US1206761A - Telephone systems. - Google Patents

Description

R. 0.1M. HASTINGS.

E I TELEPHONE SYSTEM. APPLICATION FILED APR. 11. I912- RENEWED AUG. 20 1913- 1,206,761. PatentedNov. 28, 1916.

' 4 SHEETSSHEET 1- v 35mm? EN AttorrEexg R. c. M. HASTINGS.

TELEPHONE SYSTEM.

APPLICATION HLED APR. 11, I912- RENEWED AUG- 20, 1913.

Patented Nov. 28, 1916.

4 SHEETS-SHEET 2.

Attorneys R. C. M. HASTINGS.

TELEPHONE SYSTEM.

APPLICATION FILED APRLJI, r912. RENEWED AUG-20,19I3.

1,206,761. Patented Nov. 28, 1916.

4 SHEETSSHEET 3- Witnesses a lnve ntor; 2 v y Atto rn ys R. c'. M. HAST|NGS.

TELEPHONE SYSTEM. APPLICATION FILED APR. II, 1912. RENEWED AUG. 20.1913.

1,206,761 Patented Nov. 28,1916.

Attorneys UNITED STATES PATENTOFFICE.

REUBEN C. M. HASTINGS, OF COLUMBUS, OHIO, ASSIGINOR TO INTERNATIONAL TELEPHONE 00., 0F COLUMBUS, OHIO.

TELEPHONE SYSTEM.

Specification of Letters Iatent Application filedApril 11, 1912, Serial No. 690,014. Renewed August 20, 1913. Serial No. 785,818.

To all whom it may concern Be it known that I, REUBEN C. M. HAs'r- INGS, a citizen of the United-States, residing at Columbus, in the county of Franklin and vState of Ohio, have invented a new-and use- 'moval of the receiver from the hook or the taking down of the jack plug opening the bell circuit and cutting out the ringing circuit.

A further object of the present invention is the provision of an automatic ringing device, which will employ a simple form of alarm, such as a low resistance electric bell or buzzer, and whereby the coils of the magnet therein in all of the various subscribers sets will be of small resistance so that a predetermined battery force will properly actuate such alarm, said battery being furnished from central station or from the battery used in the instrument called.

A still further object of the invention is the provision of a means whereby the automatic ringing device will be energized by means of the introduction of a jack plug into a socket at the exchange, the introduction of. such jack plug operating a selecting. device in the various subscribers sets to throw in line the selected called subscribers set and actuate the alarm therein, while the ringing devices in the various other subscribers sets will be cut out as well as their complete sets, the present apparatus being especially designed f r use in connection with the regular telephone system as 'now installed, either with a series circuit or a loop circuit, or it may be used in connection with a selecting key and the system as illustrated in the application filed August 29, 1911, Serial No. 646,697 covering a. selective system of I telephony.

have a battery for operation that can be connected to a switch at the jack socket on single later appear. In the present apparatus it is desired that the instrument upon the line shall be shunted or locked out of the circuit when not in use, but the same can be either locked or unlocked at all times as may be desirable. I

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the in-- vention herein disclosed can he made within the scope of what is claimed without departing from the spirit of the invention.

In the drawings-Figure 1 is a diagrammatic View. illustrating the present invention as applied to the exchange and a single subscribers set in an ordinary loop circuit 1 without the employmentof a selecting key.-':"

Fig.2 is a similar view showing the apparatus used in connection with the present in-x vention when a selecting key is employed on party line circuits. Fig. 3 is a front eleva tion of the receiver lock mechanism and the automatic, ringer actuating mechanism, the

parts being in normal position. Fig. 4 is a" similar view with the parts in the position a. they assume when the selected or called sub-. scriber is placed in line but after the party called has remo ed ;the receiver from the Fig. 6 is a section taken on line 6-6 of Fig 3. Fig. Tis a section taken Fig. 3. Fig. 8 is a detail elevation of the call-up alarm especially designed for opera tion in the present system. Fig. 9 1s a section on line 9-9 of Fig. 8. Figs. 10 and 11 are detail views of the jack plug with the automatic call-up alarm attachment thereon.

In order to fully understand the present invention, the diagram of Fig. 1 will firstbe described iii-general. hile t e di g am of on line 7-7 of inserted in either of I line Fig. 2 will be taken up in its order directly itrfter the description of the diagram of Referring to the drawings, E designates the exchange, and S one of the subscribers sets, the two. line wires L and L constituting a loop circuit connecting the exchange to the subscribers sets, while in the exchange is the usual jack plug J and the calling jack plug J. At the exchange there is located the calling jack socket 1 and the answering jack socket 1, these being of usual structure for the reception of the respective jack plugs before described.

Disposed in operable relation to the respective jack socket 1 is a switch or spring contact arm 2 carrying the abutment 3 which is normally held in the position as shown in Fig. 1 by means of the limiting means 4, the

outer free end of the spring contact 2 being u with the point 5 connected to the conductor 6 and thence to the L, the spring contact 2 being connected to the line wire L, when the jack plug is in the socket and completed through the usual cord. When'the calling jack plug is the calling jack sockets 1, the projection of the spring contact 2 is engaged thereby and moved so that the free end thereof will engage the contact point 8, disengaging from the contact point 5. This action will throw'into the line the conductors 9, and 10, battery B, conductor 11, conductor 7, the calling jack socket 1 and the line L, and as the spring contact 2 is connected to the line L, the battery B is thrown normallv in contact into the line asis the usual practice in calling with loop circuits. The two conductors 11 and 12 connect the answering jack socket 1 to the line wires L and L, respectively.

The subscribers sets each constitute the branch conductor 13, which is led into and connected to the receiver hook 14 which normally when the receiver R is upon the hook is held downwardly and in contact with the contact 15, which in turn is connected to the conductor 16, the hinges 17 and 18 of the usual cabinet 01' casing for the call up bell 100 and the other instruments, the conductors 19, 20 and 21 completing such circuit and the loop and practically constituting with the conductor 13, wire L. The magneto M is bridged across the conductors 19 and 21, through the usual armature shunt, so that if desired the magneto may be used for calling purposes only,

when the subscriber is calling the exchange. This may be connected in any well known manneri and is here shown, so'that the transmissioncurrent will pass through the con-' ductor 20, the line of least resistance.

Connected to the line wire L is a conductor 23 which has connected therein the electromagnet 24, the conductor 25 leading from laid electromagnet to the line wire L.

a shunt from the line it will be seen that the throwing of the batteries B into the line wires L and L will energize the electromagnet 24, the purpose of which will presently appear. Also shunted from the line wire L is a conductor 26, which leads into and is connected to a spring plate 27, whose point 28 normally engages the spring plate 29, said spring plate 29 being connected through the medium of a conductor 30 to the line wire L and bridged across beyond the main-connection of the subscribers set to said line wire L, these shunt circuits forming means to shunt the transmitter and receiver from the line as will presently appear. The armature 31 of the electromagnet 24 controls the two pawls 32-and 33, one of which is pawl, while the other is a retrograde preventing or arresting pawl for the respective ratchet wheels and 36, the spring 34 normally holding the respective pawls 32 and 33 in the position as shown in Fig. 3. These ratchets 35 and 36 are keyed upon to operate the shaft 37 which carries the two disks 38 and 39. The disk 38 is provided with a plurality of peripheral radially disposed pins 40, said pins being disposed in the path to engage the respective spring terminals or arms 41 and 42, said pairs of spring terminals being so disposed and ar ranged that contacts 41 and 42 are normally open, being closed as will later appear. The disk 38 is also provided with the pins which are disposed in'the path, at the proper time as will later appear, to close the normally open contact terminals 43 and 44. a

Leading from the spring terminal 43 to the battery 4'1 are the conductors 45 and 46, while leading from the opposite side of the battery is a conductor 48 connected to the call-up alarm or buzzer 100. The other side of the buzzer or alarm 100 is connected by a conductor 49 to the upper spring contact 50, which is disposed to be normally in co'n tact with thespring contact 51, which is connected to a conductor 52 which leads to the pivoted contact 44, whereby if either one of the pins 40 engage the pivoted contact 44, the circuit is closed toactuatethe buzzeror alarm 100.

Connected to the contact arm 41 is a con-,

ductor 53, which is alsoconnected to the electromagnet 54, and a conductor 55 leads from said electromagnet and is connected to will appear later.

When the receiverhoo'k 14 is raised after substation has been called, the two eonthe points 57 and 58 are bridged so as to the operating conductors 46 and ,56 with the etc a circuit through the conductor 59;

induction coil 60, conductor 61, transmitter T, conductor 62, batteries 47, conductor 63, spring contacts 64 and 65, which are normally held open when the receiver is upon the hook, but automatically closed upon the rise of the hook as will later appear, said circuit being completed through the c0nductor 66 with the point 57. -This circuit connects to the line, the transmitter T, so that a talking circuit is completed with the subscribers set to the lines L, L.

A vertically movable weight 67 is disposed to normally restupon and close the contacts 5051, and open the contacts difference being at the exchange. In the exchange E are located a calling and answering jack plug J, J, respectively, the" calling jacksocket 1 and the answering jack "socket '1 In'this instance,the spring contacts2, 6 and 9 are dispensed with and in lieu thereof are placed the respective normally closed spring contacts ab, and j7c which are opened by the insertion of the respective jack plugs in the sockets 1 and 1 respectively.

Assuming that the substation has signaled the exchange E, the exchange operator-in.

sorts the answering plugin the socket 1 and thus opens the contacts t e; The selecting key is then manipulated' as set forth in my Patent No. 1,061,286 datedlvlay 13th, 1913, and the various shafts 37 of all substations are rotated, the uncalled substations being shunted from the line, while the contacts-48 and 44, are closed by its pin 40, so

that. the call-up alarm 100 is energized.-

The elevation of the receiver R in the called substationelevates the weight 67 from the contacts 50 and 51, so that the call-up alarm circuit'is open at this point, and the alarm is deenergized,

The selecting contacts 60, 60 and 61, 61 are disposed to be actuated by the selecting key mechanism and operate to throw the batteries B upon the lilies L, L, and prop erly actuate the shaft 37 so as to rotate the disks 38 and 39, to elfect the placing into the talking circuit of the selected and called i subscribers instruments and the shunting therefrom of the uncalled subscribers.

In order that the battery B will not be diverted from the lines LL, when it is desired to actuate the electro-magnets 24 of the system. and thus simultaneously actuate the shafts 27, the contacts 6060 and 6 1'61 are provided. The contacts 60-60 are opened when the contacts 6l6l are closed and vice versa. The circuit, when the contacts 6161 are closed, is as follows: the battery E the conductor s, the contact 61 61, the conductors 'r and g, the line L to the sub-station, the conductor 25, the electromagnet 24, the conductors 23, 22, 21, 20 and 16, the contact 15, the receiver hook 14, the conductors 13 and L, and the conductor 0. The contacts 6060 in. being opened, open the exchange signal S at the conductors pp.

Shunt and lock out Janice-One of the lock out or shunt devices on plate 200 is located in each subscribers set, and carries the pivoted lever 71, which has its outer free end connected at all. times to the receiver hook Ll through rod 70, so that the lifting of the receiver hook will also lift the lever 83, which is pivotally supported by means of the pin 72 to the plate 200. Carried by the lever 71.near the lower edge thereof is a frame 73 in whichis pivoted the arm 74, whose hooked end, 7 5 normally projects belowthe lever 83 and abuts the plate 200, the spring 7 6'normally holding the same in this position, and as clearly shown in Fig.7.

The lever 83 is provided. with the shoulder 77 which is disposed in the path of to be .abutted by the freeend 78 of the bell crank lever 79, which is pivoted at 79 to the plate 200 and is provided with the fiat spring 80 which is disposed to have its free end engaged at all times by the'pins 81 of the disk 39, said pins actuating the lever 79 to move the end 78 into and out of engagement; with the shoulder 77 of the lever 83; This lever 83 is further provided with the downwardly projecting terminal 82 which is disposed to engage the free end of the contact 2&,'sothat when the parts are in the position as shown in Fig. 3, the contacts 27 and 28 will be closed, but when moved to the position as shown in Fig. 4, the receiver hook having been raised, the, hooked terminal 82 will move the contact 28 downwardly and separate the same from the contact 27 thus opening the circuit at that point. Pivoted upon the same pin 72 is the lever 88 which car ries a pin 84 which projects through the curved slot 85 of plate 200 and carries the weight 67 as before described.

Assuming'the parts to be in theposition as shownvin Fig. 3., "and the receiver is re moved from the hook 14, the hook rises, pulling the link so as to raise the lever '71' and through the hooked arm 74 will simultaneously lift the lever 83, thus lifting the weight 67 so as to permit the opening of contact arms 50, 51, stopping the alarm, and closing the contact arms 64, 65, and as the hook bridges the contacts 57--58, the transmitter and receiver are in the usual manner ing battery to magnet 54 and said wardly,

- and the terminal will depress the contact 29 and separate it from the contact 28. This opens the circuit to the bell 100. The trigger 87 not being affected by thema'gnet 54, is in the path to engage the free end of the lever 83, and thus lock it elevated, as shown in Fig. 4, and during the conversation. After the conversation, should either of the parties leave the receiver oil of the hook,

'iust before the jack plug is taken down contact members 41 and 42 will close by reason of the pin 40 engaging therewith when exchange operator operates the magnet 24 to restore the shaft 37 to normal, thus connect magnet will move the trigger 87 drawing pawl 88 from engagement with lever 83, said lever will fall by gravity closing contacts 27 and 28 shunting the telephone set from the circuit. Weight 67 has also fallen closing the ringing circuit at 50 and 51, and opening the contacts 64 and 65 in the battery circuit. In order to release the lever 83 automatically, during the movement of the lever 71 upthe plate 89 carrying the arm 90 is provided and carries the wedge-shaped piece 91 which is disposed to engage the inner side of the arm 74'and move the hook 75 outwardly to releaw the lever 83 and permit 'the weight 67 thereof to move by gravity to the position as shown in Fig. 3 if the magnet 54 is energized so that the catch 87 is withdrawn. In the position as shown in Fig. 3, the contacts 41 and 42 are opened so that the electromagnet 54 will be deenergized but as soon as the shaft 37 has been rotated a distance equal to one-half of the distance between the pins 40, the contact at 41 and 42 will remain broken'by reason of the fact that the pins 40 are omitted from the first half step position. This permits any subscriber on the line to take down his receiver and converse with the exchange after the exchange operator has stepped the shafts 37 a proper number of steps, depending upon the particular substation, and the pivoted contact 44 will be engaged by a pin 404 and moved into engagement with the contact point 43,- thus deenergizing the electromagnet 54 and closing the circuit at 43-44 to ring the alarm 100, the weight 67 being down and in. its lowermost position so that t e con:- tacts 50 and 51 are closed and the contacts 64,. open. This action takes place, as shown in Fig. 1, when the calling lug is placed within one of the calling jac sockets 1 and moves the contact 2 from point 5 to point *8, and under normal conditions, with the point 5 engaged by the contact 2, the device will assume the position as shown in Fig. 3, but when in contadtwith point 8 the device will assume the position asshown in:

e y 4 contacts. 41 and 42, the' wnductor 53, .the

The pins 40 are so disposed that when the shaft 37.has been further revolved in calling a subscriber in all uncalled sets, the

contacts 41 and 42 are closed and thus the circuit with the battery 47, to energize the electroma et 54 will be as follows:-the the conductors 46 and 56, the

electromagnet 54 and the conductor 55. Should the receiver be oif the hook 14 in any of the uncalled subscribers sets, the energization of the electromagnets will attract the armature catch 87, and the lever 83 will fall and permit the closure of the shunt contacts 27 and 29 so that such uncalled substation will be shunted from the line. In all of the uncalled substations,

where the receiver is upon the hook, the lever 83 is held down and the shunt contacts 27 and 29 are closed. In the calling and called substations, the contacts 41 and 42 are open, as one pin 40 is omitted at the position in .which pin 40 engages the contacts 4H4 for a called substation, and the circuit to the electromagnet 54 is open, so that the raising of the book 14 will carry withit the lever 83, as indicated in Fig. 4, and the contact 29 will be separated from the contact 27, placing the shunt at the called and calling substations open with the substations properly connected to the-line. At the same time that the called substation was connected either by the jack plug, as in Fig. 1, or the selecting key K 2, the proper . pin 40, and 44 and alarm circuit to energize the call-up alarm 100, which remains energized until the called subscriber removes the. receiver and the hook 14 is raised. Such action will lift the weight 67 and open the contacts 50 and 51 and thus the local circuit to the call-up alarm. 100. The subscriber cannot restore his receiver hook to normal position, being under the control of the exchange o orator solely, since the catch 79 norm holds-the lever 83 down by its engagement with .thesshoulder 77, and said lever 83 is not released until the exchange 0 rator has operated the m at 24 to step t e shaft 37 at least on -hal step, or such number of half steps as will bring thepin 40 to close the contacts 43-44. During the the magnet 24 is held energised so that the shaft 37 is in half step position, full step position. Consequently the contacts 43-44 are closed, at the allinf called substations (if on :difierent ines), the contacts 41-42 are closed stall other substations, the pins 40 being omitted in and not in as n Fig. closed the contacts 43 thus closed the local call-up this a connection,

and

the talking position of the calling and called I substations, so that of ringer alarm used with this apparatus, the same comprising a plate 92 having the electroni agnets 93 which are" connected to the respective wires 48 and 49 of the subscribers sets, said plate 92 also carrying the rotatable stud 94 having keyed thereon a. sleeve 95 which carries the large ratchet wheel 96 and the bell or other audible signal means 97. a plurality of cut away portions98 in line with the clapper 104, so that where the device is used on a party line although all of the elcctromagnets 93 may be energized, only that solid portion in line with the clapper 104 will be, affected.

The armatur 99 is disposed to be actuated by the electromagnet 93 and carries near its outer end a sleeve 101 to which is pivoted a pawl 102 actuated by the spring 103 and normally held in engagement with the teeth of the ratchet 90, so that the actuation of the armature will impart the desired lifting movement to the ratchet wherl 96 and thus rotate the bell 97 to bring the cut away portion 98 or solid portion thereof into alinemcnt with the clapper 104.

The clapper 104 is made in the form of a tube provided with elongated diametrically disposed slots 105 in which is slidably mounted the pin 106 carried upon the extreme end of the armature 99, the slots permitting a slight movement of the pin 106 therein without affecting the tubular casing of the clapper 104. In order to produce a desired vibrating movement to the clapper 104, the two springs 107 are disposed within the casing, one of the springs being opposed to the sealed end 108 of the clapper casing while the other is opposed to the removable and adjusting plug 109 at the other end of the casing. The springs are connected to the pin 106 and thus normally hold the pin seated within the central portion of the respective slots 105.

vAs all of the respective coils or electromagnets 93 of the various subscribers sets are of low tension winding, it is evident that a low voltage current may be employed foroperating the same thus dispensing with the costly devices which are in vogue and permitting the employment of the usual form of electromagnets where the electric bells or buzzers are employed. It is also 'evident that these coils normally are actuated by the battery used by the telephone and that by reason of the fact that these bells are actuated by a mechanism in each individual subscribers set, it is evident that the ringing key of the switch board with its necessary connection is dispensed with.

By the use of the call-up alarm herein set forth, it will be seen that thework of the operator at the exchange is lessened and that by reason fpf the fact that the selection of the subscriber due to the insertion of the This bell is provided with calling jack plug will immediately connect the call-up alarm moving the alarm mechanism continuously and ringing the bell or buzzer, by intervals, until the receiver is removed from the book of said called sub scribers set or until the jack plug is taken down. This will insure the necessary and automatic actuation of the calling-up feature in each subscribers set and thus dispense with the work placed upon the exchange in connecting the called to the calling subscriber and actuating the ringin alarm until the called subscriber replies. 1% is also evident that this form of buzzer and lock out device may be connected to ahy telephone system now in use and dispense with the usual ringer at the exchange and its various connections, or that the device may be used in connection with the selecting key and system as shown in applicants applicati on before mentioned.

' Operation. Referring to Fig. l and assuming the parts to be in the position as therein shown and that the operator has received a signal that a party is desiring to use the circuit, the jack plug is inserted in the usual manner, moving into contact with the abutment 4 and thus moving the spring contact 2 from engagement with the point. 5 to the point 8. This action will open the line circuit and simultaneously throw in the storage battery B, located at the exchange. The contacts 2 and 5 are only open as the jack plug is passing the pointsg, 4 so as to permit the storage battery in the line circuit to operate the electromagnet 24 in the various subscribers sets. This action, energizing the electromagnet 24, will operate the pawls 32, 33 so as to rotate the shafts 37 one-half the distance between two pins 40.

a This action will open the contact points '41,

42 'and close contact points 43, 44. The closing of the contacts 43, 44, the receiver being on the hook'and the weight 67 down so as to close the contacts 50 and 51 and open the contacts 64, 65, will connect the ringer alarm 100 to the batteries 47 as heretofore described and thus cause the ringing of the alarm at the desired called subscribers set which will continue ringing until the receiver R is raised from the hook 14 or until the jack plug is taken down. Fhe lifting of the receiver from the hook will permit the hook to rise and through the contacts 57, [58 will connect the receiver and transmitter into the line, opening the contact points 50, 51 in the circuit to the bell 100 and closing the points 64, 65 so that the parties may now communicate. Should the called party, have the receiver of? the hook, when being called, the levers 71 and 83 will be raised, and the'trigger 87 will have engaged its pawl 88 with the lever 83, thus holding the lever 83 raised; but as the calling of the party has caused the cnergizato fall by tion of the magnet 54, due to the pin closing contacts 41-42, the lever 83 due to the attraction of the trigger 87 and the release of the pawl 88 therefrom, will fall by gravity. As the hook 75 of the arm 74, due to the engagement of the arm 74 with the arm 90, has been held out of engagement. 83, the lever,83 is thus free with the lever avity and under the influence of the weig t 67, when the magnet 54 was energized, assumed its lowermost position. The weight 67 thus closes the contacts 5051, and opens contacts64-65 (Fig. 5), so that the battery circuit will be opened until the receiver hook is again adjusted, thus saving the battery and permitting the alarm 100 to be in a position to be actuated, should the party be selected from the exchange, such selection from the exchange closing contacts 4344,'and closin the circuit including the alarm 100 an contacts 50 -51. Should any of the receivers in the various sub-stations be oil of the hobks, and even should the levers 83 and weights 67 be elevated and held elevated by the pawls 88, it is evident that the init al movement of the disk .38, will cause the pins 40 to close their respective contacts 41-42, so

. that the magnet 54 will be energized and the I ductor 26', the contacts 27-28,

various triggers. 87 will be attracted to release the lever 83 which due to the weights 67 will fall and close the contacts 5051 and open the contacts 64-65. This action laces the sub-station in proper position to rung from the exchange, even thou h the receiver remain off the hook. Whent 'e control mechanism of the substation is in the position as shown in Fig. 3, that is with the contacts 2728 closed, the sub-station is' shunted from the linethrough the conand the con,- ductor 30, but when the sub-station is callmg central, or is free to respond after being selected and called, the contacts 2728' are opened as in Fig. 4. It will that'the pins 40 control both contacts 43, 44 and 41, 42, through the contacts 43, 44 controlling the alarm 100 and through the contacts 41, 42 controlling the electromagnet 54 which is disposed to release the trigger 87 fromthe lever 83 after the called subscriber has completed the conversation with the calling subscriber.

\Vhat is claimed is: I I 1. A telephone system, having an exchange station and a plurality of sub-stations, each sub-station having a circuit including a battery,.a call alarm in the circuit, .and means controlled by the insertion and removal of a calling plug in its socket at the exchange station to close and open the call-alarm circuit.

2. A telephone system, having an exchange station and a plurality ofsub-stations, each sub-station having a local batchange station and a station to thus be seen normally open,

local battery circuit, a call alarm in the last circuit, and means controlled by the insertion and removal of a calling plug in its socket at the exchange-station to close and open the call alarm circuit.

3. A telephone system, having an explurality of sub-stations, each sub-station having a circuit including a battery, a receiver hook forming one closure for said circuit, a call alarm in the, battery circuit, said circuit being open when the-"hook is raised, and means con trolled by the insertion and'removal of a calling plug in its socket at the exchange closeand open the call alarm circult. a I 4. In a telephone system, the combination of an exchange and a plurality of substations, each of said substations including a'receiver, a local battery circuit, a transmitter in said circuit, a call-up alarm connected in series with the battery, automatic means for connecting and disconnecting the call up alarm relative to the battery, manually operated means-in the exchange for connecting a called to a calling substation and for automatically actuatin the automatic means to connect the ca; -up alarm in the called substation with the battery to energize the call up alarm, and a switch in the connection with the call-up alarm and battery controlled by the receiver in the called substation, whereby the removal of the receiver opens such switch and the call-up alarm circuit.

In a telephone system, the combination of an exchange and a plurality of subscribers sets of instruments, an electromagnetically' controlled circuit making device disposed in 'each subscribers set and connected to the line. a call-up alarm in each set, an individual circuit connected therewith and controlled ,by said device, said circuit belng normally open. a calling jack circuit to each set located in the exchange, and means in operable relation thereto actuated upon the insertion of the calling plug within the socket to actuate the device in the called subscribers set to close the call-up circuit and actuate the alarm.

6. In a telephone system, the combination of an exchange and a plurality of subscribers sets of instruments, a transmitter and a receiver in each set, an electromagnetically controlled circuit making device dis each subscribers set and connecte line, a call-up alarm in each set, an individual circuit connected therewith and controlled by said device, said circuit being a calling jack circuit for each set located in the exchange, means in operable relation thereto actuated u n the insertion of the calling plug wit in the 8. In a telephone system, the

socketto actuate the device in the called sub- 'scribers set to close the call-up alarm circuit and actuate the alarm, and means controlled by the receiver hook in each subscribers set for opening the call-up alarm circuit and connecting the transmitter and receiver to the line.

7. In a telephone system, the combination of an exchange and a plurality of subscribers sets of instruments connected electrically for the transmission of intelligence; said subscribers sets each having meanscontrolled from the exchange for shunting the set from the line, a local battery, a transmitter and a receiver, a circuit, lncluding the local battery controlled by the shunting means, a call-up alarm in the last circuit; and means for-calling the'called subscribers set in the exchange and for automatically closing thecall-up alarm circuit of the called subscribers set.

combination of an exchange and a plurality of subscribers sets of instruments. connected for the transmission of intelligence; saidsubscribi-ers sets each having means controlled from the exchange for shunting the set from the line, a local battery, a circuit including the local battery, a transmitter and a receiver, another circuit connected to said battery, a receiver hook controlled switch in saidlast circuit controlled by the receiver, it being closed when the receiver is upon the hook, a call-up alarm in the last circuit, and-a second switch in the last circuit controlled by the shunting means; and means for connect-c ing the called subscribers set and simultaneously actuating the shunting means'inthe,

" 9. In a telephone system, the combination of an exchangeand a plurality of subscrib} exchange forshuntingthe sets from the line,

called subscribers set .to close. the second switch of the call-up alarm circuit to energize the alarm. v

ers sets of instruments; said subscribers sets eachinc'luding a transmitter and a re- W1tnesses':

ceiver and havingmeans controlled' froin the and a call-up alarm connectedfto the local Oopies of this patent may be obtained for battery of the set; means for calling the called subscribers set in the exchange and for automatically connecting 'the call-up alarm With the battery of the called subscribers set, and means controlled by the receiver hook due to the removal of the re- -ce1ver therefrom for disconnecting the callup alarm circuit and for connecting the transmitter and receiver to the line.

10. In atelephone system, the combination of an exchange and a plurality of subscrib- I ers sets of instruments; said subscribers sets each having a transmitter, a receiver, means controlled from the exchange for shunting the sets from the line; and a callup alarm connected to the local battery of each' set; means for connecting the called subscribers set and automatically actuating the device in the called subscribers set to connect the call-up alarm with the battery, and means controlled by the receiver hook;

of intelligence, an electromagnetically con-.

trolled means disposed in each subscribers set and connected to the line, said means being operated due to the introduction and removal of a calling jack plug in a calling socket at 'the exchange, a call-up alarm in each subscribe'rs set, a circuit including the alarm and the batteries of each set, a receiver lock, a pair of contacts normally open and disposed .in operable relation insaid circuit, and another circuit including said actuating the receiver lock.

In testimony that I claim the foregoing as my own,'E- I have hereto affixed my signature in the presence of two Witnesses.

1 REUBEN C. M. I-IASTIN GS.

MATT J. SHn rrAN, MARY E. STRISTER.

five cents each, by addressing the Commissioner of Eatents, Washington, D. 0.-.

battery and controlled by said device for

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