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Sept. 24, 1946.
F, H, FAY ET AL
2,408,304‘
TELEGRAPH REPEATER SYSTEM
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File‘d Oct. 22, 1945
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INVENTORS
ZEZZZlg/?EWeeUe
’
BY
' _
.
a
ATTORNEY
Patented Sept. 24, 1946
2,408,304
UNITED ' STATES PATENTS OFFICE
; 2,4683% ‘ _
TELEGRAPH REPEATER SYSTEM
Frank Homer Fay, Huguenot Park, N. Y., and
Elmer William Reeve, Blain?eld, N. J _., assignors
to American Telephone and Telegraph Com
- pany, a corporation of New York
'
Application 0ctober122, 1943, Serial No. 507,230
5 Claims.
~
1
1
(01.178-73) -
.
This invention relates to telegraph systems.
L1, L2 and L3, respectively. Station A includes a
key K1 and a sounder SD1, the station B a key K2
More particularly, this invention relates to re
peaters for telegraph systems which are ‘arranged
and a sounder SD2, and station C a key K3 and a
sounder SDs. The line L1 connects station A‘
with the line terminal of a repeater RP1 at sta
tion D. The line L2 connects station B with the
line terminal of a repeater RP2 at station D.
to repeat signals simultaneously from‘ any one of ._
a plurality of stations to all of the other stations
of the system.
,
,
,'
,
Heretofore two telegraph. stations were con
nected to each other by two repeaters having bal
The line 1L3 connects station'C, with the line ter
minal of-a repeater RPa at station D. The loop
ing associated with each telegraph ‘station, each 10 terminalsof repeaters RP1 and RPz are connected
repeater serving to repeat the signals in opposite
to each other through the equipment of a tele-l
directions between‘ the station. with which it is ' graph station TSv and through a circuit of re-‘
associated and the repeater associated with’the ' peater RP3 which maybe considered as the loop
anced or di?erential loops, one of suchloopsbe- , ,
other telegraph set; When adding a third tele- , _
graph station having a balancedor differential
loop, the balanced‘ loop system-.beinga'rranged
to permitsignaling from. any one of the tele
graph stations to theother stations, simultae
315
of repeater R133;v The telegraph. station TS“ in,
cludes a key Kioand a, sounder SD10. This tele
graph station may be located at the repeater sta
tionD or it maybe some distance away from the
The circuits of repeaters
neously, it, has been necessary heretofore‘fnot, ~ RP1 and RP; are of ‘the. balanced or differential
alone to provide av third :re'peater similar ‘tothe ‘20 loop type and are the same as those heretofore
other two,‘but also to ‘furnish a single line'fret
embodied in repeaters interconnecting two tele
peater as a fourth repeater. Unless‘ the fourth
graph stajtions‘such as A and B. The third re
or single line repeater was" added tothev other
three repeaters of the system, it was impossible .,
to transmit signals from any one, of the stations
to all of the other stations simultaneously. "
In accordance "with this. invention itris pro
posed to interconnect three or more stations to
repeater station D.
peaterRPa at station D, however, hasbeen modi
?ed so that ‘it may be joined to the loop termi
nals‘of the other tworepeaters at station D,t0
enable,’ signals to be transmitted from vany one
of the three (or more) stations to the other sta
tions of the system simultaneously.
.
each other by but three repeaters and arrange
When no signals are being transmitted through
the system so that any one ofthe stations, may‘ 30 the system, the keys at the various stations will
transmit signals to all of the other ‘stations
be in their closed positions. The .current trav
simultaneously. More generally, it, is proposed
ersing the upper winding of the receiving ‘relay
to interconnect three or more di?'erenttelegraph ' RRi of repeater RPi will be in a marking. direc
stations to each other by repeaters which ‘are
.tion and this vcurrent will exceed the current in
equal in number to the number of telegraph sta- ‘
a spacing direction traversing its‘ lower wind
tions in the system. The arrangement proposed
ing, thereby holding the armature of relayl'RRi
- in accordance with this invention will omit the '
on its marking contact M. There will also be
single line repeater such as has‘beenfoundnec
a large flow of current through. the. upper wind
essary heretofore in such installations. ‘The oInis- _ ' ingsof the sending and break relays SR1 and
sion of the single line repeater considerably re'-' lie BK1 of repeater RP1, and through the lower wind
duces the amount of equipment‘ requiredv for in
ings of ' the break and sending relays BKgjand'
terconnecting three or vmore stations andfthere
SR2. This current will be‘ in a marking direc
fore, materially reduces they cost ‘and ‘meme,
nance of such systems' The proposed'invention
is especially useful at times whenit' is‘imp'os
sible to obtain such additional equipment,
This invention will be better understood from ‘
the more detailed description hereinafter follow
ing when read in connection with the ,_ accom
’tion and su?icient in magnitude toovercome the
spacing current ?owing'in'the otherwindings of
these relays. 'Thus the armatures of relays SR1,
BK1, 3K2 and‘SRzwill‘be held on their marking "
contacts M. The marking currents just referred
to will flow over a circuit which includes bat
tery [Bathe armature and marking‘ contact M
,panying drawing showing one'embodiment of the‘ - of relay RRrthe upper windings o'f relays SR1
‘invention merely for the purpose of illustration. 4 and BKI, resistor Z1, the upper winding of ‘relay
Referring to the drawing, three telegraph sta
SR3 'of repeater RPs', the armature and marking
tions located ‘at widely, diiferent points and'des
ignated .A, B and C are shown connected‘to'a
common repeater station D 'by means of lines
c'o'n'tact M of relay BK3 of repeater RP3, key K10
‘and thewinding of sounder SD10 of telegraph sta
tion TS, resistor Z2, the lower'windings of relays
I I
2,408,304
’ 3
BK2 and SR2, the armature and marking con
tact M of relay RRz, battery Be and ground.
There will also be a flow of current in the upper
winding of the receiving relay RRz in a marking
direction and of a magnitude which will exceed
the current in the lower winding of this relay
4
air,” the current from battery B7 previously ?ow
ing through the lower winding of relay SR3 will
be removed from this lower winding and hence
the ‘only current through the latter winding will
be that supplied from battery Ba through re
SiStOI's Z4 and Z5. This current, as already noted,
may be a 30 ma. current, and it produces a mark
which is in a spacing direction, thereby holding
ing effect on the armature of the relay. This
the armature of this relay also on its marking
increases the holding action on the armature
contact M.
“of relay SR3 to retain this armature on its mark
The upper winding of relay RR3 of repeater 10 ing contact M. When the armature of relay
RPs will also receive current in a marking di~
RR3 reaches its spacing contact S, additional
rection of greater magnitude than the current
current will be supplied to the lower winding
in the spacing direction flowing through its lower
of relay SR3 to hold the armature of relay SR3
Winding, thereby holding the armature of relay‘
on its marking contact M. This additional cur
15
RR3 on its marking contact M. The lower wind“
rent will ?ow from battery B8, through resistor
ing of relay SR3 may be considered as receiving
Z4, the upper winding of relay 3K3, the arma
opposing currents from batteries B1 and Ba. The
ture
and spacing contact S of relay RR3, the
battery B1 is connected to the lower winding of
lower Winding of relay SR3 and ground. This
relay SR3 over a circuit which includes battery
additional current, which may be of 60 ma., will
B7, resistor Z3, the coil CI-I, the armature and
be in a marking direction as already pointed out,
marking contact M of relay RR3, and the lower
so that a large resultant marking current will
winding of relay SR3 and ground. The current
from battery B7 will be a large current of,
for example,,60 ma. and it will be in a spacing
direction in the lower winding. The current
from battery Bs will flow over a circuit which in
traverse the lower winding of relay SR3.
The
armature of the relay SR3 will, therefore, be held
on its marking contact M even when the flow of
current through its upper winding will be inter
rupted as will be explained hereinafter. The ob
ject in holding the armature of relay SR3 on its
winding of relay SR3 and ground. This cur
marking contact when the key K3 at station C
rent will be of a smaller magnitude of, for ex
ample, 30 ma, and it will ?ow in the opposite 30 is opened, is to prevent a spacing signal from
being returned to station C and thereby distort
direction tending to move the armature to its
and interfere with the signals to be transmitted.
marking contact M. However, the current from
Upon the closure of contact S of relay RR3,
battery B7 will overcome that of battery B3, yield
cludes battery B8, resistor Z4, resistor Z5, the lower
ing a resultant current of about 30 ma. which is
in a spacing direction. At the same time cur
current will ?ow from battery Ba through re
ing effect of the latter current will overcome the
BK; will move to its spacing contact S.
sistor Z4 and the upper winding of relay BK3 and
this current will be in a direction which tends to
rent will be traversing the upper winding of relay
move the armature of relay BK3 to its spacing
SR3 which is connected to repeaters RP1 and RPz
contact S. This current, as'already stated, may
through the armature and marking contact M of
be of 60 ma. and it will overcome the biasing ef
relay BK3 and the equipment of telegraph sta
tion TS. The current through this upper wind 40 fect produced by the current through the lower
winding Of relay BK3 which is in a marking di
ing of relay SR3 will be a'large current of about
rection. Consequently, the armature of relay
60 ma. and in a marking direction, and the mark
As al
ready stated. the opening of the marking contact
from the batteries B1 and B8 traversing the lower .45 M of relay BKw will allow the current through
the upper winding of relay SR3 to be reduced to
winding of relay SR3. Consequently, the arma
a nullity without causing the armature of relay
ture of relay SR3 will be held on its marking con
SR3 to leave its marking contactM.
tact M.
When the armature of relay BK3 leaves its
While no signals are being transmitted over
the system and the keys of the Various stations 50 marking contact M, the current from batteries B5
spacing effect produced by the resultant current
are held closed as already stated, the lower wind
ing of relay BK: of repeater R133 will receive a
current from battery B9 which is in a marking
and Be traversing the circuit of the upper wind
ings of relays SR1 and BK1 of repeater RPi and
‘the lower windings of relays BKz and SR2 of re
peater RPz and the sounder SD10 of station TS,
direction. This current flows from battery B9,
will be interrupted. This interruption of current
through resistor Z6, the lower winding of relay
will cause the armatures of these relays just re
BKs, resistor Z7 and ground. The upper wind
ferred to, to move to their spacing contacts S.
ing of relay BKs will be devoid of current because
As the armature of relay SR1 reaches its spac
it is open-circuited at the spacing contact S of
ing contact S, the flow of current through the
the relay RR3. The dominating current through
the lower winding of relay B-K3 will, therefore, 60 upper winding of relay RR1 over line L1 to the
hold the armature of this relay on its marking
contact M.
Station C may transmit signals over line L3
winding of the sounder SDI will be reduced to a
nullity to convey a spacing signal to station A.
The armature of relay RRi will remain on its
to repeater RPa which will repeat the signals to _ marking contact Mbecause the current through
the lower winding of this relay will be reversed to
repeaters RH and RPz and the latter repeaters
a marking direction. Similarly, as the armature
in turn will repeat the signals simultaneously to
of relay SR2 reaches its spacing contact S, the
the sounders at stations A and B, respectively.
current ?owing through the upper winding of
When key K2 at station C is opened for the pur
relay RRz over line L2 to the sounder SDz will be
pose of transmitting a spacing signal, there will
be an absence of current in the upper winding of 70 reduced to a nullity to convey a spacing signal to
station E. The armature of relay RRz will also
relay RR3 so that the current in the lower wind
remain on its marking contact M. Thus sta
ing of relay RR3, which is in a spacing direction,
tions'A and B will receive a spacing signal simul
will move the armature of relay RR3 to its spac
taneously from station C in response to the open
ing contact S. As the armature of relay RR3
leaves its marking contact M and is still “in the 75 ing of key K3 at station C.
2,408,304
5
.
' ‘When the key K3 at station "c is th'e'n- closed
to transmit a marking signal tostationsA ‘and B,
the armature of relay RR3 will then be controlled
by the current in the upper winding of relay RR3
which is in a direction to‘ move the armature of
the relay to its marking contact M. When the
armature of relay RR3 leaves its spacing contact
S and is “in the air,” the current in the lower,
winding of relay SR3 will be obtained from bat
teryBs through resistors Z4 and Z5, and this cur
rent will be in a marking direction. ~This cur
rent will alone be sufficient tohold the armature
u
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6
theiarmatu're‘randbontactS of relay RRi, the
upper .windingsoff relays SR1 and 3K1,- resistor, Z1,
the upper - winding‘ of relay “ SR3, the armature
and contact M of relay BK3, key K10, the winding
of sounder SD10, resistor Z2, thelowerwindings
of relays BK2 and SR2, therarmature and contact
M of relay RR2, vbattery‘Be and'ground. As bat
teries B11 and ‘B6 are poled in mutually opposite
directions, they oppose each other and there will
be, no current in the circuit‘ just described. How~
, ever, ‘the armatures-of relays SR1 and BK1 ‘will,
be held against theirmarking contacts M due to
the reversal of current through their lower wind
ings to a markingdirection. On the other hand,
15 relays BK2 and SR2 will close their spacingconi
tacts' S upon: the decayof current through their
lower winding of relay BK3, which is in‘a 'mark
lower windings.» The‘ sounder SD10 will repeat
they received spacing signal to the telegraph sta
} ing direction, will cause the armature’ of relay
BK3 to move to its marking contact M. _Upon
the closure of themarking contact M of relay 20 The absence of current in the upper winding
BK3, ,marking' current from batteries B5 and Be
of relay SR3‘ will then allow the lower winding of
will again traverse the circuit of the upper wind
the relay SR3 to take control of the armatureof
ings of relays SR1 and BK1, the upper winding of
that relay. Under the latter conditions the spac
relay SR3, the winding of sounder SD10, andthe
ing current from battery B7 through the lower
lower windings of'relaysv BK2 and SR2. “There
winding'ofrelay SR3 will exceed the marking our
fore the armatures of relays SR1, BKI, BK2 and
rent‘from \batteryBa through ‘that winding and,
SR2 will be caused to close their marking con
hence, the armature of relay SR3 will 'be moved
tacts M. The relays SR1 and SR2 will repeat the
to its spacin'g'contact'S'. The-relay SR3‘ will then
marking signals simultaneously over lines L1 and
repeat the spacing ‘signal. over linells' to the
L2, respectively, to the sounders SD1 and SD2 at. 30 sounder SD3 of: station C.‘ The armature‘of relay
stations A and B. The’current through the up
RR3, however, will remainvon its markingcontact
‘per winding of relay SR3, however, will be, a
M While signals are'being'received from station
large current of about60' main a marking direc
A. ~ The absence of currentin the upper winding
tion and it will aid the current from batteryy'Bs
of relay BK3 vwill allowthe ‘lower winding of relay
which is traversing the lower winding of ‘relay
BK3 to retain control ofithe armature of ‘the relay
SR3 through resistors Z4 and Z5. When the
and, herice,~the-armature of. the relay BK3 will
armature of relay RR3 reaches its marking'con
remain against its'marking contactiM. ‘As the
tact M, the current from battery B7 will'again be
armature‘ of relay SR2 closes its spacing'contactS,
supplied to the lower windingof relay SR3, the
as already noted, a spacing signal'wihbegtrans
latter current being in‘ a spacing direction. Ali 40 mitted over lineLz' to sounder “SDz. 'The closure
though the resultant current in the lower wind
of contact S by the armature of relay SR2 will
ing of relay SR3 is in a spacing direction, the
not change'the position of the armature of the
current in the upper winding of relay SR3 Will be
relay RR2, the ‘armature 'remaining'iagainst it's
of greater magnitude and in a marking direction"
1contact
'When‘M.
the ,key K1 1 at station 'A is'closed-to
‘
'
and, hence, the armature of relay SR3 will be
of relay SRs'on its marking contact M. The'cur-_
rent in the upper winding of relay, BK; will be
interrupted‘by the opening of the ‘contact-S‘ of
relay RR3, whereupon the current through "the
tion
held on its marking contact M.
_
‘
‘
The coil CH is inserted in'series with the bat
tery B7 for the purpose of delayingthe spacing
current from battery Br so that this current trav
ersing the lower winding of relay SR3 will become '
effective only after the upper winding of relay
SR3 has received its marking current from bat
yteries B5 and Bo. This delay feature is impor- ,
tant, for without it the battery'Br may exert'it's
spacing effect upon the ‘lowerv winding of relay 1
SR3 to move its armature prematurely to‘ its
spacing contact. S and thereby distort the Signals
vintended to ‘be transmitted to stations A and B.
Thus signals may be transmitted from stationv C
to the repeater’ RP3 at‘ station D which then're
peats the same signals faithfully through repeat
‘ers RPl andv RP2 over lines L1_and L2 to ‘sta
TS.
.
'
'
-
I
transmita ‘marking signal, ithearrnature of relay ,
‘RRi willclose its‘marking 1 contact M, thereby
connecting battery B3 to battery B3 over the-oil"
cuit already described heretofore and hencethis
descriptionne'edinot ‘be repeated. ‘The largejcur
rent now traversingrth'e‘ lower winding of relay
SR2 will cause the-armature of the‘ relaySR2'to
close its marking contact M to ‘convey a marking
signal over line ‘L2 to the sounder S132 at station
B. Again the armature of relay RR2 ‘will become
closed ‘against its marking contact M and remain
unaffected by signals from station A. The greater
current now traversing the upperwinding of relay
SR3 will be inia marking direction'anid it ‘will
be suf?cient to- overcome’ the biasing current
through the-lowerwinding-of relay SR3 which is
poled inwa spacing direction, Consequently, the ,
tions A and B, respectively. The'sounder SD10
armature of relay SR3 will "close its contactM to
of station TS will ‘also’register the same signals.
convey a._ marking signal over line L3 tostation'
Station A ‘may also transmit signals ‘to the " F 10. ‘Againthislwillnot affect the position of: the
other stations. When key K1 is opened to trans,
“armature, of re1ay-RR3 which will remain against
mit a spacing signal-to the other stations, the V its ‘fcorltactifM unaffected by signals from station
jarmature of the receiving relay RRi at repeater
A. ' Similarly, the‘ armature of relay BK3 will re
RP1 is moved to’ its spacing contact S." When
main against ,its contact M ‘under control of‘mark
the armature of relay RRi closes its spacing con
‘ing current'through its lower winding. i Thus sta
tact S, battery B11 will be connected to battery-B3 .
to repeat the‘ spacing signal to repeaters RP2
and RP3.
The circuit connecting batteries‘ Be
tion‘j‘Ai'may emanating and spacing signals
'whiclrwill’be repeated {by relay RRl' of repeater
fRPi' to-relay SR2-of repeater R152 to convey the
and B11. may be traced from battery B11} the
‘isalne'is'i'g’nalsto station'fB.-§ In response'to‘ these
‘armature and marking contact -M' of 1 relay 3K1, @735 signals ‘the now" of current through ‘ the upper
2,408,394
7
winding of relay SR: will be changed-from a large
magnitude in a marking direction for a marking
signal to a practical nullity for :a spacing signal
so that relay SR3 may convey the same signals
to station C without operating relays RR: and
BKIl. Moreover, all of these signals will be repro
record of all signals transmitted between the vari
ous stations.
Although a station such as station C has been
joined to stations A and B by the addition of
a repeater such as RPa, other stations may be
added to the system by simply opening the cir
cuit between contacts X1 and X2 and inserting
duced by sounder SD10 at .station TS.
a repeater such as RP3 therebetween. A num
When the operator at station A wishes to break
ber of repeaters such as RPs may ‘be added in se
transmission from any of the other stations he
ries between points X1 and X2 so that each such
will open his key K1. In that event the armature 10 repeater will repeat signals in both directions be
of relay ‘RRi will close its spacing contact S pro
tween the stations associated with these addi
vided relay SR1 has ‘its armature on its contact
tional repeaters and all or the other stations of
M. Then ‘batteries B11 and Be will be connected
the system.
'
to each other over the circuit including the upper
A single telegraph station such as TS has been
windings of relays SR1 and BKr, the upper wind 15 shown inserted between repeaters RP2 and RP3
ing .of relay SR3, the equipment at station TS,
for illustrative purposes. If desired an addi
and the lower windings of relays BKz and SR2.
tional number of such telegraph loops may be
The armature of relay BKI will ‘hold its marking
included in series with each other in the cir
contact M closed due to the reversal of current
cuit to repeat the same signals to each of such
in its lower winding. Also the armature of relay
additional stations.
BKa will close its spacing contact S, and relay
The magnitude of the currents referred to here
SR2 will also close its spacing contact "S. The
ina'bove have been cited merely to aid in under
armature of relay RRi will therefore be connected
standing the principles of the invention. Cur
either to battery Be or to battery B14, both of which
rents of other magnitudes may be used in the
are poled positively so that the, receiving party 25 practice of the invention, as will be apparent to
will receive only positive voltage from repeater
those skilled in the art.
RPz. This will effectively break transmission.
While the invention has been disclosed in cer
When the operator at station B wishes to break
tain particular embodiments merely for illus
transmission from any other station, he will like
trative purposes, it will be understood that this
wise open his key K2. In that case the armature 30 invention may be applied to other and widely
of relay RR2 will be connected to batteries B11
varied organizations without departing from the
and 136, both of which are also poled in a posi
spiritof the invention as de?ned in the following
tive direction, thereby likewise breaking trans
claims.
mission. Similarly the relay SR: will cause its
What is claimed is:
armature to close its spacing contact S in response 2 .
1. In a telegraph repeating system for repeat
to the opening of the keys at stations A or B to
ing
signals from any one of three lines to the
interrupt transmission from' station C. When
other lines simultaneously, the combination of
the operator at station C wishes to break trans
two repeaters each having a line terminal and a
mission, his opening of key K3 will cause the
armature of relay RR; to open its marking con 40 loop terminal, a third repeater having a line ter
minal, a ?rst relay and a second relay constitut
tact M, whereupon the armature of relay B-Ka
ing the loop of said third repeater, the line ter
will close its contact S to break the circuit be
minal of each repeater being connected to one of
tween the upper windings of relays SR1‘ and BK'].
said lines, the loop terminals of said two repeat
and the lower windings of relays BKz and SR2.
This circuit will remain open as long as the key
IQ at station C is open. Hence the operators at
stations A and B will be apprised of the breaking
signal.
It will be observed that the three outlying sta
tions A, B and C are joined together at the re
peater point D. The repeater point D has three
repeaters RP1, RPz and RP3 which are associated
with the respective stations A, B and C. The
line terminals of the three repeaters are con
nected to their associated stations A, B and C by
lines Ll, L2 and L3, respectively. The loops of re
peaters RP1 and RPz are connected in series with
the upper winding of relay SR3 and, the armature
and contact M of relay BKa which may be treated
ers being connected in series with each other in
a series circuit which includes the winding of
the ?rst relay of said third repeater and the ar
mature and contact of the second relay of said
third repeater, and means whereby said third re
peater will send oppositely poled currents over
the line associated with said third repeater to
repeat signals thereto vfrom either of the other
repeaters.
2. In a telegraph system, the combination of
three lines, means for repeating signals from any
one of said lines simultaneously to the other lines,
said means comprising two repeaters each having
a line terminal and a loop terminal, a third re
peater having a line terminal and a loop, the loop
of said third repeater including a ?rst relay and
as the loop of repeater RPs. The relay SR3 re
a second relay, the line terminal of each repeater
peats signals from repeaters RPi‘and RPz associ
being connected to one of said lines, the loop ter
ated with stations A and B to station C while
minals of said two repeaters being connected in
relay BKa repeats signals from station C to re
a series circuit which includes the winding of
peaters RH and RPz and thence to stations A 65 said ?rst relay and the armature and contact of
said second relay of said loop, and means where
and B, respectively. Only three repeaters are re-'
quired at the repeater point D for the repeater
system interconnecting the three stations A, B
by said third repeater will sendoppositely poled
and C.
currents over the line associated with said third
repeater to repeat signals thereto from either of
the other repeaters.
.station TS are shown to include equipment for
Morse signaling, it will be apparent that the
equivalent at these stations may be of the tele
?rst, second and third telegraph sets, ?rst, second
Although the stations A, B and C and the loop
typewriter type.
Teletypewriter equipment at
these stations will, of course, make a permanent
3. In a telegraph system, the combination of
and third repeaters associated respectively with
said sets, each repeater including a line termi
nal and a loop, each of the line terminals of said
2,408,304
9
repeaters being connected to one of said sets,
the loo-p of said third repeater having a ?rst re- '
a
10
in a series circuit which includes the loop of the
latter repeater, and means whereby said third
‘lay for repeating signals from either of the other
repeaters to the telegraph set associated with said
third repeater and a second relay for repeating
repeater will send oppositely poled currents over
the line associated with said third repeater to re
signals from the telegraph set associated with said
third repeater to the repeaters associated with the
peaters.
peat signals thereto from either of the other re
5. A repeater station comprising three tele
graph repeaters for three telegraph sets located
other telegraph sets, the loops of said ?rst and
second repeaters being connected in series with
at different remote points, each repeater hav
each other in a series circuit which includes the in ing a line terminal and a loop, the line termi
winding of said ?rst relay and the armature and
nal of each repeater being connected to one of
said telegraph sets,,a telegraph loop circuit hav
contact of said second relay of the loop of said
third repeater, and means whereby said third re
ing a key and a sounder, the loops of all of said
peater will send oppositely poled currents over
repeaters being connected in a series circuit which
the line associated with said third repeater to re
includes said telegraph loop circuit, one oflsaid
repeaters having ?rst and second relays arranged
peat signals thereto from either of the other re
peaters.
so that the winding of said ?rst relay and the
4. A repeater station comprising three tele
armature and contact of said second relay are
graph repeaters for three telegraph sets located
connected in series with each other to constitute
at different remote points, each repeater having ' the loop of said repeater, and means whereby said
third repeater will send oppositely poled cur
a line terminal and a loop, the line terminal of
each repeater being connected to one of said tele
rents over they line associated with said third re
graph sets, the loops of all of said repeatersloe
peater to repeat signals thereto from either of
the other repeaters.
ing connected in a common series circuit, one of
said repeaters including ?rst and second relays, 25
the winding of the ?rst relay and the armature
and contact of the second relay being connected
‘
FRANK HOMER FAY.
ELMER. WILLIAM REEVE.
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