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Патент USA US2406834

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- Sept. 3, 1946.
_
ca. :2. HARTLEY ET AL
2,406,834
ARRANGEMENT FOR RECEIVING PREDETERMINED TRAINS OF ELECTRIC IMPULSES
Filed_ May 28 , 1943
3 Sheets-Sheet 1
FIG. 3A
INVENTORS
GEORGE CLIFFORD HARTLEY
LEONARD POWELL LOWRY
FREDRICK HARRY BRAY
323.4%’
ATTORNEY
'
'
Sept. 3, 1946.
G. c. HARTLEY ET AL.
' 2,406,834
ARRANGEMENT FOR RECEIVING PREDETERMINED TRAINS OF ELECTRIC IMPULSES
Filed May 28, ‘1945
hp
34
TA
TB
SC
Tc'
M
GA
RA
RB
3 Sheets-Sheet 2
Sept. 351946.
a, c, HARTLEY E1- AL
2,406,834
ARRANGEMENT FOR RECEIVING PREDETERMINED TRAINS OF ELECTRIC IMPULSES
Filed May 28, 1943
:5 Sheets-Sheet s
INVENTORS
GEORGE CLIFFORD HARTLEY
LEONARD POWELL LOWRY
IFZEIDRICK HARRY BRAY
ATTORNEY
Patented Sept. 3, 1946
2,405,834
UNITED STATES PATENT OFFICE
2,406,834
ARRANGEMENT FOR RECEIVING PREDE
TERMINED TRAINS OF ELECTRIC IM
PULSES
George Cli?‘ord Hartley, Leonard Powell Lowry,
and Frederick Harry Bray, London, England,
assignors to Standard Telephones and Cables
Limited, London, England, a British company
Application May 28, 1943, Serial No. 488,868
In Great Britain June 4, 1942
12 Claims.
(Cl. 177-353)
2
1
This invention relates to a device for peri
odically opening and closing an electric circuit.
An object of the invention is to provide such
a device the periodicity of which is independent
of ?uctuations of the supply.
According to the invention a device for period
ically opening and closing an electric circuit com
prises a polarised relay having two opposed wind
ings, means for passing current through one
winding, means for passing the charging current It)
of a condenser through the other winding, con
tacts controlled directly or indirectly by the relay
to change the direction of current through the
one winding and to start the discharge of a con
is normally ?owing from battery B through a
potentiometer PR to ground. Current also flows
from a point on the potentiometer, through
winding I of relay P, back contacts ppI, back
contacts stI, ground. This current is adjusted
to be suf?cient to keep the armature of relay P
against its spacing contact S, in which position
relay PP is de-energised. Contacts $752 back,
keep a condenser C short circuited through a
resistance Rs.
When it is desired to start the periodic oper
ation of relay P, relay contacts stI change over
and contacts stZ open, due to operation of relay
ST. Current then flows from battery B through
resistance R4, front contacts stI, back contact-s
denser through the other winding, and contacts
controlled directly or indirectly by the relay for
ppl, winding I of relay P, point 'on potentiom
opening and closing said circuit.
eter PR, ground. This current tends to move the
Preferably adjustable resistances are provided
armature of relay P to its marking contact, but
associated with the relay windings for adjusting
the effect is opposed by that of a charging cur
the period of a complete make and break of the 20 rent for condenser C ?owing through resistances
circuit being controlled and the ratio between
R4 and R3, winding 2 of relay P.
make and break.
Curve A in Fig. 2 shows the variation of the
The invention also comprises the use of a de
vice as set out above in selective apparatus
current in winding I with time, and curve B the
variation of current in winding 2 with time.
adapted to respond to signals consisting of a 25 The line cIcI represents the current necessary
sequence of marks and intervening spaces of pre
to operate the armature of relay P to its marking
scribed duration. One of such devices supplies
contact. As the currents in the two windings
impulses to a relay counting chain for measuring
are opposed, this operation of the armature does
the duration of the marks, another supplies im
not take place until time tI when the difference
pulses to a second relay counting chain for 30 has become equal to ccI.
measuring the duration of said spaces. Means
When relay P closes its marking contact M,
controlled by the relay counting chains returns
relay PP is operated and contacts ppI change
the apparatus to zero upon the occurrence of a
over. The current in winding I of relay P
changes direction, ?owing now from a point on
mark or space of other than prescribed duration,
and means controlled by the relay counting
chains closes a circuit upon the occurrence of the
correct sequence of marks and spaces.
The invention will be better understood from
the following description taken in conjunction
with the accompanying drawings, in which:
Fig. 1 shows a circuit and the parts connected
therein which form the device according to the
invention;
potentiometer PR through winding I of relay
P, contacts ppl to ground. This current tends
to move the armature of relay P to its spacing
contact.
The condenser C commences to dis
charge through winding 2 of relay P and the
discharge current opposes the current in winding
I. The armature of relay P is thus not operated
to its spacing contact until time t2.
Any variation of voltage of battery B will affect
Fig. 2 shows curves for explaining the oper
the current in each winding in the same man
45 ner, either on operation of marking or spacing
ation of Fig. 1;
Figs. 3A and 3B taken together show the circuit
contacts, so that such variation does not affect
of a radio distress signal receiver, responding to
either the overall period of operation of relay
a distress signal to give an alarm but not so
P nor the ratio between the periods of closure
reponding to other signals;
of marking and spacing contacts.
Contacts of relay PP (not shown) may be
Fig. 4 is a timing diagram for certain relays
of Fig. 3.
Referring to Fig. 1 of the drawings, the circuit
shown is adapted to remain in the condition
shown until a relay ST is operated. Relay P
is a polarized relay with two windings. Current
used to open and close a circuit.
The point at which winding I of relay P is con
nected to potentiometer PR, and the values of
resistances R3, R4 and the capacity of con
denser C may be altered in order to alter the
2,406,834
a)
a
4
.
overall period of relay P and the ratio between
key KSI.
Before relay SR operates current
the periods of opening and closing of a circuit
flows from a point between resistances RI and
by contacts of relay PP.
R2 through winding I of relay P, prl back, stI
The device above described may be used to
back, ground. When relay ST hasoperated, cur
produce makes and breaks of an electric circuit
rent ?ows from 120V battery, stl front, prl back,
(impulses) for any purpose for which exact tim
Winding I of relay P, resistance R2, key KSI,
ing is important. In particular it is shown in‘
ground. Charging current for condenser CI
Figures 3A and 313 as applied to a radio distress
?ows over stI front, prl back, resistance R3,
signal receiver. A marine distress signal consists
winding 2 of relay P, condenser CI, key KSI,
of a series of three dashes each of four seconds 10 ground. For production of impulses of the de
in length separated by spaces of one second du~
sired period, viz: 580 milliseconds with about
ration. A certain tolerance in the length of
50% ratio relay P is a telegraph relay of the kind
dashes and spaces is allowed in distress signal
described in British speci?cation No. 491,893,
receivers and a dash is accepted as of correct
length if between 3.5 seconds and 4.5 seconds
duration, whilst a space is accepted as correct if
condenser CI is 10 microfarads, RI is 60,000
ohms, R3 is 30,000 ohms, whilst R2 is adjustable
between 25,000 and 30,000 ohms.
it exceeds 1/5 second approximately and does not
After an interval relay P closes its marking
contact and operates a helping relay PP which
In the circuit shown in Figures 3A and 3B, rc
at contacts pp! operates a second helping relay
lays P and PA are used, the circuits of which give 20 PR. At contacts ml 'the current in winding I of
an impulse time (make or break) of approxi
relay P is reversed and the condenser charging
mately 580 milliseconds with makes and breaks
circuit broken. At contacts 2on2 relay SA is op
equal. The following four batteries shown by the
erated from battery winding 2 of SA, ta2 ‘back,
conventional symbols of thick and thin lines are
29292 front, 3153 front, ground.
120 volts; in Figure 3A the ‘battery attached be
The counting relays SA, TA, SB, TB, SC, TC
tween ground and the terminal ST2, in Figure
are operated and released by the closing and
3B‘the one attached between the resistor RI and
opening of contacts 17192, as determined by the
ground, in the same ?gure the one attached be
closing and opening of the marking contact pl,
tween R5 and ground, and in the same ?gure the
in a sequence which is used to time the period
exceed 1% seconds.
one attached between the terminal PFZ and
ground. These are used to feed the circuits of
the polarized relays P and PA. The other bat
teries alsorshown by the same conventional sy1r~
bols of thick and thin lines are 24 volts.
The terminal marked RC is connected to a
suchrelay manner
in‘ the output
that when
circuit
a relay
of a in
radio
the receiver
latter cir~
of a dash.
The circuit for these counting ree
lays is dependent upon contacts st3 being closed;
when these contacts open all the said counting
relays are released. The sequence of operation
of the counting relays can be seen from Fig. 4.
Horizontal lines indicate the periods during
which the respective relays are operated.
When relay P opens its marking contacts, re
lay PP releases followed by PR. During, a very
brief interval whilst back contact-s p204 areclosed
cuit responds to a dash battery is applied to ter
minal RC to operate relays R and HR whilst
during'a space the battery is removed. On re 40 and before front contacts p12 are opened a short
ceipt of a correct distress signal, the circuit shown
circuit of. condenser Cl' exists to drain off any re
sidual charge therefrom.
applies
audible alarm.
ground to terminal. AA to operate
The circuit is not in use until a locking key
KSI is operated.
When relay PP releases, relay TA operates in
series with winding I of relay SA, the circuit be
45 ing completed over sa2 front, @1102 back. A non
inductive shunt around winding 2 of relay SA
lay ST. When a dash is received and battery is
ensures that contacts saZ remain closed during
applied to terminal RC a circuit is completed for
possible vibration of contacts 1119?. SA remains
relays R and HR over to! back, saI back, tbI
operated. Relay TA completes, at contacts tat-l
back, sbl back, tel back, scI back, stll' back,
front a circuit for Winding I of relay SB, which
ground. Relay‘ HR is a high speed relay and
relay operates.
closes a locking circuit of R and HR to ground
When relay PP again operates av circuit for
over hrI. R is a slow operating relay, having
relay TA is completed, independently of relay
one winding shunted ‘by its own back contacts.
SA, over 25112 front and p102 front and relay TA
These relays are so arranged that relay HR re
remains operated but relay SA releases. Relay
leases within 1 millisecond if battery is removed
SB remains operated.
‘from terminal RC, whilst relay R being slow to
When relay PP releases for the second time
operate is not energised due to accidental signals.
relay TA is released and relay TB is operated
Relay R when. energised removes the short cir
in series with winding I of relay SB. Relay SC
cuit from its second winding and becomes fast 60 operates over winding 2 and tbl front.
to release.
When relay PP operates. for the third. time,
At contacts r2 a. circuit is closed for relay ST
relay SA again operates and the above described
from battery, r2 front, winding of ST, n2 back
sequence of operation and release of relays SA
andLI back in parallel, key KSE, ground. When
and TA continues to occur in subsequent periods.
ST operates, contacts sti change over the circuit
The pairs of relays SB and TB and vSC and TC
for winding I of relay P, contacts st2 remove a
operate and release similarly to relays SA and
short circuit from condenser CI in the circuit of
TA, their cycles of operation depending upon
winding 2 of relay P, contacts std prepare a circuit for counting relays TA, etc., and contacts
cont-acts of TA and TB respectively instead of
upon contacts of PP.
st4 open the circuit of R and HR which, how
ever, remains closed at hrI front until the sig
It will be seen from Fig. 4 that the periods of
,nal comes to an end.
operation and release of relays SA and TA are
twice those of relay PP and in consequence the
in The
Fig. circuit
1.. Current
of relay
flows
P from
is likethe
that
120ofvolt
relay
bat~
The key KSI prepares a circuit for a start re
periods of operation and release of relays SB and
tery over resistances RI and R2 to ground on 75 TB are twice those of relay TA‘ and the periods
2,406,834.
6
5
When PZ ?rst operated, a circuit was completed
of operation and release of SC and TC twice
those of TA.
for relay L, battery, winding 2 of relay L, m2
back p24 front p23 front, key KS, ground. Re
'
After relay PP has released after its sixth
operation, i. e., after a period of approximately
3.5 seconds, relays SB, TB and TC are all oper
ated and relay D operates over tc3 front, .9112
front, tb2 front, st3 front, ground, and locks over
113 front, st3 front to ground. Relay D prepares
a circuit for relay PZ over pzl back, all front,
in series with ST, but remains short circuited
whilst relay R is operated.
lay L prepares a circuit for relay M and when
PZ releases, relay M operates in series with wind
ing l of relay L, 23 front, p24 back, st2 front, key
KS, ground. If relay PZ releases before ST oper
ates, however, this circuit is not completed and
relay L releases.
Relays L and M operated together therefore
record the conclusion of a correct pause period
If the dash ceases after the termination of
the sixth operation of PP (and before the end
of a certain limiting period as explained here
immediately after the ?rst correct dash period.
Relay ST restores the circuits of relay P and
after), relay PZ operates in series with relay ST.
number of these impulses being counted by the
relay PP commences impulsing as before, the
Relay PZ closes a locking circuit for itself over
counting relays SA etc. in the same manner as
pzl front, qal back, ral back and rbl front in
parallel, keys KS, ground and breaks the circuit
before.
Relay DD looks over dd2 front to st?» front and
ground. Thus whilst the dash continues further
relay PZ cannot operate. If then the dash ceases
after 4.5 seconds, relay ST releases, its circuit
being broken at contacts 12 and the whole of
the circuits return to normal condition.
Relay P2 is the relay, the energisation of which
operation, a circuit is completed for relay M in
dependently of relay L over m2 front, p24 front,
It should be noted that PZ is not im
mediately released upon the operation of relay
ST, but that relays PA and PT go on impulsing
for ST which releases.
If the received dash lasts longer than the 20 and after these impulses PZ is released in time
for its re-operation when required on a dash ex
eighth period of operation of PP, i. e., longer
ceeding 3.5 seconds. Then in the same manner
than 4.5 seconds approximately, relay DD oper
as above described relay PZ operates if the sec
ates over (12 front, tc2 back, fbZ back, st3 front,
ond dash‘ period is of correct length. On this
ground and breaks the operating circuit for P2.
p23 front, KS, ground. Relay L releases. Relay
N then operates over Z2 back, ml front, p.23 front,
KS, ground; and locks over 11.3 front and the
same circuit.
If relay PZ is prevented from operating because
the dash lasts too long, the circuit for relays M
and L in series over 11024 back, and s't2 front is
broken when ST releases at the end of the dash
period and relays M and L are released. The op
eration of relay N is thus a record that a second
dash of correct duration has been received.
When PZ operates relays PA and PT begin im
indicates that a dash of correct duration has been
received.
After the release of ST and the return to nor
mal of the counting relays SA, etc, a circuit is
again completed from ground over std back, so!
back, tcl back, sbl back, tbl back, sal back, tal
back for relays R and HR to respond to any
further dash. Any short signals received, clue to
atmospherics, in the pause ‘between dashes, are
pulsing as before to time the pause period, If
ST re-operates before the pause has lasted long
enough to release PZ the locking circuit for relay
N goes over 113 front, st2 front, key KS, ground.
If, however, the pause lasts too long, so that PZ
is released before relay ST operates the locking
‘unlikely to operate relay ST.
The pause between dashes must now be meas
ured and the end Of the phase is signalled by
the re~operation of relay ST and the end of a
pause of correct duration by the re-operation of
relay ST whilst relay P2 is still operated. The
circuit of relay N is broken and that circuit re
leases.
The re-operation of ST starts relays P and PP
minimum period allowed for a correct pause is
impulsing to time the third dash. If this third
the period within which PZ operates, ST releases,
the counting relays SA, TA, etc, release and relay
ST re-operates completely. The maximum time
dash is of correct length, PZ re-operates and re
lay L operates over m2 back and its original cir
cuit. A circuit is now closed for relay N over Z2
‘allowed for a correct pause is 1.5 seconds ap
front, 122 front, key KS, ground. Relay L is also
held operated either over 1122 back, p24 front,
proximately and is timed by the response of
counting relays QA, RA, QB and RB, to impulses
produced by relay PA the circuits of which are
or in series with M over 13 front and 1124 back,
arranged in the same manner as those of relay
P. Contacts p22, on changing over change over
LA Q21 n3 front and the same locking circuit as relay N.
the circuits of relay PA and contacts p.25 pre
pare circuits for counting relays QA, RA, QB
and RB.
After an interval relay PA closes its marking
contacts pal, and operates relay PT. Front con
tacts p752 complete a circuit for relay QA over
winding 2. Relays QA, RA, QB and RB operate
and release in the same manner and at the same
intervals as relays SA, TA, SB and TB and their
sequence of operations is shown in the lower part
of Fig. 4. At the end of the third operation of
relay PT, relays QA, RA and RB are all in oper
ated condition and the circuit of PZ is broken
at contacts qal, ml and Th! in parallel and PZ
releases. Release of P2 stops the operation of
relay PA and also releases the counting relays
QA, RA, QB and RB so that the circuit is in
the same condition as before the receipt of any
signals.
'
Ground from key KS is extended over ll front,
n! front to terminal AA to give an audible alarm.
The periods of pulsation of relays P and PA
may be set to the correct value by adjustment of
resistances R2 R6. In order to provide for a
check of the periods of these relays test keys
KT! and KT2 are provided. Key KT2 when
operated causes the operation of relay R, fol
V lowed by that of ST and the pulsing of relays P
and PP. Key KTI when operated causes the op
eration of relay PZ and the consequent pulsing
of relays PA and PT. The impulses of contacts
plp3 or ‘p133 operate a counting meter CM when
key KT3 or KT4 is closed. The adjustment re
quired is such that for relays P and PP the meter
should be operated between 102 and 105 times a
minute, whilst for relays PA and PT the meter
should be operated between 120 and 124 times a
75 minute.
2,406,834.
7
8
What is claimed is:
1. In an automatic signaling system, alpolar
comprising. capacitance'means, means for supply
ized relay having an armature electromagnet
ically controlled by two‘ opposite windings each
establishing any one of two switching positions
in accordance with current polarity, a ?rst cir
cuit, means connected to one. of said, windings,
means for supplying current. to said ?rst circuit
means, a second circuit means connected to the
second of said windings and comprising capaci
tance means, meansfor supplying current to said
second circuit means to cause charging of said
capacitance means, a ?rst switching means con
ing current to said second circuit means to cause
charging. of, saidv capacitance means, a ?rst
switching means-controlled by said relay for re
versing the direction of current in said ?rst cir
cuit means and for discharging said capacitance
means in saidsecondcircuitmeans, and a second
switching means controlled by said relay to open
and close periodically in accordance with the
10 charging and. discharging. of said capacitance
means.
5. A, system according to claim 1, comprising
means for maintaining said capacitance means
trolled. by said relay for reversing the direction
ina steady state and, maintaining a holding cur
of- current in said ?rst circuit means and for dis 15 rent through the winding, of therelay not con.
charging said capacitance means in said second
nected to said capacitance-means, to render: the
circuit means, anda second switching means con
system inoperative.
trolledibysaid. relay to open and close periodically
in accordance with the charging and discharg
ing of said capacitance means.
one winding is connected to a point on, said po
2. In an automatic signaling system, a polar
ized, relay having an armature electromagnet
ically controlled by twoiopposite windings each
establishing any one of two switching positions
in accordance with current polarity, a ?rst cir
cuit means connected to one of said windings,
means for supplying current to said ?rst circuit
means, a second circuit means connected to the
6. A system according to claim 4, in which said
tentiometer whereby the current in said: winding
is. adjustable to vary at least one of the following
characteristics: the, ratio, between the time of
operation and release of saidpolarized relay, and
the complete period of operation and release.
7. A system according to claim 1, comprising
second of said windings and comprising capaci
means for operating said first and second circuit
means in accordance Withllllé duration oila signal
received, a series of counting relayslsuccessively
operated by a number of successive timing im
tance means, means for supplying current to said
second circuit means to cause charging of said
capacitance means, a ?rst switching means con
pulses produced by said secondswitching. means
for the duration of saidsignal, relay means for
evaluating a signal of. predetermined duration,
trolled by said relay for reversing the direction
or current in said ?rst circuit means and for dis
and circuit means for energizing said relay means,
including preparing contacts. and operating con
charging said capacitance in said second circuit
tacts, said preparing contacts being operated by
means, a second switching means controlled by
a counting relay corresponding to the passage of
said relay to open and close periodically in ac
a predetermined number of timing impulses, and
cordance with the charging and discharging of
said operating contacts being operated by the
said, capacitance means, and a third switching
ceasing of, the signal producing said timing im
means for selectively maintaining said capaci 40 pulses.
tance means in a steady state while maintaining
8. A system according to claim 1, comprising
a holding current through the winding not con
means for operating said. ?rst and second circuit
nected with said capacitance means.
means in accordance with the duration of a signal
3. In an automatic signaling system, a polar
received, a series of counting relays successively
ized. relay having an armature electromagnet~ r operated by a number of successive timing im
ically controlled by two opposite windings each
establishing any one of two switching positions in
accordance with current polarity, a ?rst circuit
means connected to one of said windings, means
for supplying current to said ?rst circuit means,
means for adjusting the current of said winding
to vary operation and release times of said relay,
pulses produced by said second switching means
for the duration of said signal, relay means for
evaluating a signal of predetermined‘ duration,
circuit means for operating said relay means,
of said windings and comprising capacitance
including preparing contacts and operating con
tacts, said preparing contacts. being operated by
a counting relay corresponding to the passage
of a predetermined number of timing impulses,
and said operating contacts being operated by
means, means for supplying current to said sec
ond circuit to cause charging of said capacitance
means, a ?rst switching means controlled by said
r the ceasing of the signal producing said timing
impulses, and further relay means operated by
a counting relay after the passage of a predeter
a second circuit means connected to the second
relay for reversing the direction of current in
mined number of? timing impulses greater than
said ?rst circuit means and for discharging said
the foregoing one, and for restoring the polarized
capacitance means in said second circuit means, 60 relay into the same state as before the reception
and a second switching means controlled by said
of a signal.
relay to open and close periodically in accordance
9. A system according to claim 1, comprising
with the charging and discharging of said capaci
means for operating said ?rst and second circuit
tance means.
means in accordance with the duration of a signal
4. In an automatic signaling system, a polar 65 received, a series of counting relays successively
ized relay having an armature electromagnet
operated by a number of successive timing im
ically controlled by two opposite windings each
pulses produced by said second switching means
establishing any one of two switching positions
for the duration of said signal, relay means for
in accordance with current polarity, a ?rst circuit
evaluating a signal varying in duration between
means connected to one of said windings, means 70 predetermined limits, further circuit means for
for supplying current to said ?rst circuit means,
operating said relay means, said further circuit
means comprising a potentiometer for adjusting
means including preparing contacts and operat
the‘current of said winding to vary. operationand
ing contacts, said preparing contacts being oper
release’ timesiof said relay, a second circuit means
ated by a counting relay corresponding to the
connected to the second of said windings. and 75 passage of a predetermined number of timing
2,406,834
impulses, and said operating contacts being oper
ated by the ceasing of the signal producing said
timing impulses, and further relay means oper
ated by a counting relay corresponding to the
passage of a predetermined number of timing
impulses greater than the foregoing one, for re
storing the polarized relay into the same state
as before the reception of the signal, the differ
ence between the ?rst and second numbers of
timing impulses being two timing impulses and
equal to the tolerance permissible for the dura
ion of a signal.
10
ing capacitance means, said circuit means being
controlled by a pause received succeeding said
normal duration dash, further switching means
controlled by said second polarized relay to open
and close periodically in accordance with the
charging and discharging of the capacitance
means of said second polarized relay, a series of
counting relays successively operated by a num
ber of successive timing pulses produced by said
further switching means for the duration of said
pause, relay means for evaluating a pause of pre
determined duration, further circuit means for
operating said relay means, said further circuit
means including preparing contacts and operat
10. In an automatic signal system according to
claim 1, comprising a second polarized relay hav
ing an armature electromagnetically controlled 15 ing contacts, said preparing contacts being oper
by two opposite windings and establishing any
ated by a counting relay corresponding to the
one of two switching positions in accordance with
passage of a predetermined number of timing
current polarity, relay means operating said sec
impulses, and said operating contacts being op
ond polarized relay and controlled by the second
erated by the ceasing of the pause producing said
switching means of the ?rst polarized relay in 20 timing impulses, and further relay means oper
response to a normal duration dash signal con
, ated by a counting relay after the passage of a
trolling its first and second circuit means, said
predetermined number of timing impulses
second polarized relay having ?rst and second
greater than the foregoing one, and for restoring
circuit means connected to its two windings,
the polarized relay into the same state as before
respectively, one of said circuit means comprising
the reception of a signal.
capacitance means, said circuit means being con
12. In an automatic signal system according to
trolled by a pause received succeeding said nor
claim 1, comprising a second polarized relay hav
mal duration dash, further switching means con
ing an armature electromagnetically controlled
trolled by said second polarized relay to open
by two opposite windings and establishing any
and close periodically in accordance with the 30 one of two switching positions in accordance with
charging and discharging of the capacitance
current polarity, ?rst relay means operating said
means of said second polarized relay, a series of
second polarized relay and controlled by the sec
counting relays successively operated by a number
ond switching means of the ?rst polarized relay
of successive timing pulses produced by said fur
in response to a normal duration dash signal
ther switching means for the duration of said
controlling its ?rst and second circuit means,
pause, relay means for evaluating a pause of pre
said second polarized relay having ?rst and sec
determined duration, and further circuit means
one circuit means connected to its two windings,
for energizing said relay means, said further cir
respectively, one of said circuit means compris
cuit means including preparing contacts and
ing capacitance means, said circuit means being
operating contacts, said preparing contacts being 40 controlled by a pause received succeeding said
operated by a counting relay corresponding to
normal duration dash, further switching means
the passage of a predetermined number of timing
controlled by said second polarized relay to open
impulses, and said operating contacts being oper
and close periodically in accordance with the
ated by the ceasing of the pause producing said
charging and discharging of the capacitance
timing impulses.
11. In an automatic signal system according to
claim 1, comprising a second polarized relay hav
ing an armature electromagnetically controlled
by two opposite windings and establishing any
*- means of said second polarized relay, second
relay means controlled by said further switching
means in response to a normal duration pause,
said ?rst and second relay means including
counting relays for registering the number of
one of two switching positions in accordance EU succeeding ‘dashes and dots of correct duration,
and alarm means controlled by at least one
of said counting relays in response to the regis
tration of a predetermined number of correct
in response to a normal duration dash signal
dashes separated by correct dots.
controlling its first and. second circuit means, :
said second polarized relay having ?rst and sec
GEORGE CLIFFORD HARTLEY.
ond circuit means connected to its two windings,
LEONARD POWELL LOWRY.
respectively, one of said circuit means compris
FREDERICK HARRY BRAY.
with current polarity, relay means operating said
second polarized relay and controlled by the sec
ond switching means of the ?rst polarized relay
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