ?rst combinations only while changing said
one signal element, to de?ne a plurality of parts
of any second multidigit number consecutive to
said ?rst number, means for transmitting said
second combinations de?ning said second num
ber, and means responsive to the reception of said
combinations de?ning said second number for
effecting a selection de?ning said second num
8. In a data transmission system, a ?rst sta
tion, a second station, four separate transmis
sion channels in a ?rst circuit and four separate
transmission channels in a second circuit inter
tablishing a ?rst and a second multielement code
combination of permutative settings of relay con
tacts of said ?rst and second group of relays,
means responsive to the establishing of said relay
contact settings for controlling the operation of
said decoding circuits, means responsive to the
operation of both of said decoding circuits for
establishing a single selection of an indicator
in said bank to de?ne said multidigit number,
means in said system for translating all succes
sive measurmen-ts into consecutive multidigit
numbers and means in said system for changing
the setting of a single one of all of said trans
mitting contacts only on any transition between
consecutive measurments, to e?ect a correspond- '
ing change in said indicator by the transmission
of a single signal element only in one or the other
connecting said stations, means connected to said_ 70 of said two code combinations over one of said
channels for de?ning two digit numbers substan
tially instantaneously, said means comprising in
strumentalities, at said ?rst station, for impress
ing a ?rst and a second code combination, of
four signal elements each, individually on said 75
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