US1240811A - Signaling system. - Google Patents

Description

C. E. BEACH. SLGNALING SYSTEM. APPucATloN FILED ocr. 12. |914.

Patented Sept. 25, 1917.

2 SHEETS-SHEET l.

' l @wal C. E. BEACH. SIGNALING SYSTEM. APPLICATION FILED ocT. I2. I9I4.

Patented Sept; 25, 1917.

LMI I.

2 SHEETS-SHEET 2.

rsinn risica CLARENCE E. BEACH, OF BI-N,Gl'HitlVlI-l(EN,- NEW YORK, ASSIGNOR, :BYv MESNE ASSIGN- MENTS, TO THE GAMEWELL FIRE ALARM '.IFLIEG1 `tAlE-IV COM?ANY, A CORPORATION `OIE" NEW YORK.

magasin Specification ,of Letters Patent.

Patented Sept. 25, 193i 7..

Application med october 12, 19514". l serial No. scema To all whomfz'tmay f concerne' Be it zlmouirthat` I, ,CLARENCE E: BEACH, a citizen ofthe United States, residing at Binghamton, in1 the county of Broome and rtate oi' New Yorflj, llave invented'certain new and usefulImprovements-.in Signaling Systemsyof which the follow-ing' is a speci lication.` i

This4 inventioir relates `to signaling systemsl in which differentwclassesof signals uare transmitted over the saineV circuit, and is* par ticularly adaptedltor' use in connection with municipal police signaling systems, although features of ythis inventionaref adaptedtor use,-either separately or in combination with each other, Witlr various signaling-'1 systems.

An object' oftthislinvention is to provide a signaling systemlhaving a .circuit includ` ing both telegraphic and= telephonie equipment and `'di-rect* current al arm mechanism so connected to the same circuit ythat said alarm mechanism y may be employed Without interL ference between such alarm mechanismand the telf-:graphic andtelephonic equipment.

Another object of thisinvenion is to provide such a system in which the i alarm mechanism is adapted to selectively control or i operate feitherl or both of two sets tof f inde" pendent alarm 4(.levic'es.l

` Anotheri object of this invention is 'to provide a system capable ofsimultaneouslyl signaling alarmsto partor all ofl the circuitsyoli' a common battery system, Without opera-` tively impairing telephonie communication Vthrough-or between such' circuits on account ofthe action', either of groupingfthecircuits, or oftransmittinglsignals thereon.

Another object ofthis invention is'topro` vide al 'form' of such a system which is adapted for use in casesf where"so-called open circuit batteries 1areremployedas `a current source', and it is therefore desiredl to avoid any current `drain Whatever ou the current source except during thetransmission of alarm signals;

Another object of this invention isto provide improved signal formulatingV mechanism adapted to selectively transm'it code signals to 'either orlboth oftwo setsloffalarm mechanisms `in such signaling systems. i

A further object of this"l invention isto provide an* improved i relay orV controlling mechanism specially* adapted to par'allelucom necti'on in a signaling circuit,'and differentially responsive to makes and breaks in a ground or common return connection to either side ot the signaling circuit.

Uther objects are described in the followingI specification' and more particularly pointed out in the claims.

ln lso applying this invention to a signaling system employing a" plurality'ot circuits as to embody allot its features, two current sources are provided, and a* circuit condition ychanging means is connected with one of the current sources so as to be adapted to causev predetermined circuitl condition changesl in all circuits supplied by such source. y

The circuit condition` changing means comprises alarmsignal formulating mechanism,.and alarm selecting mechanism; the formulatiugi mechanism embodying circuit controllers arranged to alternately close two current paths in accordance with any desired code,-a'nd` soarranged* that saidl cu1 'rentf paths are neverboth closed; theselecting mechanism comprising a switch, Whereby'either or both of the circuit controllers of1 the formulating mechanism may berendered eliective, and whereby either of the circuits controlled by: the formulating mechanism may beopened or closed Without operating said mechanism;

A transfer switch isV providedforv each of the signaling circuits, each of these switches 'beiugadapted to connectlits circuitto either current source Without simultaneously disconnecting'said sources, `so that `any circuit 4bet-Ween the `opposite sides of` said circuit.

the telephone stations are in parallel with each other and with the relays, said impedance should comprise suitable inductive reactance.

For establishing telephonie correlation with another circuit a repeating coil is provided,having two substantially equal wind-- ings, one of which is serially included in one side of the circuit, and the other of which-is serially included in the other side of the circuit; Other windings are provided for these repeating coils, and means for connecting such other windings to other circuits, as desired.

Between` each repeating coil and its associated current source transfer switch, re-

lays are provided for controlling signal mechanism.

Each of these relays is provided with two approximately equal windings, one winding of each relay being serially included in one side of its associated circuit, and the other winding being serially included in the other side of said circuit.

Suitable signal receiving or indicating mechanism is controlled by each of these relays. v

The alarm controlling relay mechanism are o f novel form, and each comprises two electromagnets, a terminal of one magnet being connected to one side of the circuit, and a terminal of the other magnet being connected to the other side of said circuit.

The 'remaining terminals of the magnets are connected to a common return conductor, as for instance, to the ground.

An armature structure for these magnets is'so mounted in relation thereto that the energy of one of said magnets will be applied, to the portion of said structure associated with the other of said magnets, duringa portion of the movement of said armature at a leverage which is substantially greater than the leverage at which the energy of such magnet will be applied to said portion during the remainder of the movement of said armature.

A contact/arm is carried by the armature structure whereby circuit connections may be established between either of two sets of contacts, and alarm mechanism is associated with each relay, as for instance, a lamp controlled by one contact, and a bell controlled by the other contact.

For signaling systems in which it is not desired toprovide facilities for transmitting alarm signals on certainf of a plurality of circuits without causing all such circuits ,to be affected by such signals, but one current source need be provided, and the switch mechanism for transferring the various cir- 4cuits from one source to another can be vention may be employed by providing two Y normally. disconnected common return conductors, as for instance, the ground, and a third wire, and connecting one of the magnets ofeach alarm controlling relay between one side of the circuit and one of the common return conductors, as for instance, the third wire, and connecting the other magnet of such relay between the other side of the circuit, and the other common return conductor, as for instance, the ground, keeping, the two common return conductors normally disconnected from each other, and connecting the two 'common return conductors through a condenser, if necessary to secureabsenee of noise in the telephone circuit, and providing facilities for directly connecting such .conductors by 'a lswitch (which may be associated with the circuit condition changing means) whenever it is desired to cause the operation of the alarm relays.

For signaling systems in which it is not necessary to maintain an electrical balance between the circuit conductors and the common return conductor, by connecting one magnet of each alarm relay between one circuit conductor and the common return conductor, and connecting the other magnet of each relay between the other circuit conductor and the common return conductor, provision may be made fory open circuit battery operation by employing a retractile spring, or a permanent magnet, in place of one of the electromagnets in the relay, and connecting the other magnet between one of the circuit conductors and the-common returnconductor, and arranging the relay so that z-when the armature, is in completely retracted position both alarm mechanism circuits will be open; when in partially retracted position, one of the alarm mechanism circuits'will be closed; and when in fully attracted position. the other of the alarm `mechanism circuits will be closed,-

and thus all other features of this invention L :with a yiewofenabling this inventionltofbe better understood, i and.; not as .a ilimitation 4tomy claims.`

4Lilie characters. of reference l, denote similar parts ythroughout i the accompanying Figure ..1` shows` they embodiment of l many features of thisin'vention as Aapplied toa closed telegraphic and ocpenztelephonic circuit signaling system;

- Fig-` 2. showsthefembodiment of many features ofthisinvention as appliedito anormally. open telegraphic `:and f telephonie cirlcuit-signalingsystem, with two common reztu-rnf conductors.;v

Fig. 3 shows certain features ofV this invention -asaappliecl to anorrnally open tele- Agraphic and telephonieA circuit signaling .system, using the ground, or; but. one common returnfconductor; y

fFig. l4 isla plan `View of analarm controlling-relay .adapted for use as shown inFig. l1` and Fig. 2,

Fig. 5 is a sectional View of the relay `shown in Fig. 4, taken on the line f5-5;

Fig. 6 islasectional @View of the relay shown in Fig. 4,5 taken onthe line 6-6;

, Fig? is a View of a modifiedform ofthe :relay showninFig. 4 adapted for use; in the manner indicated in .Fig 13,. and;

Fig.v8 showsa diiferentsformof relay v.mechanism.embodying features of this in- .yenticn Referring-now togFig. 1,` A andzB represent batteries, Awhich are of `such capacity ,-45 .that eithernmay.` supplyfall4 current required for telegraphing, telephoning, Yand alarm :Signaling in;all `of the `circuits `associated therewith.

Switch mechanisms C, D, and Eare pro- 50 yiided, one for each of, the signaling. circuits,

and-each having lswitch arms 1'1A andz12, connected by an insulating yoke 13, @and cooperating .with .separately insulated contacts `114,15, 16md 17.

The contactsl14 and 16zare so' located with `relationto the switch arm 11 thatlin moying` said arm from one contact. to the other,

it willconnect withboth` of said contacts during a lportion of i its movement, andthe :ce contactslv andwl'unaintain a similarrelation with switch arm 12, the yolre113 Vbeing of such length that whilethe arm 11 is touching both contacts 14 `and'l, the arm .12 iwillf touch both contacts' 15.-and 17.

The bus bar.1-8.connects oneterminal of the batteryA with the contacts `16 of each of the switches, ,andthe bus bar 19 likewise connects ,the otherterminal of said battery A with the contacts 17 of each of the switches.

The conductors `20 and 21 similarly connect the terminals of battery B with the contacts114 and 15, respectively, of each of the switches.

`,Circuit condition changing means, consisting of the `alarm `signal formulating mechanism Fa andofthe alarm selecting mechanism G,is associated witlrthe-battery A.

The alarm signal formulating:mechanism F comprises the cylinder'` 31 whichinay be `rotated in any `desired manner, as for instance, by l'suitable clock work of gany well knownfgorm, andhaying one or more teeth or vprojections 32, so :that ;it may be yemployed forany desiredcode signaling.

The contact controllingtracers 33 and 34 aresomounted, with relation toithei-r asso- -ciated Contact points and 36,1espectiyely, `and thetooth or teeth 32,that when the cylginder 31 is rotated around its axis, the

tracers 33` and 34 will be alternately brought into engagement with their contact points :and 36, and so that there will always be .at least'one of said tracers out of contact with its associated Contact` point.

The alarm selecting mechanism `consists of the switch arm 41, permanently connected to the ground, and the free end of :said

fswitch arm comprisestwo prongs, sofas to adapt said switch armiV to make independent contact `upon two contact studs at the same time. The contact studs 42, 43, 44, 45, .and 46 are arranged inthe path of the switch arm `41, thecontacts 44 and 45 being so situated, `that the switcharm 41 may be readily.adjustedwso.that `one of 1its prongs may connect with oneof thesestuds, and the other of itsprongs `with the other.

The lcontact-.stud 43 is connected through the conductor 47 to one terminalv of battery A, contactstud 44 is connected through conductor 48 to tracer` 33, point 35 is connected through conductor 49 to conductor 4T, contact stud is connected,` through conductor `50 4totracer y34, and contact stud l4t is connected `through conductor 51 to point 36 and to the: other terminal of battery A. i

As Vthe arrangement of f corresponding parts is similar in each of the circuits, a detailedxlescription of but one'of these-circuits will be herein given.

The relays H `and I are each provided with-two 4substantially equal windings, one winding of each relay being included in the .conductor 101 leading from switch arm 11,

and the other winding of each relay being cooperatively incl uded ini the conductor 102 leading fromswitch arm 12.

J- is' atypicalmultiple pen register whose pensare separately controlled bythe relays yH in awell known manner, so'asto be reral indicating mechanism.

' A repeating Vcoil is typicallyindicated at L, said coil comprising the windings 61 and 62, serially included in the conductors 101 and 102, respectively, and the windings G3. The intercommunicating switch M is associated with the windings 63 of each repeating coil, these switches being connected to conductors 64 and 65. Such number of telephone and telegraph stations, and relay f mechanisms are connected to the conductors 101 and 102 as may be desired, the manner of connection of the telephone stations being typically indicated at N, and the manner of connection of the telegraph stations being typically indicated at O. One of the relay mechanisms is diagrammatically indicated at P, another relay mechanism .being indicated at Q. 1 i

The relay P comprises the magnets 71 and 72, one terminal of the magnet 71 being connected to the conductor 101 through conductor 73, and one terminal of magnet 72 being connected to conductor 102 through conductor 74. The remaining terminals of magnets 71 and 72 are connected to each other at junction 89, which is connected to the ground through conductor 75.

Beyond the last telegraph station, and preferably beyond the last telephone station or relay mechanism, the conductors 101 and 102 are connected by the inductive impedance R, which is of sufficiently low resistance to normally permit sufficient currentto iiow through conductors 101 and 102 to cause the armature of the relay H associated therewith to move to attracted position, and having suflicient inductive reactance to prevent short-circuiting the alternating telephone current. Y

The magnets of alarm relays, such as P and Q, must be wound to so high a resistance, with relation to the current How at which the relay I-I will retain its associated armature, that the aggregate current iiow through such relay mechanisms will not be sufficient to maintain the armature of said relay II in attracted position when either the conductor 101 or conductor 102 is broken beyond all of said alarm relays, andthe inductive reactance of these magnets must be "sufficient to prevent their acting to shortis such that when the circuit through such station is closed between conductor 101 and conductor 102, the increased current flow resulting therefrom will be suflicient to cause the associated .relay I to move its armature to attracted position. f

The condenser 103 connects the conductors l1 and 102 at a point in said conductors between the repeating coil L andthe relays H and I for lthe purpose of facilitating the passage of alternating i telephone. ,current from the telephone stations through said repeating coil. f

An alarm lamp is typically indicated at S and an alarm bell is typically indicated at T, a suitable source of energy for said lamp and bell being typically indicated at U. Fixed contacts 77 and 78 control the connection of the lamp S with current source U, and fixed contacts 79 and 80 likewise control the alarm bell T. Y

Referring now to Figs.` 4, 5 and 6, which show the construction of relay P infgreater detail, a non-magnetic plate 81 is securedl to the poles 'of the magnets 71 and 72, the poles of said magnets projecting through suitable openings in said plate.

The armature' structure 82 is mounted upon the plate 81 and has the inclined ends 83 and 84 so formed with relation to the magnets 71 and 72 that when the portion of the armature between the bends adjacent to saidk inclined` ends is resting upon the plate 81, the end 83 will incline away` from but extend across the poles of the magnet 71, and the end 84 will incline away Vfrom but extend across the poles of the magnet 72.

"The locating pinsv 85, secured to theplate` 81, pass through suitable openings in the armature structure 82, and are arranged to permit such movement of said armature structure as will bring one or the other of the inclined ends substantially parallel to and against the poles of its associated magnet. When the armature structure 82 moves, in response to the attraction of its end 83 toward the magnet 71, until said end is substantially parallel to and against the poles of said magnet, said armature structure rocks on the bend adjacent to said end 83, and hence during such movement said bend acts as a fulcrum `for said structure, and when the end 84 is moved substantially sov parallel to and against the poles of the vmagl crum, and that when'so rocked theV pull of the magnet upon one of the inclined ends of said structure will have a great advantage over the pulll of the other magnet upon the other end of said structure. be seen that when neither magnet is energized, the armature structure will .be held upon both `fulcrums by the force of gravity, and that the magnets may therefore be energized and denergized without disturbing said armature structure, so long asthepull of one magnet does not exceed the pull of the other magnet by the difference/in advantage which exists when the armature structure is resting upon but one fulcrum, and that whenever the pull of either magnet exceeds said diiierence, such magnet will draw toward its poles the inclined end of the armature structure associated therewith and 'move the other inclined end away from the poles of the other magnet.

It will further be seen that whenever the pull of the two vmagnets becomes substantially equal, after the armature structure has been rocked upon one ulcrum as just described, the superior advantage of the magnet which is acting upon the end of the armature structure which is farthest from its supporting fulcrum, will cause the armature structure to rock upon said fulcrum to the position where itrests upon both fulcrums, where its movement will be arrested through the substantially equal pull of the two magnets, as already explained.

If the relay is to be subjected to such shocks or movement as might cause the armature structure 82 to become disengaged from the pins 85, a guard 86 should be provided to keep such structure `in engagement with said pins.

The contact arm 87 is mounted upon, but insulated from, the armature structure 82, and carries at its free end the movable contact '88 in such position that, when the end 83 is substantially parallel to and against the poles of magnet`71, said bar 88 will connect thefixed terminals 77 and 78, and that when the endr 84 is in like relation to the magnet 72, said bar will connect the iixed terminals 79 and 80. These parts therefore constitutel a circuit controller and on account o governing the operative condition of the alarm devices S and T maybe called alarm controlling mechanism.

An operators set connected to the conductors 6a and 05 is typically shown at V.

The operation of the equipment shown in Fig. 1 is as follows.: j

When ,the enligne C? and E resa It will further upon thei-rcontacts 14C and 15, the current path through the circuit connected to switch .C is as followsf-fr'om one terminal of battery 13V through bus bar` 20, contact 14 and switch arm 11 of switch C, the windings of relays H and l and repeating coil L which are included in conductor 101, impedance R, telegraph station O, the windings of repeating coil L and relays I and H included in conductor 102, switch arm 12 and contact 15 of switch C, and conductor l2,1 tothe other terminal of battery B.

Current paths also exist between conductors 101 and102 through the two magnets ofrelays P and Q in series with each other, but the current flow through these relays is very slight in proportion to the current flow through `the impedance R on account of their high resistance. i

The current 'flow through the windings of relay H is such as to cause the armature of said relay to move to, and remain in, attracted position, 4thereby denergizing the connection between this relay and the register J, but the current `iiow through the windings ot' relay I is insutiicient to cause said relayto attract its armature and thereby close rthe circuit through its associated lamp K. l i j .As the magnets 71 and 72 of each alarm relay are energized to a substantially equal extent, thearmature structure of said relays will be held upon both fulcrums lf the transmitting mechanism at tele` graph stati-on O is now operated, such operation will cause a series of substantially complete breaks in the circuit through conductor V102, corresponding to the notches in thecharacter wheel at saidstatio-n, and upon each ofthese breaks thema guet of relay H will `permit its armature to retract vand close its connection. through register J, and thus cause responsive operation of said register.

If the circuit is closed through telephone station N, such closure will permit sufficient additional current to pass between conductors`101 and 102 to cause the armature of relay I to move to its attracted position and thereby light its associated lamp K.

The telephone call thus indicated may be answered by moving the switch Mto the positionwhich connects the windings (33 of the repeating coil to the conductors 6ft and 05, and then utilizing the operators set V for conversation with the telephone station N.

At the conclusion of the conversation, the switch M should be moved to disconnect the windings 63 from the conductors Gil and 65. and upon breaking the circuit through telephone station N, the armature ofrelay I will move to its retracted position and thereby extinguish its associatedy lamp K., A

1i it is desired to establish telephonie through conductor 102, windings of repeat-V communication between two circuits, as for instance, the 'circuitconnected to switch C and the circuit 4'connected to switch D, this result can be accomplished by moving the switches M of both of said circuits so as 'l to connect their repeating coil windings 63 to the conductors 64 and 65.

If it is desired to transmit a code signal to the alarm bell T, the switch C should be moved so thatl its arms rest upon its contracts 16and 17 and the switch arm 41 should busybar `18, contact 16, arm 11, windings of .relays II and I and repeating coil L inbe'l moved to its Contact 44, and the cylinder 31 rotated so as to suitably influence the j tracerscoperating therewith. Whereupon, 15

35 will provide a connection between the each closure between the tracer 33 and point ground conductor 75 oit' each of the alarm relays' and the terminal of the current source A connected to conductor 47 l During each of such Closures, the' current flow from source A'will be as'follows-from the terminal of said current source which is connected to conductors 18 and 47 various current paths are provided as`followst`- -One path from current source A through cludedin conductor 101, which `path I will term the path through conductor 101; and another path fromisaid terminal of current "source A through conductors 47 and 49,

point 35, tracer 33, `conductor 48, contact 44,

switch arm 41, to the ground, and from the ground `connections 75 at each of the alarm relays through said ground connections to thejunctions 89, which path I will term the ground path,

liromeach junction 89 of the alarm relays,

two current paths are provided, one path 'through its associated magnet 72 and confrom each of said junctions through its asso- "clated magnet 71 and conductor 73 to conductor 101 where this path joins the path through conductor 101, and which path I will term the path through magnets 71. The othery path, from each of said junctions 89 ductor 74 to'the portion of conductor 102 which is between repeating coil L and impedance R, which pathI will term the path through magnets 72.

.Another current path is provided, from conductor v101, through impedance R, to conductor 102, which path I will term the path through impedance R.

A further current path is provided,

ing coil L and relays I and H included therein, switch arm 12, contact 17. and bus bar 19 to the other terminal of current source A.

kFrom the foregoing it will be seen that the current path through magnet 71 is in parallel with the path through magnet 72, but in view of the difference in potential between conductor 101 and conductor 102,

reversed, from the direction in which the current flows through such'magnet when the ground connection is open, and said reversed current owwill ybe very slight, as the fall of potential between the junction 89 and the conductor 101 will only be that due to the difference between'th'e fall of the current iiow through 'magnet 71'willbe i potential resulting from the current ow the current flow through said magnet 72 will b e greatlyincreased. l Y

Inasmuch, therefore., as the current flow through magnet; 71 will not only be very slight but will be in the reverse direction soas to tend to demagnetizejsaid magnet, and as.` the greatly increased current flow through magnet72 will strongly energize said magnet, the`armature structure 82 will move in response tothe attractionof said magnet-72 and connect contactsV 79 and 80l to cause` the operation oi" alarm bell T,

It will further be seen that whenever the ground pathis broken, as by the .separation of tracer 33 from point' 35, the energization of magnets 71 and 72 willbecome equalized, as -the current will thenA flowthrough said magnets in series between conductors 101 and 102, and thus cause armature structure 82 vto move to break the connection between contacts 79 and 80.

Owing to the peculiar arrangement fof the various partsof this system, the changes in the current flow through winding 61 ofV repeating coil L caused by the opening and closing of the ground path will be balanced by exactly opposite changes in thecurrent flow through winding 62 of said coil, and therefore will not cause anycurrent flow to be induced inthe windings 63 of said coil, and the fall of. potential between" concluetors 101 and 102 will not be altered asa result of such opening and closingof the ground path.

If it is desired tosound the alarm bell T i continuously, the switch arm 41 should be moved to its contact 43,`whereupon the terminal el current source A connected to bus bar 18, will beconnected to ground through the conductor 47, contact 43 and switch arm 417 and the other current paths will be thev same as those establishedwhen the tracer 33 was brought into. Contact with point 3 5, and

Laeori rlays to act in response to their magnets 71,

inthesameimanner in which `they acted, in response to their magnets 72, when the switch arm 41 wasconnected tocontact 44.

If it is desired to cause the alarm lamp S to burn continuously, the switch arm 41 should; bc moved into connection with cn tact. 46, whereupon the magnets 71 will be energizedf in like manner.

Lf it is desired to transmit a code signal .toA both the alarm lamp S and the alarm bell` T, the switch arm` 41A should* be moved to, a. position where it connects with' both breaksof theincreased` `current lowithrough contacts 44 and` 45, whereupon the operation oit'V cylinder 31 willi alternately connect the terminals of current source A to the ground path, andv thus alternately cause the armaturestructures ofi the alarm relays to move 1n response to their magnets 71 and 72;

Ifit is desired to operateithecylinder 31 withoutl causing a response of the alarm devices` S-`l and T, the switch arm 411 should be moved tov aposition where it rests uponcontact 42'and does not touch contact 43.

Ifritisdesiredfthat a signal transmitted to some of the circuits shall not` affect the alarm relays. of other circuits, the transfer switches of thecircuits which itl is desired to have responsive to such alarm; signal: shouldrest upon their contacts 16 and 17,

and` the. transfer. switches-off` the circuits. which` 1t is desired? toihave unresponsive t0,

such. alarm signalf should `rest uponv theircontacts 14 and 15.

It willi be noted that. the makes-` and telephone station. N, will; not operatively afA feet; the, alarm relayslfand: QJ, as all' such changes. will allect.A both magnets` of)` each relay to\ a substantially corresponding eX- tent.

It will also be= noted that iff there are a considerable number of= alarm relays4 connected across the circuit, and a seriesztele-` graph station located between. the relay nearest to the. current source anch the other relays4 is operated, the operation` of such` telegraph; station would unbalance all of the relays, and would imbalance` the relay` between the current: source and. such telegraph station to` an,` extent which might be suflicient tocause the operation 'of said vre-V lay, butin practice, the signals of such telegraphic stationsv may betransmittedby the use offbrealrs.` which are .sof short, with relation to the closed'y circuit periods of such telegraph signals, that such alarm relay would not beoperatively a'ccted. How

ever, should' the conductor 101 or the conductor 102 be broken at such a point that there was` a` materially greater number of alarm relays at the side ci the break vl'arthest from the current source, the alarm relaysbetween such break and the current sourcemight be operatively affected during the continuance of the break.

It it is desired to avoid a continuous alarm` in the event of such a break, there must be no permanent metallic connection between conductors 101 and 102 outside of the; central oflice, and therefore thc telegraph stations should be of the normally open circuit type and be connected in parallel# between said conductors, and the impedance R should be omitted, while two common return conductors may be provided (arranged, :tor example, as shown in Fig, 2)., or one common return conductor may be provided and single electromagnet relays may beemployed, as indicated in Fig. 3.

Fig. 2 lshows certain features of' my in vention applied to a system similar to that show-nf` in Fig: 1 except as follows:

Only.V one circuit and one current source is shown in Fig. 2, although it is evident that this systemiisadapted for common bat tery operation with other circuits, and with two current sources and transfer switches, as shown in Fig.I 1.

The impedance R' is omitted, the telegraph stations are connected in parallel between conductors 101 and 102', and instead of connecting a terminal of the magnet '71. and a terminal of the magnet 72 of each ala-rm relay to a common return ground, the corresponding terminal of one magnet only (as magnet 72) is connected to the ground, and the terminal of the other magnet (as magnet 71)` is connected to the common return conductor 104.

At headquarters the common return conductor 104 is connected` to contact 90 of switch-VV, whereby said conductor 104` may be directly connected to. the ground` whenever it is desired'to transmit an alarm signal.

fr condenser 105 may be permanently connccted between the conductor 104 and the ground, so as-to substantially balance the conductors101 and 102it as tar astelephone conversation 1s concerned.

In view oflthe fact that the embodiment oithis invention shown inFig. 2 comprises normally open circuit, parallel connection telegraph stations, t-he connection provided l'roni` relay H 'for register J is appliedto theV front or closed-circuit contact of said relay.

rllhe current path through the contacts of tlierelay..l is controlledlby the back ornerswitches M 'could be interposed between said mally open circuit contact of the relay H', so that the line lamp K, will not be rendered operativev upon closures of a telegraph station, but will be rendered operative only as a result of current increases due to the establishment of a current path through a telephone station. The relays H and T are so adjusted that the current How, upon the establishment of a current path through a telephone station, will cause the armature of relay .l to move to attracted position but will not cause the armature 'of relay H to so move, while a `practical shortecircuit between the conductors 101 and 102', as through the closing of the normally open contacts at a telegraph station, will cause thearmatures of both relays H and I to more to attracted position.

The operators set V is directly connected to the windings 63 of repeating coil L but if a plurality of circuits were employed, the

operators set and said windings 63, as shown in F ig. 1.

The operation of theequipmcnt shown in F ig. 2 is as follows:

When the switch W is resting upon its normally open contact 91, and the telegraph and telephone stations are not in use, no current will flow from the battery A, and the relays H and I and the magnets of the alarm relays P and Q will not be ener-k gized.

If the transmitting mechanism at telegraph station O is now operated, such operation will cause a series of closures, each 1 cause the operation of their alarm bells T.

establishing a short ciicuit between conductors 101 and 102, and corresponding to the teeth on the character wheel at said station. Upon each of these closures the armatures of relays H and l will more to attracted position, the armature of relay H closing` its register connection, and thus causing re sponsive operation of saidv register, and breaking the connection through the contacts of relay I so as not to cause the lighting of the associated lamp K.

1f the circuit is closed through tele hone station N, such closure will permit su cient current to pass between conductors 101 and 102 to cause the armature of relay I to move to its attracted position and thereby light its associated lamp K, but such current will be insufficient to cause the magnet of relay H to` move its armature to attracted position.

A telephone call thus indicated may be answered by utilizing the operators set V and, upon breaking the circuit through telephone station N at the conclusion of the conversation, the armature of relay T will move to its retracted position and thereby eX- tinguish its associated lamp K.

If it is desired t0 transmit a code signal to the alarm bell T, the switch W should be moved so that its armwill rest upon contact 90, and the switch arm 41 should be moved to its contact 44 and theytracers 33 and 34 suitably influenced, whereupon each closure between the tracer 33 and point 35 will provide a connection betweeny the common'return conductor 104 and the ground conduc tor of each of thealarm relaysand thc During each of the closures between tracer r 33 and point 35, the current will flow through paths corresponding to those described for like closures in connection with Fig. 1 (exceptthat in 2, the switch W corresponds with the junction 89 of Fig.y 1),

and therefore the current flow through the y magnets` 71 will be very slight and in re verse direction, so as to tend to demagnetize said magnets, and the current How through the magnets 72` will be greatly increased so as to strongly energize said magnets, and the armature structures 82-ofsaid relays will thus be caused to move, in response to the attraction of said magnets72, and connect their associated contacts 79 and 80 to Itwill furthermore be seen that the makes and breaks `in the common return paths shown in Fig. 2 will have'the saine effect as tained, whereby the changes in the current iiow through winding 61 of repeating coil L', caused by such makes and breaks, will be balanced by exactly opposite changes in the current flow through winding 62 of said coil, and therefore will not cause any current iiow to -bey induced in the windings 63 thereof, and the fall of potential between conductors 101v and 102 'will not be altered as a result of such opening and closing of such common return paths.

If it is desired to sound the alarm bell T continuously, the switch arm 41 should be moved to its contact 43, when the results will be the same as from the corresponding.

operation of the switch arm 41 of Fig. l.

If it is desired to transmit a code signal to the alarm lamp S, the` switch arm 41 should be moved to its contact 45, and the tracers 33 and 34 suitably influenced, whereupon each closure between the tracer 34 and point .36 will provide atconnection between iso through paths corresponding to those de' scribed for like closures in connection with F ig. ,1, and therefore the current flow through the magnets 7 2 will be very slight, and in reverse direction so as totend to de- 4magnetize said magnets,` and the current flow through the magnets 71 will be greatly increased so as to strongly energize said magnets, and the armaturestructures 82 of said relays will thus be caused to move, in response to said magnets 71, and connect their associated Contacts 77 and 78 to cause the operation of their alarm lamps S.

It will be noted that `the makes and breaks of the increased current flow, incident to the use of a telephone station, will not operatively `affect the alarm relays 13 and Q', as all such changes will affect both magnets of each relay to a substantiallyV corresponding extent if the circuit through switch "W is closed, and will not operatively affect such magnets if said switch is open.H It` will also be noticed that so long as switch W isopen and no telegraphic or' telephonie stations are in use, none of the alarm relays will act in` response to any break in either the conductor 101 or the conductor 102. Howeven if during such `a break a closurewas established through a telephone or telegraph station farther from the current source in the circuit than such break, part or all of the alarm relays might act in response to suchbreak during the continuance'of such closure.

lIf a telegraph or telephone station is operated whilethe alarm relays are in either of their signaling positions, the `closures produced by such telegraph or telephone sta-- tion will decrease the current flow through the effective magnets thereof by increasing the fall of potential across the winding of the relays H and I and the repeating coil L in series therewith, due to the additional iiow of current therethrough, but such decrease will be insuiiicient to operatively affect said alarm relays, and in the instance of the operation of atelegraphstation such closures should be extremely short with relation to the open circuit periods ofthe signals transmitted. j

Fig. 3 shows certain features of my invention applied to a" system similar to that shown in Fig. 2 except as follows:

Only one electromagnet is provided at each alarm relay, these magnets all'being connected between oneof the line conductors (as conductor 102) and the common return ground. j

At headquarter`s`,l` the conductor 51, instead of being connected to the terminal of the battery A to whichrconductor 102 is connected, is connected at such an intermediate point in said battery that the fall of potential `between said point and said terminal, is sufficient to operate the alarm relays for one step, but is insufficient to operate said relays for two steps, as will be hereinafter more fully explained.

rihe construction ofthe relays, shown in connection with` F ig. 3, is shown in greater detail in Fig. 7, in which it` will be noted that the armature structure 82 is mounted in a manner similar to that shown in Figs. 4, 5 and 6, `and electromagnet 72 is mounted in suitable relation to the inclined end 84 of said structure, while means is provided for movingsaid end 84 away from said magnet 72, consisting of a spring 92 applied to the-inclinedend 83 of said armature structure.

A movable contact 88 is carried by the Contact `arm 87, moving with the armature structure 82, and the fixed contacts 79 and 80 are `so mounted in the path of said movablecontact 88 that when the inclined end 84 of armature structure 82 is moved substantially parallel to and against the poles of electromagnet 72, said contacts 79 and 80 will be connected by the contact 88.

The fixed contacts 77 and 78 are so mounted, in the path of the movable contact 88', that when the armature structure 82 is resting upon both of its fulcrums, said contacts 77 and 78 will be connected by the contact 88 but when said armature structure 82 is ina position where either: inclined? end'` thereof `is substantially parallel j to the plate 81, said Contact 88 will not connect said contacts 77 and 78.

The strength of the spring 92 is such that when the magnet 72 is denergized the armature structure will rock upon the fulcrum adjacent to its inclined end 83 until said end is moved substantially parallel to and against the plate 81', and such that when said magnet 7 2 is energized by a current flow such as will pass therethrough when conductor i17 is connected to ground (see Fig. 3), the pull of Vsaid magnet 72 uponv theinclined end 811 of said structure 82 will cause said structure to first rock upon the fulcrum adjacent to its inclined end 83 until it rests uponboth fulcrums, and to thereafterrock` upon the fulcrum adjacent to its inclinedfend 84,- until such inclined end is substantiallyparallel to and against the poles of said magnet 72.

Owing tothe fact that the pull of the magnet 72 operates at muchgreater advantage, against spring 92, when the armature structure 82 is rocking uponthe fulcrumadjacent toits end 88', than when said structure is rocking upon the fulcrum adjacent 'toits end 841, it is evident that a much weaker current flow through the magnet 72, will move said armature structure, from the position where its end 83 is substantially parallel to and against the plate 81', to the position where said structure rests upon both of its fulcrums, than the current required to move said armature structure, from the position where yit rests upon both ,of its fulcrums, to theposition where4 its inclined end 84 is substantially parallel to and against the poles of the magnet 72". lAnd in practice it has been found that if the conductor 51 is connected midway between the terminals of the battery- A, such a relay as that shown in Fig. 7 may be adjusted so that it will operate, without readjustment, through widely differing circuit and battery conditions.

The operation of the equipment shownin Fig. 3 is as follows:

Vhen the switch arm `41 is resting upon its normally open contact 42, and the telegraphic andtelephonic stations are not 1n use, no current will How from the source A, and hence the relays H and I, and the magnets' 72 of the alarm relays P and Q, will not be energized, and the armature structures of the relays P and Q will be held in such position by their springs 92 that their associated movable contacts 88 will not connect any of their fixed contacts.

The results of operation and use of telegraph and telephone stations shown yin Fig. 3 correspond with Fig. 2.

i If it is desired to transmit a code signal to the alarm bell T, the switch arm 41 should be moved to its contact 44, and the tracers 33 and 34 suitably influenced, whereupon each closure between tracer 33 and point 35 will provide connection between the ground terminals of the relays Q and P and the terminal of the battery Al connected to conductor 47.

During each of the closures between tracer 33 and point 35, the current will flow through the following path:

From the terminal of battery A connected to conductor 101, through conductors 47 and 49, point 35, tracer 33, contact 44, switch arm 41 to the ground, and from the ground connection of each alarm relay, through the magnets 72-of such relay, conductor 74, conductor 102 and the windings of repeating coil L and relays I and H included/therein, to the other terminal of battery A and the resultant current flow through the magnets 72 will be comparatively great, as each'of these magnets is thus connected across the entire battery A, with only the resistance of the ground path and the path through conductor 102" in series therewith, and therefore the armature structures 82 of said relays will be caused to move to the position where their associated contacts S8 will connect their coperating contacts 79 and A80', and thuscause vtheir alarm bells T .to sound. v

The various parts of Fig. 3 do not maintain the peculiar arangement, shown in Figs. 1 and 2, whereby changes inthe current flow through one winding of the repeating coil caused by makes and breaks in the common` return paths shown byfsaidV iigures will be balanced by exactly opposite changes in the current flow through the other winding of the repeating coil, and therefore a current How will be induced in the windings 63 of the repeating coil L shown in Fig. 3and the fall of potential betweenV the conductors 101 and 102 of said figure will be somewhat altered, as a result .of such opening and closing of the ground path.

If it is desired to sound the alarm bell T continuously, the switch arm 41 should be moved to its contact 43, when the result will be the same as when the tracer 33 is in contact with the point 35 when the switch arm is resting upon contact 44.

It will be noted that the makes and breaks of the increased current flow incident to the use of a telephone station will not operatively affect the alarm relays AP and Q, as the only influence of such current changes, upon the magnets of these relays, will be to slightly alter the fall of potential across `Vthe wind ings of the relays H and I and the repeating coil winding 62Vincluded in the conductor If it is desired to transmit a code. signal to the alarm lamp S, the switch arm 41 should be moved to its contactA 4,5, andthe tracers 33 and 34 suitably influenced, where-V upon each closure, between the tracer 34 and point 36, will providea Vconnection between the grounded terminals of each of the alarm relaysand the point inthe battery A to which the conductor 51`is connected. During each of these closures the current will flow 'throughthe' magnets 72 of the alarmrelays and back to the other terminal of the battery A, through the path described "in connection with the transmission of code signals when the switch arm 41 was described as resting upon the contact 44. This current How will be substantially less than the flow when the switch arm 41 was resting upon either cont-act 43 or contact 44, as the magnets 72" are now each connected across one Ihalf ofthe battery A, with the resistance of the ground path and the path through conductor 102 inseries therewith. The armature structures 82 of said relays will therefore be caused to move only to the position where said structures rest upon both of their f,ulcrums,v and their associated contacts 88 will then connect their coperating contacts` 77 and 7 8, and kthus cause operation of their alarm lamps S.

S continuously, the switch arm 41 should be moved to its Contact 46, when the current flow and position assumed by the armature structures of the alarm relays will be the same as during closures between tracer 34 and point 36 when the switch arm is resting upon contact 45.

If it is desired to transmit a code signal to both the alarm lamps S and the alarm bells T, the switch arm 4l should be moved to a position where it connectsthe contacts 44 and 45, and the tracers 33 and 34 suitably influenced, whereupon each of the closures between said tracers and contact points will provide a connection and cause a response ofthe alarm relays such as already described.

The closure of the current path through a telephone station will not prevent the described operations of the alarm relays, as such closure, `while increasing the current flow, through the windings of relays'H and I and winding 62 of repeating coil L', so as to increase the fall of potential across said windings, will not increase said fall oflpotential' to an extent which will leave an insuihcient fall of potential, across the magnets 72*l of the alarm relays, to cause the intended response thereof.

Vhile the operation of a telegraph station will greatly increase the current flow, through the windings of relays H and I and winding G2 of repeating coil L in `icluded in conductor 102, during the closures incident to the operation of such station, and thereby greatly increase the fall of potential across the terminals of said windings,-in practice, the signals of such telegraph station may be transmitted by the use of closures which are so short, with relation to the ope-n circuit periods of such telegraph signals, that the alarm relays will not be operatively aected thereby.

It will be seen that, with the various parts arranged as shown in Fig. 3, none of the alarm relays will act in response to any break in either the conductor 101 or the conductor 102". However, if durino such a break a closure was established through a telephone or telegraph station fartherfrom the current source in the circuit than such break, part or all of the alarm relays might act in response to such a break during the continuance of such a closure.

lt is evident that a wire conductor may be employed in the place of the ground connection between the switch arm 4l and the conductors 75.

\ ln employing the particular embodiment of the features of this invention shown in Figs. 2 andA 3, it is necessary to limit the number of alarm relays to one which will pass a currentinsuiiicient to cause the relay I toV act to close its circuit.

Fig. S shows ai form ofrelay so embody-` ing certain features of this inventiom-that" said relay may be used in the place of the relay shown in Figs. l, 2, 4, 5, and 6. Or by substituting a spring (such as the spring 92 shown in Fig. 7) or a permanent magnet for one of the electromagnets shown in Fig. 8, the relay shown in said figure may be used in place of the relays shown in Figs. 3 and 7.

In constructing the relay shown in Fig. 8, electromagnets 71 and 72 are suitably mounted, and an armature structure is provided therefor, consisting of the inclined ends 83 and S4, pivoted at 203 and 204, and carrying the armatures 201 and 202, respectively.

The springs 205 and 20G are connected to the inclined ends S3 and '84, respectively, in such manner as to tend to move said ends toward the magnets 71 and 72.

The strut plate 81 passes between the inclined ends 83 and 84, and is provided with the locating pins S5 extending through suitable openings in the inclined ends 83 andv84.

As the transmission of motion, from the inclined end S3`to the inclined end 84, through the plate S1 is similar to the corresponding transmission between inclined end S3 and inclined end 84 in Figs. 4, 5, and G, the points of engagement between thc inclined ends `83 and 84 and the plate 81 are, for want of a better term,` hereinV called fulcrums.

The fulcrums are so positioned as to hold the inclined ends 83 and S4 a suitable dista-nce from their coperating magnets.

When the armature structure moves, in response to the atraction of the inclined end 84, toivard the magnet 72 until the armature 202 is substantially parallel to and against the poles of said magnet, said inclined end 84 rocks onthe corner of the plate Si adjacent to the free end of said inclined end S4, and the inclined end 88 rocks on the corner of the plate 81 adjacent to the pivoted end of said inclined end 83, and hence during said movement said corners act as a fulcrum for said structure, and when the armature structure is moved, in response to thc attraction of the inclined end 88, toward the magnet 71 until the armature 201 is substantially parallel to and against the poles of said magnet, the corner' of the plate 81 adjacent to the free end of said inclined end 83, and the corner of said plate 81 adjacent to the pivoted end of the end 84, act as a ful'crum for said structure.

lt will therefore be seen that two fulcrums are soprovided that this armature structure is adapted to rock upon either fulcruin, and that when so rocked the pull of ainagnet upon one of the inclined ends of said structurewill have a great advantage overthe pull of the other magnet upon the other 'end of said structure. 1t will -further be seen that when neither magnet is energized, the armature structure will be held upon both fulcrums by the action of the springs 205 and 206, and that the magnets may therefore be energized and denergized without disturbing said armature structure, so long as the pull of one magnet does not exceed the pull of the other magnet by the difference in advantage which exists when the armature structure is resting upon but one fulcrum, and that whenever the pull of either magnet exceeds said difference, such magnet will draw toward its poles the end of the structure associated therewith and move the other end away from the poles of the other magnet.

It will further be seen that whenever the lpull of the two magnets becomes substantially equal, after the armature structure has been rocked upon one fulcrum, as just described, the superior' advantage of the magnet which is acting upon the end whose supporting fulcrum is nearest to its pivot, will cause said armature structure to rock upon said :tulcrum to the position where both fulcrums become eiiective, where the movement of said structure ywill be arrested through the substantially equal pull of both magnets and both springs, as already explained.

The ends S3 and Si may be connected to one 'conductor of the current source U (see F ig. 1) and thus form an operative equivalent to contacts 77 and 79, and the contacts 78V and 80l may be connected to the lamp S and bell T so that said lamp and bell will be controlled as shown in Fig. l.

Having now fully described this invention, what I claim and desire to secure by Letters APatent of the United States is:

l. In an electric signaling system: two current sources; a plurality of signaling circuits each having connected thereto,-switch mechanism for connecting said circuit to either current source without simultaneously disconnecting said sources, telegraphic signal receiving mechanism,telephonic signal indicating mechanism, one or more telegraphic transmitting stations, one or more telephone stations, relay mechanism adapted to operatively affect certain alarm receiving or indicating devices upon a predetermined change in the condition of said circuit and to operatively affect other alarm receiving` or indicating devices upon a different predetermined change in the condition of said circuit, and means :tor establishing telephonic correlation with another circuit;

circuit condition changing means associated with one of said current sources and adapted to cause said predetermined changes in the condition of circuits connected to said source; and conductors between said mechanisms and stations and said circuit c ondltion changing means whereby said circuit condition changeswill operatively affect said relay mechanism but will not operatively aii'ect the transmission of telegraphic signals or telephonic communicationsnin said circuits.

2. In an electric signaling system: two current sources; a plurality Vof signaling circuits each having connected thereto,-switch mechanism for connecting said circuit to either current source without simultaneously disconnecting said sources, telegraphic signal receiving mechanism, telephonic signal indicating mechanism, one Vor more telegraphic transmitting stations, one or more telephone stations, relay mechanismadapted to operatively affect certain alarm receiving or indicating devices upon a predetermined change in the condition of said circuit and to operatively alect other alarm receiving or indicating devicesgupon a dilierent predetermined change in the condition olf-said circuit, and means orestablishing telephonic correlation with `another circuit.; alarm signal formulating mechanism associated with one of said currentjsources;

alarm selecting mechanism adapted to control said alarm signal formulating mechanism to cause either or'both of said predetermined changes in the condition of circuits connected to said source; and conductors between said mechanisms and stations whereby said circuit condition` changes will operatively affect said relay mechanism but will not operatively aect the transmission lof telegraphic signals or telephonic communications in said circuits. y

, 3. In an electric signaling system: two current sources; circuit condition changing means associated with one of said `current sources and Aadapted to causea predetermined change in the condition of circuits connected to said source; a plurality of signaling circuits each having connect-ed thereto,-.-switch mechanism for connecting said circuit to either current source kwithout simultaneously disconnecting said sources, telegraphic signal receiving mechanism, telephonic vsignal indicating mechanism, one or more telegraphic transmitting stations, one or more 4telephone stations, and oneor more relay mechanisms each adapted to operatively aect alarm 4receiving or indicating devices when said circuit is connected to the current e source vhaving said circuit condition changing-means associated with it and said circuit condition changingmeans is operated; and conductorsbetween all of said mechanisms, stations, and said circuit condition changing `means whereby the operation of said circuit condition changing-means will not operatively aiiect the transmission of Atelegraphic signals or telephonic communications in any of said circuits. i i

rse

4; In an electric signaling system: two current sources; circuit condition changing means associated with one of said ucurrent sources and adapted to1 cause a predetermined .change in the-condition ofcircuits connected to said source; a plurality of signaling circuits eachhaving connected thereto,-switch mechanism for connecting said circuit to either current source without simultaneously disconnecting said sources, telegraphic signal receiving mechanism, telephonie signal indicating4 mechanism, one or more telegraphic transmitting stations, one or more telephone stations, one or more relay mechanisms each constructed and arranged to operatively alect alarm receiving or indicating devices when said circuit is connected to the current source having said circuit condition changing-means associated with it and said circuit condition changingmeans is operated,I and, means for establishing telephonie correlation with another circuit; land conductors' between all of said mechanisms, stations, and said eircuitcondition changingA means whereby the operation of said circuit condition changingmeans will not roperatively affect `the transmissionof telegraphic signals ortelephonic communications in any of said circuits.V

5. In an electricV signaling` system: two

Acurrent sources; circuit condition changing means associated with one of said current sources and adapted to cause a predetermined changein the condition ofcircuits connected to said source; a plurality of signaling 'circuits each having connected thereto,- switch mechanismor connecting said circuit `to either current source without simultaneously `disconnecting 4 said sources, telegraphic signal i receiving mechanism, telephonie signal indicating mechanism, one or moretelegraphic transmitting stations, one-or more telephone stationseach having a central energy telephone set, one-or more relay mechanisms each constructed and arranged to operatively aiect alarm receiving or indicating` devices when? said circuit' is connected tothe current't source having said circuit condition changing-means associated with it and said circuit conditionV changingmeans isV operated, and means for establishingtelephonic correlation with another circuit; and conductors between all of A said mechanisms, stations, vand sai'd circuit condition changingmeans whereby the operation of said circuit condition changingmeansl will not operatively affect -the transmission of `telegraphic signals or -telephonic communication in any of said circuits. y

i 6.Y ln an `electric signalingfsystem, `the combination of a-'plurality of signaling-circuitsA leading from a central station, two

current sour-ces therefor, telegraph-transmitting stations, `telephone stations, relaymechanism with assoclated alarm-mechal nism arranged in said circuits, telegraphic signal-receiving mechanism, and telephonie signal-indicating mechanism at the central station responsive to the telegraph-transmitting stations and telephone'A stations in said circuits, a circuit condition changingmeans at the central-station for the relay mechanisms, associated with one of the current sources only, separate switches for connecting the signaling circuits with either current source to the exclusion ofthe other, and when connected with the current source with which said circuit condition changingmeans` is associated, will cause responsive operation'of .the relay mechanism and its associated alarm mechanism in the circuit or` circuits so connected upon operation of the circuit condition changing-means therefor, and the other signaling circuits will not be controlled by the operation of the circuit condition changing-means.

7. In an electric signaling-circuit, a current source, telegraphic signal-receiving and telephonic signal-indicating mechanism at a central station, twoconductors connecting inseries lsaid, mechanisms and said current source and extending from said station,and including beyond said station, one or more telegraphic transmitting-stations, one or more telephone stations, and one or more relaymechanisms, each adapted to control oneyor more alarm-receiving or 1ndicati-ng devices, a third conductor connected to the relay-mechanisms, and movable meansfat thecentral station to `connect said third conductor with a terminal of the current' source, whereby the relay-mechanism is caused to respond.

8. In an electric signaling circuit: a current source; one or more telegraphic transmittingstations; one or more telephone stations one or more relay mechanisms each adapted to control one or more alarm receivingorindicatingdevices; two parallel conductors' connecting the current source, all of said stations, and relay mechanisms, and telegraphic signal receivingand telephonie signalfindicating i mechanism i serially included inthe circuit between `said current source and theparallel `connections to all of said stations `and relay mechanisms; a third conductor permanently connected to each relay mechanism; and movable means for connecting said third conductor to a 'terminal of the currentsource, whereby the relay-mechanism is caused tol respond;l

9. Inan electric signaling circuit: a current source; one or more telegraphic transmitting. stations; one or more telephone stations; one or more` relay mechanisms each adapted to control one or `more alarm receiving or indicating devices; two parallel conductors connecting the current source, allot said stations, and relay mechanis1ns,-and telegraphie signal receiving and telephonie whereby the'relay-mechanism'is caused to 60 Y 2 telegraphic signal receiving and telephonie signal indicating mechanism, including an inductive reactance, serially included 1n c1r# cuit between said current source and .the parallel connections to all of said stations and relay mechanisms; a third conductor permanently connected to each relay mechanism; and movable means for connecting said third conductor to a terminal of the current source, whereby the relay-,mechanism is caused to respond.

10. In an electric signaling circuit: a current source; one or more telegraphie transmitting stations; oneor more telephone stations; one or more relay mechanisms ca ch adapted to control one or more alarm receive ing or indicating devices; two' conductors connecting in parallel the current source, all of said stations, and relay mechanisms,v-and each serially including telegraphic signal receivingr and telephonie signal" indicating mechanism betweenV said current source and the parallel connections' to all of said stations and relay mechanisms; a repeating coil having one winding connected in series 1n one of said two conductorsy and another winding connected in seriesin the other of said two conductors, between the telegraphic and telephone signal mechanism and all oi said stations and relay mechanisms; a third conductor connected to each relay mechanism; and means for connecting said third conductor to a terminal ofthe current source. l1. In an electric signaling circuit: a current source; one or more telegraphic trans'- mitting stations; one or more telephone stations; one or more relay mechanisms each adapted to control one or more alarm receiving or indicatingdevices; two parallel conductors connecting the current source, all of said stations, and relay mechanisms,'-and telegraphic signal receiving and telephonie signal indicating mechanism serially ineluded in circuit between said current source and the parallel connections to all of said stations and relay mechanisms; a third conductor permanently connectedy to each relay mechanism at a point, electrically, about midway between said two conductors; and

` movable means for connecting said third conductor to a'terminal of the current source,

respond. e

12. Inan electric signaling circuit: a current source; one or more telegraphic transmitting stations; onel or more telephone stations; one or more relay mechanisms each adapted to control one vor more alarm receive ing or indicating devices; `two parallel conductors connecting the current source, all of said stations, and relay mechanisms,and

signal indicating mechanism, including an inductive reactance, serially included in circuit between said current source andthe parallel connections to all ofsaid stations and relay mechanism; a third conductor permanently connectedA to `each relay mechanism, at a point, electrically, aboutmidway between said two' conductors; and movable means for connecting said third conductor to a terminal of the current source, whereby the relay-mechanism is'caused to'respond.

13. In a signaling mechanismytwo magnets, armature structureA so mounted with relation to said magnets as` to be operatively unaffected by substantially equivalent energization of both of said magnets, and alarm controlling mechanism operatively atected by said structure only uponand during a predetermined excess energization of a cer` tain one of said magnets. '14.k In a signaling mechanism; two magnets, armature structure so' mounted with relation to said magnets as to be operatively unaffected by substantially equivalent energization of both of said magnets,alarm con-y trolling mechanism operatively aiected by said structure only upon and vduring a predetermined excess energization of a certain one of said magnets, and other alarmcontrolling mechanism similarly affected 'only upon and during a predetermined excess energization of the other ofsaid magnets.V 15. A signaling circuit comprising two conductors; a common return conductor; Vrelay mechanism comprising two electromagnets each having a terminal connected to said circuit and a terminal connected to the common return conductor; an armature structure so mounted withrelation to said magnets as to be operativelyl unaffected by substantiallyL equivalent "energization' of both of said magnets; alarm controlling mechanism operatively affected by said structure only uponra predetermined excess magnets; conductors connecting 4the independent terminals of said magnets; a currentsource between said conductors;` and means for connecting either Vof said conductorsv with all of said `common terminals'. 17. A current source; circuit conductors connected to theterminals of saidcurrent source a common return conductor; signal formulating mechanism comprising two circuit controllers, one connected to one .terf

minal oi' the current source and the other connected to the other terminal ot the current source, and means for alternately closing,` said circuit controllers, so arranged that there is no time during` which both ot said circuit controllers are closed, and; means for connecting the common return conductor to one or the other terminal of the current source or to either or both of said circuit controllers.

18. A current source; circuit conductors connected to the terminals of said current source; a common return conductor; signal formulating` mechanism comprising two circuit controllers, one connected to one ter minal of the current source and the other connected to the other terminal of the current source, and means for alternately closingsaid circuit controllers, so arranged that there is no time during which both of said circuit controllers are closed, and; means for connecting the. common return conductor to one or the other terminal of the current source or to either or both of said circuit controllers, or to an open contact.

19. A current source; circuit conductors connected to the terminals of said current source; a common return conductor; signal formulating mechanism comprising,` two circuit controllers, one connected to one terminal of the current source and the other connected to the other terminal of the current source, and means for alternately clos ing, said circuit controllers, so arranged that there is no time during which both of said circuit controllers are closed, and; a switch having a plurality of contacts, one being connected to one circuit controller, another to the other circuit controller, another to one terminal of the current source, another to the other terminal of the current source, and another being open, the common contacting member of said switch being,` connected to the common return conductor.

20. A current source; circuit conductors connected to the terminals of said current source; a common return conductor; signal formulating mechanism comprising two circuit controllers, one connected to one terminal of the current source and the other connected to the other terminal of the current source, and means for alternately closing` said circuit controllers, so arranged that there is no time during which both of said circuit controllers are closed, and; a switchhaving a plurality of contacts, one being connected to one circuit controller, another to the other circuit controller, another to one terminal of the current source, another to the other terminal of the current source, and another being` open, the common contacting` member of said switch being connected to the common return conductor, said switch being arranged to permit contact of the common contacting inember with both of the circuit controller con tacts at one time.

ln witness whereof, I hereunto subscribe my name, this 10th day of October, A. D.,

C. E. BEACH. lVitnesses M. L. THOMAS, R. C. PALMATIER.

Copies of this patent may be obtained for ive cents each, by addressing the Commissioner of Patents Washington, D. C.

Images