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0a. 22, 1946.
2,409,720
w. P. PLACE ETAL
SELECTIVE CONTROL AND INDICATION SYSTEM
Filed Nov. 4, 1943
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4 Sheets-Sheet 1
Oct. 22, 1946.
.Filéd Nov. 4, 1943
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2,409,720
w. P. PLACE EI'AL
SELECTIVE 001mm. m nwicmlon SYSTEM
4 Sheets-Sheet _2
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INVENTORS
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0a. 22, 1946.
w. P. PLACE ET AL.
2,409,720
SELECTIVE CONTROL AND INDICATION SYSTEM
Filed Nov. 4, 1943
4 Sheets-Sheet 3
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INVENTORS’
wz'ZZardRPlaee and
BYA/
THEIR ATTORNEY
Get- 22, 1946-
2,409,720
w. P. PLACE ETAL
SELECTIVE CONTROL AND INDICATION SYSTEM
Filed Nov. 4, 1943 '
4 Sheets-Sheet ‘4
INVENTORS
7mm
TTORNEY
’
Patented ‘Oct. 22, 1946
2,69,?26
UNITED STATES PATENT OFFICE
2,409,720
SELECTIVE CONTROL AND'INDICATION
SYSTEM
‘Willard 7P. ‘Place, .Penn Township, Allegheny
County,'and Alfred B. Miller, Edgewood, Pa.,
assignors to The Union'Switeh & Signal Com
‘pany, Swissvalc, Pa., a corporation of Pennsyl
vania
Application November 4, 1943, Serial No. 508,948
13 Claims. (01. 177-353)
2
each such device beingtprovided-with an ‘electric
Our invention relatesto selective control. and
equipment that responds to a preselected ar
indication systems, and more particularly to ap
rangement of the currents thus supplied to the
paratus' for suchsystems using diiierent combi
line circuit. Preferably ,an office battery and
nations of currents of different characteristics.
An electric equipment or device is frequently 5 a commercial source of' alternating current, such
as a 60 cycle current; are‘ connected to the line
controlled and indicated througha singleline
circuit to, power certain portions of the-equip
circuit by using an alternatinglcurrent of one
ment of each of the devices. Indication oscilla
frequency‘ for ‘control and. a di?erent alternating
current of a different frequency for indication.
In this way a plurality of devices can be con
tors and control oscillators; together-with. an op
trolled and indicated selectively through-a single
currents, control currents and an operating-cur
line‘ circuit. The selectivity isrmore accuratev and
also more reliable byiusing different combinations
of alternating currents of different‘ frequencies.
thereto an indication oscillator and a control os
In such'systems simplicity of apparatus; freedom
from ‘operation by shock excitation and foreign
current, and the resetting and testing of the
spective device. "The operating oscillator sup
erating oscillator at the ;;o?ice supply-indication
rent, respectively. "Each device has assigned
cillator Which supply currents of’ different'fre
quencies preselected to be;individua1 for the re
plies current at a frequency different from; that
of the other-oscillators, but the operating; oscil
apparatus are essential features.
Accordingly, a feature of our invention is ‘the
‘provision in selective control and indication sys
tems of novel and improved apparatusforindi
eating diiierent conditions of' anielectric. equip
ment and for controlling the operation .ofvsuch
equipment.
Another feature'of ourinvention is the-pro
vision of apparatus of the type here involved in
corporating novel means for automatically. indi
lator is commonto the group of devices.
20 ‘Each-indication oscillator is normally active
and is connectedacross the line circuit through
a ?lter tuned to create a resonant conditionwith
respect tolthe oscillator and the distributed ca
pacitance of the line circuit, so that each indi
25 cation oscillatortnormally supplies a line charg
ing current which ‘is of. a relatively large prese
eating ‘an 'abnorm‘al‘condition-l at a device ‘and for
subsequently resetting the. apparatus.
Again, a feature of our invention is the provi
sion ‘of-apparatuslof the type? here’ contemplated
lected value andwhich current can be used as
an indication current. .Indication receivers. are
provided at the oi?ce, one for each device, and
each such receiver is coupled to the .o?ice ?lter
interposed in the connection of the indication
oscillator for the same device and the receiver is
incorporating novel means to. control the :oper
ation' of a‘ device and wherewiththe probability
of operation due to shock excitation and .foreign
energy is minimized.
A speci?c feature of- our invention is the pro
vision in a selective controllandindication sys
tem for submarine mines of improved apparatus
. nected to the line circuit through switchingmeans
to indicate-at a shore of?ce the entrance of. a
capable of connecting the control oscillator of
vessel-into the mine?eld and¢to ?rethemine .
any one of the‘ devicesand the operating oscil
lator to the line circuit to supply control current
and operating current to that device simulta
neously. Such switching means‘may, be. con
trolled. either manually or automatically.
approached.
A further speci?c feature of our ‘invention is
the provision of - improved indication and. ?ring
vapparatus for submarine .mines . wherewith. all
sources of power are located at ashore o?ice.
Other features, advantages and objectsnem
bodying our inventionwill. appear-as the‘speci
~ ‘?cation progresses.
To accomplish the‘? fOI‘EgOlIlg'. features, objects
vand‘ ‘advantages -of.'iour\ invention We provide a '
control o?ice with a plurality of different. cur
' rent~ sources‘ which. are ‘connected .in different
combinations ‘to a‘ two-conductor .line circuit: ex
tending‘ from the 'o?ice to ‘each 1of. a; plurality;of
1 devices that are ‘to beindicatedzand controlled, .'
excited in one sense to. actuate a' ?rstv indicator
when the indication current is decreased and is
excited in another sense .to: actuate. a second; in
dicator when such indication current is increased.
The control and operating oscillatorsare con
Each device is provided With an electric'equip_
ment' which includes indication apparatus, con
trol ‘and operating apparatus and testing and re
set means.
‘
' The indication apparatus of each ' equipment
includes an ampli?er normally powered by the
direct current-and commercial- alternating cur
rent supplied tothe line circuit'at the o?‘ice, a
detector unit, twoindication relays preferably of
the bias polar type and aselector or. shunt cir
cuit. The-indication relays are connected to
2,409,720
the output side of the ampli?er and the detector
unit is connected to the input side of the ampli
?er to operate the relays one after the other in
response to a predetermined condition or event
at the particular device. Either one of these indi
cation relays when operated alone connects the
shunt or selector circuit which includes a ?lter
across the line circuit.
Such ?lter is tuned to ‘
resonance at the frequency of the indication
oscillator of the same device. Thus when a selec
tor circuit is connected to the line circuit,
the circuit is detuned, asfar as the respective
indication oscillator is concerned and its indica
tion or line charging current is materially reduced
and such reduction of the current supplied by the
one oscillator is effected with substantially no
change in the current supplied by any one of the
4
OF designates an omce from which a submarine
mine field is controlled. Such mine ?eld will
include a number of mines or a plurality of
similar groups of mines, there being a sufficient
number of mines to protect a given area. In Fig.
.1 only two mines Ml and M2 of a mine ?eld are
shown, since the mines are alike and two are
sui?cient to fully illustrate our invention. Oi?ce
OF may be on shore or any other place in the
vicinity of the area that is protected, and the
o?ice and mines are connected by a transmitting
or line circuit which preferably comprises a me
tallic conductor as one side of the circuit and the
ground path as the other side of the circuit,
although a second metallic conductor can be
used. In Fig. l, a cable Ll extends from the o?ice
to a distribution point DP conveniently located
with respect to the mine ?eld and single conduc
tor cables ML! and ML2 extend from the dis
tribution point DP to mines MI and M2, respec
tively.
Thus a two-conductor line circuit
extends from the office to the mines in multiple,
one side of such circuit including the conductor
Li and the other side being completed through
eifect through the office receiver a second indica
tion. A condenser is at times connected to the 25 the ground path as will appear from time to time
during the speci?cation. It is to be noted that
line circuit to be charged by the of?ce source of
line conductor Ll possesses distributed capaci
direct current and then at other times it is con
tance with respect to ground and to visualize such
nected to the indication relays to reset these
capacitance a dotted line condenser CL has been
relays to their normal positions due to the dis
30 added to the drawings but it is to be understood
charge of the condenser.
this condenser forms no physical piece of appa
The control and operating apparatus of the
ratus. Fuses IE1 and II are interposed in cables
equipment of a device includes two control relays,
ML! and MLZ, respectively, for reasons to appear
one connected to the line circuit through a filler
hereinafter.
tuned to pass current only of the frequency of the
The apparatus at of?ce OF comprises different
control oscillator of that device. The other con
sources of current and indication apparatus, to
trol relay is connected to the line circuit through
other indication oscillators. The indication relays
govern the selector circuit to connect it from the
line circuit when both indication relays are oper—
ated, so that with both relays operated the indi
' cation current supplied by the respective indica
tion oscillator is increased to its normal value to
-
'
‘
>
‘ a ?lter tuned to pass current only of the fre
- quency of the operating oscillator. These two
gether with control, testing and cancelling means.
The current sources include a battery, a source
of commercial frequency alternating current and
control relays govern each other and a pumping
action results when control and operating cur 40 a plurality of oscillators. Battery 12 is prefer
ably of a relatively high voltage, such as 250 volts,
rents are supplied to the line circuit simultane
suitable for energizing electron tubes, and it is
ously. The equipment of each device also in
connected across the line circuit by its positive
‘ cludes a condenser of relatively small capacity
terminal B250 being connected to cable Ll
and a condenser of relatively large capacity. The
' pumping action of the control relays connects the
- small condenser to the line circuit for it to be
charged by the direct current source and then
connects this condenser to the large condenser to
discharge the small condenser into the large con
denser. After several such operations the large
condenser is charged to a point where it excites
an associated gas ?lled tube to the breakdown
' point and the large condenser discharges through
the tube in series with an operating unit'of the
device causing operation of the electric equip
ment. The control relay alone is used to test the
- indication apparatus.
' through an inductance I 3 and its negative ter
minal N256 being connected to a ground elec
trode ill. The commercial source of alternating
' current includes a transformer TP, a secondary
winding of which is connected to ground electrode
i4 and to line conductor Ll through a ?lter 9
turned to pass current of 60 cycles per second.
The office oscillators may be of any one of several
types, and preferably they are of the electron
tube type powered from battery I2 or some other
convenient source, and these oscillators are shown
> conventionally for the sake of simplicity.
A con
tro-l oscillator and an indication oscillator are
provided at the office for each of the mines, to
We shall describe several forms of apparatus
gether with a ?ring oscillator which is common
embodying our invention, and shall then point
out the novel features thereof in claims.
60 to the mine ?eld. Indication oscillator 18] and
control oscillator CS1 for mine Mi, and a ?ring
In the accompanying drawings, Figs. 1, 2 and 3
or operating oscillator FS only are shown in Fig. l
are diagrammatic views showing three different
in order to not unduly complicate the drawings
' forms, respectively, of apparatus each of which
because these oscillators are sumcient for an un
embodies our invention when used for control
‘ and indication of a submarine mine ?eld. Fig. 4 65 derstanding of our invention. These oscillators
\ supply current at different frequencies and to
' is a diagrammatic view showing a modi?cation of
‘ aid in understanding the invention we shall refer
- the apparatus of Fig. 3 that we may use, and
to the frequencies of oscillators ISI, CS1 and FS
which also embodies the invention.
as being fl, I20 and ,f30, respectively.
In each of the different views, like reference
Indication oscillator 18! is normally active due
characters are used to designate similar parts.
70
a to its input side being connected to terminals
It is to be understood that our invention is not
B258 and N256 of battery 12, and the output side
limited to submarine mine ?elds, and this one
of this oscillator is connected to conductor Ll
‘ application serves to illustrate the many cases
. and ground. electrode 15 of the line circuit
" where such apparatus is useful.
Referring to Fig. l, the reference character 75 through a ?lter Fl comprising a transformer TI
2,409,720
7
spect to the armature 28 and the permanent mag
tion, that is, it now flows in the direction indi
net and other parts of the relay, armature 28 is
held at this right-hand position with a relative
ly strong pull, so that if winding 29 is energized
cated by the arrow placed on winding 34 of relay
D2. Armature 34 of relay D2 is now operated to
its left-hand position, but armature 28 of relay
DI remains at the right-hand position because
by current flowing in the direction opposite to
that indicated by the arrow, the energization is
the energization effected through winding 29 is
inelfective to overcome the relatively strong pull
ine?ective to move armature 28 away from the
of the magnetic bias of the relay.
right-hand position unless the value of current
Relays PI and P2 are direct current neutral
is many times that required to operate the ar
mature from the mid position to the right-hand 10 relays that are governed by the indication relays
DI and D2 and by each other in a manner to
position. Winding 38 of relay Dl is a reset wind
appear shortly.
ing and the number of turns of this winding and
The shunt or selector circuit includes a ?lter
the proportioning of the parts are such that when
MFI comprising inductance and capacitance
current of a given value ?ows therethrough in
the direction indicated by an arrow placed on 15 tuned to resonance at the frequency of fl, that is,
at the frequency of the indication oscillator ISI
winding 36, the armature 28 is moved against
for mine MI. This selector circuit extends from
the relatively strong pull of the magnetic bias
cable MLI of the line circuit through ?lter MFI,
back to the mid position. Thus, a relatively weak
back contacts 36 and 31 of relays P2 and PI, re
energization of the relay by current flowing
through winding 29 in the direction of the arrow 20 spectively, and either through contact 32-33 of
relay D2 and condenser C2 to ground electrode
placed on that winding is su?'icient to operate
38, or through contact 28-3I of relay DI and
armature 28 from the mid to the right-hand po
condenser Ci to ground electrode 38. Condensers
sition but a relatively strong energization of the
CI and C2 are relatively large and do not appre
relay by current of a given value ?owing in wind
ing 30 in the direction of the arrow placed on 25 ciably affect the tuning of the selector circuit. It
follows, that with either relay DI or D2 operated
that winding is required to reset the armature
the shunt or selector circuit is connected to the
28 back to its mid position. Armature 28 re
mains in the position to which it was last moved
when the relay is deenergized. Relay D2 is of
like construction, except it is arranged for its
armature 32 to be moved from the mid position
to a left-hand position as viewed in Fig. 1 to en
gage a contact 33 when operating winding 34 of
line circuit.
When both relays DI and D2 are operated, the
relays PI and P2 are supplied with direct current
from the line circuit through inductance 39, con
tact 28—-3l of relay DI, contact 32—33 of relay
this relay is energized by current flowing in the
direction of the arrow placed on winding 34, and 35
armature 32 is reset to the mid position when
reset winding 35 is energized by current ?owing
in the direction of the arrow placed on that wind
ing. Windings 29 and 34 are connected in series
to the two portions of secondary winding 63 of
transformer 23 through contact member-8 of the
coder, contact member 8 serving to rectify the
electromotive force induced in secondary wind
D2, winding of relay PI, back contact 4|] of relay
P2, and ground electrode 38, and relay PI is ener
gized. Relay PI when energized to close front
contact 4I completes the connection for relay P2
to the line circuit and relay P2 is energized and
picked up to open back contact 48 to deenergize
relay PI, Which latter relay is released to open
front contact 4| and deenergize relay P2. Thus
relays PI and P2 are energized with a pumping
action Whenever relays DI and D2 both occupy
their operated positions.
Such pumping action
of relays PI and P2 serves to intermittently open
the selector circuit at back contacts 36 and 31.
Relays DI and D2 are reset through the means
ing mine MI, a steady state condition exists for
of a condenser C3 and a relay AAI. With relay
ampli?er .AM and relays Di and D2 are deener
AAI energized in a manner to appear hereinafter
gized. When a vessel with a steel hull and other
to close front contact ‘I0, a circuit path is formed
magnetic and electric parts approaches, a mag
for direct current to flow from cable MLI of the
netic ?eld is created and magnetic flux threads ‘
- line circuit through inductance 39, resistance 'II,
core 24 of unit DU, such flux being variable due
a coil ‘I2, the function of which will appear here
to the motion of the vessel and other conditions.
inafter, front contact ‘II! of relay AAI, condenser
This induces an electromotive force in coil 25, and
C3 and ground electrode 15, and condenser C3 is
such electromotive force is periodically inter
rupted or chopped by operation of coder contact III Ct charged by the direct current of the line circuit.
When relay AAI is subsequently deenergized, the
member 1 and a corresponding coded electromo
condenser 03 is disconnected from the line cir
tive force is created in the secondary winding of
cuit and is connected to the reset windings 30 and
transformer 62 to be applied to tube 26, causing
of relays DI and D2, respectively, through back
a corresponding variation of current to appear in
the plate current of the ?nal stage tube 22, with 60 contact ‘I? and ground electrodes 18 and ‘I5, and
the discharge of condenser C3 ?ows through
the result a corresponding electromotive force is
windings 39 and 35 in the direction indicated by
created in secondary winding 53 of transformer
the arrows and is of a su?icient value to cause
23, This latter electromotive force is recti?ed
the relays to be reset.
by action of contact member 8 because contact
The control and operating apparatus of the
member 8 is operated in step with contact ‘mem
equipment for mine MI includes control relays
ber 7, and recti?ed current flows in the windings
AI, BI and ABP, a gas ?lled tube I, condensers
29 and 34 of relays DI and D2, the connection
C4 and C5 and a detonator DDI. Relays AI, BI
being such that this current flows in the direction
and lABP are neutral relays and relay AI is con
of the arrow placed on winding 29 and armature
23 of relay Di is operated to the right-hand posi 70 nected to cable ML‘-I and ground electrode 42 of
the line circuit through a?lter CF, a recti?er 43
tion, but armature 32 of relay D2 is retained at
and front contact 44 of relay BI; and relay BI
its mid position. When the vessel passes over the
mine, the magnetic held about unit DU is op
is connected to the line circuit through a filter
positely varied so that the recti?ed current ?ow
BF, a recti?er 45 and back contact 45 of relay AI.
ing 63 in the well-known manner.
Normally, that is, when no vessel is approach- ‘
ing in windings 29 and 34 is of the opposite direc
75 Filter CF is tuned to pass current only of the fre
2399339,.
9,
10
the mine andnpasses over the mine, the magnetic
quency f2ii,that is, current only of the frequency
supplied by the control oscillator CS1 formine
?eld vere'a'tec by the ‘vessel is'of the opposite nature
anufinnu'é?ces 'theu'ni't‘DU ‘at ‘ampli?er AM to"
Ml; Filter BF is tuned to pass current only of the
frequency fSi'l, that is, current supplied by the
?ring oscillator FS. Thus, when currents from
both oscillators CS1 and ES are supplied to the
line circuit, relays AH and Bl are energized and
deenergized with a pumping action because each
relay controls the other. Relay ABP has one ter
minal of its winding connected to ground elec~
trodell‘é and the other terminal of its winding
connected to cable lViLl through front contact 4?
of relay Al and an inductance 48, and relay ABP
is operated in step with the operation of relay A!
dueto being energized by the direct current from
cau'?se‘current to‘?ow'in the operating'windings
of relays ‘Di and D2 ‘in the oppositev direction from‘
that ?rst described, andrelay D2 is ‘operated, the ‘
first‘rela'y D! being retained‘ at it'soperatéd posii‘
ti'51'i“dué"to-the "strong magnetic bias of‘ the relay'."
With both'rel'ays 'D'l 'and‘DZ' ‘at-“their operated
positions 'the‘a'ssociated relays P'! vand‘ P2 are one
ergi zed ‘with a *pump'ingaction i causing the‘ shunt
circuit‘ to‘v be‘ ?rst‘dis'connect‘ed‘ from the line‘cir
cuit ahdthen thereafter intermittently connected
idisconne‘ctediro'n'i the: line circuit.‘ 'The‘?rs'ti
"e the ‘shunt c'irc‘uitiis ‘disconnected ~the indical‘
current" rom oscillator 'ISI 'is‘increased to'its'
the line circuit.
Condenser Cél is normally charged by direct
area ie/
‘the: ’ receiver R'Al' is ' energized ‘
edu‘ir'ed‘tof'illuminate the second indicator"
current‘supplied' from the line circuit due to one
terminal of the condenser being connected to
lamp 521,-“‘the display of lamp'E-‘l' serving asa'n'in
ground electrode £9 and its other terminal being
connected to cable ML! through back contact
58 of; relay ABP, resistance 5! and inductance 48.
dicat'i'on to the'operatcr "of the vp‘re'sen’cerof ‘the’
ves's'el'within thede‘structing area ‘o'f'm‘in'e Ml.’
When relay ABP is picked up to open back con
tact?? and close front contact 52, the condenser
C4 is disconnected from the line circuit and is
actionTt-ojcancel‘the illumination of lamps‘5'lv and‘v
5' "as "he cani’iif'a manner t'o'be'explained‘shortlm
pumping action ofr'elaysrr and P2 'will‘ini
media’télyiestore‘ the“ illumination 'of the’lamps
"'It'ii's to5bc'ob‘served'that if the operator takes
connected to condenser C5 through resistance 53,
and condenser C'él discharges into condenser C5.
Condenser Cl; is of relatively small capacity and
condenser C5 is of relatively large capacity, and
consequently several operations of relay ABP are
required to alternately charge condenser C4 from
main‘ at their‘ ope‘rated'positions
"-
s
"For the operator to "fire mine‘ MI in response
to the indicationTdispIayed by lamps 51 and 66;
an’ arming'switch S‘l would ‘be moved either up
the line and then discharge the condenser into
ohddiriii to abs-stoma 64 and complete'a' cire
condenser C5 before condenser C5 is fully charged.
cu'it’ *ror ‘ energizing ' cbntrol" ‘oséillator’CS I , from
‘ Condenser C5 is connected across control. ele
ment Eli and cathode 55 of tube Vi through a ‘
voltage divider consisting of resistors o5 and 53,
and is connected to anode ?athrough an element
85, of the detonator 13134. The parts'are pro
battery'WZ. Tmmediatély‘after the'operation of
switch VS! a sécbnd‘zor ‘?ringiswitch'l'sl‘would
be closed? The closing" orfcontactts or switch‘
I'SA'I gcornpletesaciréuit for energizing ?ring -‘osci1-; '
lator iFS Jfrom ' battery “l 2 far'fdT the ' closing" 'of ‘con
portioned so that when condenser C5 is substan
tact 6‘! of switch ISI completes a circuit‘ path
tially‘ fully charged, tube Vi is excited to its
breakdown point and condenser C5 discharges
for eoeaeeane'tne‘ output sides" of oscillators CSl.
and Yes, t6? the ‘linear-‘suit. “'With‘both'“control
cu-rreriti'a'n'd ?ring 1‘ current supplied to‘ the" "line
through the element 69 and the anode-cathode
c'ircu , both’ control rélay's-‘Al'fan'd' Bl' are" en'e’r}
path of the tube andsuch discharge current is
gi'z'ed" and are ‘ operated by‘ a :pumping ‘action be
ofa' value to heat element 653 to cause the detona
tor to ?re the mine.
45 cause 'these'lrel’ay's' controleach'TotherJ? Relay
ABP 'is operated in step ‘with irel‘ay Al "and 'cor'i-v
Relay AM is connected across the output termi
d'en'Ser'CB-i's gradually ‘charged 'due to the opera’,
nal of recti?er 12-3 and thus is energized when con
tion-of charging condenser C4 from the’lin'e' and:
trol current from oscillator CS! is supplied to the
‘then '~'d_iscli_arg5lng'condenser "Cd into ' condenser
Normally the line circuit is energized by direct 50
'When'th'e charge on condenser C5 builds: up
td‘a predetermined pointj-th’e- tube VI breaks
current from battery l2 and by 60 cycle alternat
down and condenser (35' discharges through the
ing ‘current from transformer TR and is also
excited by each of the indication oscillators, each
detonator-toi'firei'the miné.‘ ‘
I
"
Y- -'
“"Ifh'e': j-‘i'n'g of mine Ml would tear the mine end
indication oscillator supplying a normal value of
line charging or indication current. At mine Ml 55 of cable’MIai loose an'd'this cable‘ would become
grounded causin'g‘an excessive ?ow of current and‘
the amplifier AM is powered by the direct current
fuse‘liifwould blow to v"free the system of the
and by the 60 cycle alternating current and is in
cable to the‘ ?red minei
’
'
> f‘ >
'
> ‘
an active condition. Likewise, the ampli?er at
‘It'is to be noted; that the operator can ?re mine
each'of the other mines is in an active condition.
MI by operation‘ of switches st and IS! at-any
Assuming a vessel enters'the mine ?eld to ap
ti,me,'such" action being ‘independent of the indie
proa'ch mine Ml, the magnetic ?eld created by
cation'apparatus; It'is clean'however, that the
the vessel in?uences unit DU and current ?ows
action~ of ?ring the mine can be made'autor'natic
in the operating‘windings of relays D! and D2
or "can be" made“ dependent‘ upon ‘the indication
a direction that operates relay Di and con
line
circuit‘;
"
'
'
‘
'
-
'
nec‘ts the shunt circuit including'?lter MFl across
65
means of_‘ relays controlled in 'multiple with the
the line circuit. The connecting of ?lter MFI
“Vle'shallj next ‘assume that a vessel approaches
miner/n ‘to'bring‘about the display of lamps
ols'cille or IS; and the indication current supplied
5? ‘and ‘66 as described hereinbefore, and’the op-‘
byo'sciliator 153 is reduced from its normal value;
such reduction of the indication current ener 70 erator desires not to‘?re the mine and wishes ‘to
reset ‘relays DI and D2 and cancel the display
gizfng receiver EAL in the manner required to
across the line circuit detunes the line circuit for
illuminate indicator lamp
The illumination
oi lamp
serves as a warning indication to the
since operator of the presence of a’vessel and for
liinito'be on the alert A‘s'the‘vessel approaches
of'lamps '51 and 636'. Under this condition the
switch "Si “would be moved to energize control
oscillator CS! and‘a reset switch IS2' would be
operated‘ to the left‘ as viewed in Fig. l to close
2,409,720 '
12
11
ent, however, from the corresponding elements
contacts 68 and 69. The closing of contact 68
connects the output side of oscillator CSI to the
line circuit to energize relay AAI at the mine
and bring about the charging of condenser C3.
The closing of contact 69 completes an obvious
circuit for an o?ice relay XI, and relay XI is
picked up to close a stick circuit which includes
its own front contact ‘I4 and a normally closed
contact SI of switch IS2. The operator would
next move the switch ISZ from the left-hand 10
position to the right-hand position opening con
tacts 68, 69 and 6| and closing a contact 16.
The opening of contact 68 interrupts the supply
of control current from oscillator CSI and relay
AAI at the mine is deenergized to connect con
denser C3 to the reset windings of relays DI and
D2 and these relays are reset to their normal
condition by the discharge of condenser C3. The
of Fig. 1. It is believed that an understanding
of the mine equipment of Fig. 2 can best be had
from a description of the operation of the appa
ratus taken in connection with a description of
the apparatus of Fig. 1.
Normally, that is, when no vessel is approach
ing the mine ?eld of Fig. 2, the line circuit is en
ergized by battery I2 and transformer TP at the
o?ice, and ampli?er AM at the mine is powered
and made active. Also, the line circuit is excited
by the indication oscillators for the several mines,
each such oscillator supplying a line charging or
indication current of a given normal value.
When a vessel approaches mine MI of Fig. 2, for
example, the electromotive force created at unit
DU is applied to ampli?er AM and relay DI is en
ergized at a polarity as required to operate the
relay to close its contact ‘28—-3i. The closing of
opening of contacts 69 and ‘BI deenergizes relay
3! of relay Di connects the selector
XI, but relay Xi is slow release in character and 20 contact 2
circuit including ?lter MF! across the line circuit,
during the slow release period of relay XI a cir
suchselector circuit extending from cable MLI
cuit is formed from terminal B of a source not
through ?lter MFI, contact 28-3I of relay DI,
shown through contact 16 of switch IS2, front
a condenser C6 and ground electrode 38. Con
contact 19 of relay XI, and winding of relay CM
denser Cfc‘ is of large capacity and does not ma
to terminal C, and relay CM is energized and
terially aiiect the tuning of this selector circuit,
picked up to open back contact I9 and close front
and consequently the indication current supplied
contact 80. The opening of back contact I9 of
by oscillator ISI is reduced. This sudden reduc
relay CM opens the anode circuits for tubes V3
tion in the indication current energizes receiver
and V4 and they are deionized so that the lamps
RA! as required to illuminate lamp 66. As the
5‘! and 66 are extinguished. The closing of con
vessel moves closer to pass the mine, the electro
tact 89 of relay CM is ordinarily ine?ective to
motive force created through unit DU results in
maintain the anode circuit for the electron tube
the current supplied to the operating windings of
closed through the normal position of switch SI
relays Di and D2 ?owing in the opposite direc
because switch SI is now set at either the raised
tion from that ?rst supplied, and the armature
or lowered position. The contact 80 and the con,
of relay D2 is operated to close contact 32-33,
nection through switch SI are useful in connec
relay D-l remaining in its left-hand position duev
tion with the control of other mines of other
to the strong magnetic bias of the relay. With
groups.
both relays DI and D2 operated, direct current
We shall next assume that the apparatus is in
?ows from cable ML! through inductance 39, re
its normal condition and the operator desires
sistance BI, winding of a relay AAZ, contact 29—
to test the equipment at mine MI. Switch SI
35 of relay DI, contact 32-3-3 of relay D2 and
is set to energize control oscillator CSI and switch
to ground electrode 38. Relay AAZ is a bias polar
IS’! is moved to the left to connect the output
relay and the connections are such that the cur
side of oscillator CSI to the line circuit and to
rent thus supplied to the relay causes the relay
also energize the o?ice relay XI. Relay AAI at
to be energized at a polarity to operate its con
mine MI is energized by the control current and
tact members 32 and 83 against a spring bias
condenser C3 is charged as previously explained.
force to open contact 83—84 and close contact
The initial surge of charging current ?owing
$2-85. It is to be noted that contact 83-84
through coil 12 associated with the unit DU in
?uences the unit DU in a manner to bring about
controls a circuit by which a condenser C3 is nor
operation of relay DI to connect the shunt cir
mally charged by direct current supplied from
the line circuit through inductance 35-), resist
cuit to the line circuit so as to reduce the indica
tion current from oscillator ISI and cause lamp
66 to be illuminated. The parts are proportioned
so that the dying down of the current as con
denser C3 reaches a fully charged condition in
?uences unit DU in a manner to bring about op
eration of the second relay D2 and the indicator
lamp 5'! is illuminated due to the action of relays
PI and P2 to interrupt the shunt circuit to restore
the indication current to its normal value. Illu
mination of lamps 51 and 66 would serve to indi
cate that the line circuit to mine MI is complete,
ampli?er AM is active, unit DU is effective and
relays DI and D2 are in an operative condition.
Movement of switch IS2 to the right results in
theresetting of relays DI and D2 and the can
celling of the display of lamps 51 and 65 in the
manner explained previously.
In Fig. 2 the o?ice apparatus and the equip
ment for mine MI comprises as essential ele
ments, indication apparatus and control and ?r
ing apparatus, together with reset and testing
apparatus, the same as in Fig. 1.
Several ele
ments of the mine equipment of Fig. 2 are differ
ance ll, contact 83—8¢l and ground electrode l5.
Operation of relay AA2 to open contact 83-—8!l
Oi Oi and close contact &2—85 transfers condenser C3
to the reset windings
and 35 of relays D5 and
D2 and the discharge current from condenser C3
resets these relays. With relays DI and D2 re
set the selector circuit is opened so. that the indi
60 cation current from oscillator IE3! is restored to
its normal value and receiver RAI is energized as
required to illuminate lamp 5?.
To ?re mine Ml of Fig. 2, the operator moves
switches SI and ISI to supply both control and
65 ?ring current to the line circuit. The control
current is passed by ?lter CF to a control relay
A3 of the bias polar type, the connection includ
ing a normally closed contact 86 of a second con
trol relay B3, which is also of the bias polar type.
70 With relay A3 operated to close contact 81, the
connection of relay B3 to the recti?er 45 is com
pleted and relay B3 is energized by the ?ring
current passed by ?lter BF, Such operation of
relay B3 opens contact 86 and relay A3 is deen
ergized and operated back to its normal condi
13
i4
tion to open contact . 8.1V and; cause. relay,‘ Bl3gto. be
deenergized; and operated to its normal condition. _
This pumping actionpithetwo control-_~relays.A_2_1
and~B3 will continue aslong. asi-control and. ?ring».
lays DI and D2 opens the, selector. circuit‘. and
also the circuit for relay AAZ. The openingQof
the: selector circuit causes theindication current
to berestored to, its normal value to bringabout
currents are supplied; to the linercircuit. Con.
the illumination of lamp 51, and, the deenergizjing.
denser 04* of
2 is normally chargedby. direct I
current ?owing from caplet/ll; , through-induct
ance 39,! normally closed contact 8,3;of;re1 y .53,
resistance 89,;norma1ly closed contact,Qilrotrelay
B3, condenser- C-‘t and- to" ground electrode, 45‘. 10
During-the interval the’ two relays A??? arr-d133,,
are operated to close contacts; 9,! and ii‘lqrespecg
tively, condenser C4 isrconnectedito cendenserqi
and discharges thereinte. wrmlenserv Cir: heirs.
0f;relay, AAZpermits this relay to be. restoredrito.
itsnormal position.’
To ?re mine-M! of Fig.v 3,.thteuoperator. oper-v
ates the switches SI and lSlto bring aboutthe
supply of both; control, currentand :?ring. current
to the line circuit. Control current is passedby
?lterCFnto energize control relayLAii. Relay A3,.‘
isoperated to :open; contact stand. close contact
93.
.operationyoi contacts. Biand ?dserves
small as ccmraredto. condenser C5,; the sari 291.52»: 15 to connectcondcnsencl‘and coil it across the‘
inFia 1,. Consequentlyafter-sacral Operatiges.
oi the-two control-relays; a charge-is builtaipon
condenser C5 which is conneqtcdto tube Vii and
detonator- DDE by circuits; which’ are- the; same
lineicircuit-to charge condenser Cl? through coil
The. initial surge § of'chargingv currentv in;
fluences coil ‘i2. to bring . about. the operation of r
relay Di, andas the condenser Ci :becomesiully
as in Fig. 1. When thisvcha-rge on condenser-0'5 20 charged; the.v dyingv away of they chargin'gl cure
reaches a’ given value’. tube Vl'breaks downr'agnd;
rent in?uences unit EU} to .bring', about.
op
condenser 05; discharges» through the tube and
the d'etonator element-Eibto?re the mine.
eration- of. relayDZ. ‘Relay. AAL'Iis again; encr';
gized and then. restored- to. its. normal" position.
and the closing of contactv $1.01‘ relay .AAlcdi?é
To test the equipment ofymine Mr’! of‘ Fig.- 2,1the,
operator moves. switches Si- and ISZ; to‘ supply 25 pletes thecorinection for- control relay B5.
that relay is energized by tha?ringcurrentflow}
control current to the line» circuit‘ and» operate
throughr?lter BF; Relay. Ba. onceqperated
relay A3 to close contact. 9,3;andopena normally
closed contact 34, so thatacondenser- C'hlS-COIl-r
nected; to the line circuitto be. chargcdiby-the
direct current, current, ?owing- froin conductor .
completesa ‘stick circuit inelu'dingits owncontact.
98 to by-pass contact Sl'ofrelay. Adi’; Vyjithrer,
lay AAZ restored. to itsv normal position, andboth
MLI through inductance 39; resistance ‘H,v con
relays. A3. and B3 operated 'a' connectionis com;
tact 9,3 of relayAB, coillZ, condenser Ci, resist-.
pleted from cable MLi throughinductance ~. ,,
ance, 95 andto ground electrode. 95. The initial
surge of current‘through coil’ ‘l2 creates; an elec
tromotive force in unit DU'that results in opera- i;
tion of relay Dl'to bring about a reduction of the
contact, lutof; relay AAZ,’ contact it} of relay;
A3, contact it? oi relay, B3,. resistance. ititqan'd.
condenser Cato ground “electrode lid, andacharge
indication current and the resultant illumination
isereduellrbuiltue on waders-each ceiidéelsler:
C5 is connected to tubeVL andtothedetonator
of lamp?s. The parts are proportioned so that
as the current dies down when condenser C‘! be
DD l, the..same.-as__ in . Fig. ,1, and .when. the charge,
on condenser C5 becomesu?ficient,toieiiciteltube,
comesfully charged, the electromotive force cre 40. VI to the. breaking downipQint/the, tube Vi? be}
comes. conductive. and‘ condenserbdi discharge"
ated at unit-DU isof-the polarity and character
istic that bring about-operation of relay D2, and
through the detonators to.
the, mine, The‘
testing of the. apparatus, of Fig. 3 would 'beace
with both relays Di and D2 operated, relay AAZ
is energized'to open the selector circuit and the
comnlisheci in- substailtielly. iheisems
as
explained in connection. withzt'he testing'oi the
indication current is restored’ to its normal value
apparatusof Fig. 2‘.
'
' "
‘
to bring about the illumination of’ lamp 5?.
Fig- 4 ‘3359101568v a modi?er-tige- Of» tlfléi aFigarr'aiH?
In Fig. 3, the apparatus at the o?ice and the
mine equipment are the same as in Fig. 2 except
of Fig. 3 that wemay use. InFig. 4i, condenser
C5 of the mine equipment isnormally chargedby
for the circuit connection for the control portion
of the mine equipment, and the apparatus of Fig. 9 direct current from the, line circuit through a
3 Will be readily understood from an inspection of
relatively high resistance, i535. Thus, when con
Fig. 3' taken in connection with the description of
trol relays A3 andB-iare. operated. in response
the‘apparatus of Figs. 1‘ and 2. Normally,v the
tocontrolgand ?ring. current, and the associated
ampli?er AM'ofFig, 3 is powered by direct cur
relay AAZ‘ hasbeenrestored toits normal ppsig
rent and 69‘ cycle alternating current supplied 55 tion, the condenser C5 discharges through the
to the line circuit at the o?lce. A vessel ap
circuit connection including.’ contacts. tee,‘ 10 i. and
proaching mine Ml of Fig. 3 causes the operation
it; of‘ relays, Ant, A73; andBS, respectively, and
of relay Di in the same manner explained in
the detonator, and the detonatoris ?red in re:
the previous cases and operation of relay Di
connects in. turn the selector circuit including
sponse to the discharge current.
?lter MFS to the line circuit to bring about a re
duction in the indication current supplied by os~
cillator IS! and the resultant illumination of
lamp 6%. With the vessel passing over the mine
vantages that all Seems 0?; Gwen-i for indie
Ml, the influence of'unit DU brings about operation of relay Dita-s previously explained. Opera
tion of both relays DI and D2 of Fig. 3 result
in relay AAZ being connected to the line circuit
and energized by direct current from battery E2.
Energizing of relay AA2 to open contact ‘til-~34
and‘ close. contact 82~—B-5 disconnects condenser
C3 from the line circuit and connects
to the
reset windings of relays Di and D2, and these re~
lays are reset by the discharge from condenser
C3‘ as previously explained. The resetting of re
-
'
'
'
'
i
Apparatus such as here disclosed has the ad:
Gating’ warming the
Qf. a miss-?eld are
loeatedin 2i seem 911306. a reiaiivelrmgn decree.
of selectivity isobteined in the ‘*‘dica-tion of the
approach of vessels to
in.
ua-l mines of
the mice ?eld, all-01th‘? non‘ - cf; the mine 0;?
the mine due toshocl; excita?on or foreign cur
reniisminimizea
-
r
'
Ahheueh We have herein Shawn and» described
several forms. of; selective, control’ and indication
systems embodying our inyention, it is under
stood that various changes and modi?cations
may be made therein within the. scope of; the 2.;:—_
pended‘ claims without departing from thespirit
and scope of- our invention.
2,409,720
151'
claim is:
~
' 1. In combination, an office, an electric equip
ment connected to said of?ce by a line circuit, 7
said normal value, and office indicator means
coupled to the o?ice ?lter and operated to ,a?rst
ora second condition according as such flow of
an of?ce indication oscillator of o a preselected
frequency connected to said line circuit to supply
a line charging current of a given normal value,’
two indication relays at said equipment, means
including a magnetic responsive unit connected
to said relays to operate one relay in response to
16
tures of, said relays to their given positionsto
disconnect said selector circuit andrestore the
current supplied by said indication oscillator to
Having thus described our invention, what we I
' indication current is reduced or restored.
4. In combination, an office, an electric equip
ment connected to said o?ice by a line circuit, an
10
o?ice , indication oscillator of a preselected fre
a ?rst condition ‘of a magnetic ?eld and to oper- ~
' ate the other relay in response to 'a second con
quency connected to said line'circuit to supply a
line charging current of a given normal value and
dition of a magnetic ?eld, a selector circuit in
cluding a ?lter‘tuned to resonance at said pre-~
,which current serves as an indication current,
tion relays to be connected across said line cir
cuit when either one of said relays is operated to
7 said relays to selectively operate the relays in,
response to a ?rst and'a' second given magnetic,
tWo indication relays at said equipment means
selected frequency and governed by said indica l5 including a magnetic ?eld detector connected to
varythe valueof the current supplied'by said
‘ indication oscillator to said line circuit, means
?eld condition at said equipment, a selector cir
, cuit including a ?lter tunedto resonance at said
controlled jointly by said relays when both relays 20 preselected frequency and connected across said,
~ line circuit through an operated position contact
are operated sequentially to disconnect said se
of either one of said indication relays to reduce
lector circuit to restore the current supplied by
the value of said indication current, two other
said oscillator to its normal value, and o?ice in
relays at said equipment, circuit means including
dicating means I coupled to said oscillator and
in series an operated position contact of each of ,
governed by the indication current thus supplied
said indication relays and contacts of, said other
by it‘to the line circuit.
relays to energize said other relays with a pump
'2. 'In' combination, an o?ice, an electric equip
ment connected to said of?ce by 'a line circuit, '
an o?ice indication oscillator of a preselected ire
ing action, a back contact of at least one of said
other relays interposed in said selector circuit
quencyconnected to said line circuit'to supply a ‘30 to alternately open and close the selector circuit
,to alternately reduce and restore the value of
line charging current of a given normal value,
said indication current, and office indicator means
two indication relays at said equipment, means
coupled to the connection of said oscillator to
including a control, unit connected to said relays
said line circuit selectively governed bysuch con
to effectively energize one relay in response to a
trol of the ?ow of said indication, current.
'
?rst given condition and to e?ectively, energize
' I the other relay in response to a second given con
5. In combination, an oi?ce, an electric equip- '
ment connected to said o?ioe by a line circuit,
dition, a selector circuit including reactance con
an of?ce indication oscillator of a preselected fre
nected to said line circuit through a contact of
quency and an of?ce source of direct current con
either-one ofv said relays closed when‘ the relay
is effectively energized to reduce the value of the 40 nected to said line circuit to supply a line charg
ing current of a given normal value and which
current supplied by said oscillator, means gov
current serves as an indication current, two in
erned by said relays to disconnect said selector
dication relays at said equipment, each of said
circuit from said line circuit when both relays
relays having an operating and a reset winding
are energized to restore the current supplied by
and an armature operable to a ?rst and a second
said oscillator to its normal value, and office indi
position, means including a magnetic field detec
cator means coupled to the connection of said
tor connected to the operating windings of said
oscillator to said line circuit and operated in one
sense when said ?ow of indication current is re
duced and in a second sense when the ?ow of the
relays to selectively operate the relays in response
to a ?rst and a second given magnetic ?eld con
50, dition, a selector circuit including a ?lter tuned
indication current is restored.
to resonance at said preselected frequency and
3. In combination, an o?ice, an electric equip
connected across said line circuit through the
ment connected to said o?ice by a line circuit,
second
position of the armature of either of said
an o?ice indication oscillator of a preselected fre
relays to reduce the value of said indication cur
quency, a ?lter, said oscillator connected to said
line circuit through said ?lter, said ?lter tuned 55 rent, another relay connected across said line
circuit through the second position of the arma
to create a resonant condition for said oscillator
tures in series of said indication relays to ener
and line circuit with its distributed capacitance
gize said other relay from said direct current
for the oscillator to supply a line charging cur
source, a condenser connected to said line circuit
rent of a given normal value, two indication re
lays at said equipment, each of said relays having 60 through a deenergized position contact of said
other relay to charge the condenser by direct cur
an operating winding and a reset winding and
rent and said condenser connected to said reset
an armature movable between a given and an
windings through an energized position contact
operated position, means including a magnetic
of said other relay to reset the indication relays
?eld detector connected to the operating Wind
ings of said relays to selectively operate said re 65 by the discharge of the condenser and disconnect
said selector circuit, and office indicator means
lays in response to a ?rst and a second given
coupled to the connection of said oscillator to the
magnetic ?eld condition at said equipment, a
line circuit energized by the indication current
selector circuit including a ?lter tuned to reso
thus supplied to the line circuit.
nance at said preselected frequency, said selector
6. In combination, an o?ice, an electric equip~
circuit connected across said line circuit through 70
ment connected to said o?lce by a line circuit, an
the operated position of the armature of either
o?ice indication oscillator of a preselected fre
one of said relays to detune the line circuit and
quency connected to said line circuit to supply a
reduce the value of current normally supplied
line charging current of a given normal value
by said indication oscillator, means connected to
and which current serves as an indication cur
said reset windings to at times reset the arma
a
2,409,720
17
rent, an electron tube ampli?er at said equipment
and including a ?rst and a second coder contact
member which are interposed in the input side
and output side respectively of the ampli?er, a
18
ual frequency, said direct current source and
indication oscillator connected to said line cir
cuit, switching means to at times connect said
control and operating oscillators to the line cir
magnetic ?eld detector connected to the input 5 cuit, a ?rst and a second indication relay at
said equipment, indicating means connected to
side of the ampli?er to supply a ?rst and a second
said relays to selectively operate the relays in re_
electromotive force in response to a ?rst and a
sponse to a ?rst and a second given condition at
second magnetic ?eld condition at said equip
the equipment, a selector circuit including a ?l
ment, a ?rst and a second polar indication relay
connected to the output side of the ampli?er to 10 ter tuned to resonance at the frequency of said
indication oscillator and connected across the line
selectively operate the relays in response to said
circuit through an operated contact of either
electromotive forces when thus coded and ampli
?ed, a selector circuit including a ?lter tuned to
resonance at said preselected frequency and con
nected to said line circuit through an operated
position contact of either one of said relays to
reduce the value of said indication current, means
including in series an operated position contact
of each of said relays to disconnect said selector
circuit to restore said indication current to its
normal value, and oi?ce indicator means coupled
to said oscillator operated by such indication cur
rent.
7. In combination, an o?ice, an electric equip
ment connected to said o?ice by a line circuit,
an electron tube ampli?er at said equipment and
having a ?rst and a second code operated contact
member which are operated in step with each
other and interposed in the input side and output
one of said indication relays to control the cur
rent supplied by said indication oscillator, an
o?ice indicator coupled to the line circuit ener
gized by such indication current, another relay
at said equipment connected to the line circuit
through a contact of each of said indication re
lays in seriesto energize that relay by said di
rect current source, a ?rst and a second con
trol relay at said equipment connected to said
line circuit vthrough a ?rst and a second ?lter
respectively, said ?rst ?lter tuned to pass cur
rent only of the frequency of said control oscil
lator and said second ?lter tuned to pass cur
rent only of the frequency of said operating os
cillator, a condenser and an operating unit of
said equipment, and circuit means including con
tacts of said other relay and said control relays
side respectively of the ampli?er, a magnetic ?eld 30 to connect said condenser at times to said line
circuit to be charged by said direct current source
' detector connected to the input side of the ampli
and at times to said unit to operate the unit by
?er to supply electromotive forces varied accord
the discharge of the condenser.
ing to given variations in a magnetic ?eld at the
equipment, a ?rst and a second indication relay
connected to the output side of the ampli?er and
10. In combination, an office, a submarine mine .
connected to said office by a line circuit, an o?ice
indication oscillator of a preselected frequency
and an o?ice direct current source connected to
amplifying of said electromotive forces, means
said line circuit, an ampli?er at said mine con
including contacts of said indication relays and
nected to said line circuit to be powered by said
connected to said line circuit to cause an indica
tion current to ?ow in the line circuit as prede 40 direct current source, two indication relays at
said mine connected to said ampli?er, a control
termined by the operated condition of said re
unit responsive in a ?rst and a second sense to
lays, and o?ice indicator means connected to the
the magnetic ?eld created by a vessel approach
line circuit governed by such indication current.
ing said mine and connected to said ampli?er to
8. In combination, an o?ice, an electric equip
control said relays according to the position of
ment connected to said of?ce by a line circuit, an
the vessel with respect to said mine, a selector
office control oscillator and an office operating
circuit including a ?lter tuned to resonance at
oscillator, said oscillators of different preselected
said preselected frequency and connected across .
frequencies, switching means to at times connect
said line circuit through a contact of either one
said oscillators to said line circuit, a ?rst and a
of said relays to decrease the ?ow of indication
second relay at said equipment, said ?rst relay
current from said oscillator, means including in
connected to the line circuit through a connec
series a contact of each of said relays t0 discon
tion disposed to pass current only of the frequen
nect said selector circuit to increase the flow of
cy of the control oscillator, said second relay
indication current, and of?ce indicators coupled
connected to the line circuit through a connec
to the connection of said oscillator to said line
tion disposed to pass current only of the fre
circuit and selectively governed to a ?rst and a
quency of said operating oscillator, contacts of
second condition according as said ?ow of indi
said relays interposed in such line circuit con
cation current is decreased or increased.
nections for each relay to control the other to
11. In combination, an o?ice, a submarine mine
e?ect a pumping action of the relays when both
selectively operated in response to the coding and
of said oscillators are connected to the line cir 60 connected to said o?ice by a line circuit, an office
indication oscillator of a preselected frequency
cuit, a relatively small condenser and a relatively
and a source of direct current connected to said
large condenser, circuit means including contacts
line circuit, an ampli?er at said mine connected
to said line circuit to be powered by said direct
and to said large condenser to build up a charge 65 current source, two polar indication relays at said
mine, each said relay having an operating and
on the large condenser in response to the pump
a reset winding, said operating windings con
ing action of said relays, and an operating unit
nected to the output terminals of said ampli?er,
connected to said large condenser effectively en
a magnetic ?eld detector unit connected to the
ergized when a predetermined charge is built up
70 input terminals of the ampli?er to govern the
on the large condenser.
polarity of the current ?owing in said operating
9. In combination, an office, an electric equip
windings according to a ?rst and a second mag~
ment connected to said of?ce by a line circuit;
netic ?eld condition created by a vessel approach
an of?ce direct current source, indication oscil
ing said mine to selectively operate the relays, a
lator, control oscillator and operating oscillator;
each of said oscillators of a preselected individ 75 selector circuit including a ?lter tuned to res
governed by said relays to alternately connect
said small condenser to a source of direct current
gleam
20
19
onance at said preselected frequency and con
nected across said line circuit through an oper
ated position contact of either one of said relays
to decrease the ?ow of indication current from
said oscillator, means including in series an op
erated position contact of each of said relays to
disconnect said selector circuit to increase the
'?ow of such indication current, o?ice indication
means coupled to said oscillator and selectively
responsive to such changes in the indication cur
rent, another office oscillator of a different pre
selected frequency disposed to be connected at
times to said line circuit, another relay at said
mine connected to the line circuit through a ?l
ter tuned to pass current only of said different
preselected frequency, a condenser, and a circuit
means including contacts of said other relay .to
connect at times said condenser to said line cir
cuit to charge the condenser by said direct cur
‘rent source and to connect at times said con
denser to said reset windings to reset said relays
‘by the discharge of said condenser.
12. In combination, an o?'ice, a submarine mine
connected to said of?ce by a line circuit, an o?'ice
indication oscillator of a preselected frequency
ent preselected frequency and connected at times
to said line circuit, another relay at said mine
connected to said line circuit through a ?lter
tuned to pass current only of said different pre- ‘
selected frequency to energize said other relay, a
coil disposed for magnetic relationship with said
detector unit, a condenser; and circuit means in
cluding a contact of said other relay to connect
said coil and condenser in series across said line
circuit to charge the condenser from said direct
current source through said coil to test the oper
ative condition of said line circuit, ampli?er, in
dication relays and indication means.
13. In combination, an office, a submarine mine
connected to said office by a line circuit, an o?ice
direct current source connected to said circuit, an
o?ice control oscillator and an o?ice ?ring oscil
lator, said control and ?ring oscillators of a ?rst
and a second preselected frequency respectively,
20 of?ce switching means to at times connect said
' oscillators to said line circuit, a ?rst and a second
relay at said mine, said ?rst relay connected to
said line circuit through a ?lter tuned to pass
current only of said ?rst frequency, said second
a selector circuit including a ?lter tuned to res
onance at said preselected frequency and con
relay connected to said line circuit through a
?lter tuned to pass current only of said second
frequency, a back contact of said ?rst relay in
terposed in the connection of said second relay
and a front contact of said second relay inter
posed in the connection of said ?rst relay to en
ergize said relays by a pumping action when both
of said oscillators are connected to the line cir
cuit, a relatively small and a relatively large con
denser, circuit means governed by said ?rst and
second relays to connect said small condenser
alternately to said line circuit and to said large
nected across said line circuit through an ener
condenser to build up a charge on the large con
gized position contact of either of said relays to
reduce the flow of indication current from said
gized position contact of each of said relays to
disconnect said selector circuit to restore the ?ow
denser due to the pumpingaction of said relays,
a gas ?lled tube, a detonator, and said large con
denser connected to said tube and detonator to
break down said tube and discharge said large
condenser through said detonator and tube to ?re
of said indication current, o?ice indicators cou
the mine.
and a source of direct current connected to said
line circuit, an electron tube ampli?er at said
mine connected to the line circuit to be powered
by said direct current source, two indication re
lays at said mine connected to said ampli?er, a
magnetic ?eld detector unit connected to said
ampli?er to selectively energize said relays ac
cording to a ?rst or a second magnetic ?eld con
dition created by a vessel approaching the mine,
oscillator, means including in series an ener
pled to said oscillator and selectively responsive
to such changes in the ?ow of the indication ‘
current, another office oscillator having a differ
'
WILLARD P. PLACE.
ALFRED B. MILLER.
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