US1135121A - Telephone-exchange. - Google Patents

Description

F. A. LUNDQUIST.

TELEPHONE EXCHANGE.

APPLICATION FILED MAY 23. 1903.

Patented Apr. 13,1915.

. F. A. LUNDQUIST. TELEPHONE EXCHANGE. APPLICATIQN FILED MAY 23 1903.

Patented Apr. 13,1915

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' TO WESTERN ELECTB IC'CQMPANY, A CORPORATION OF ILLINOIS.

TELEPHONE-EXCHANGE.

Specification of Letters Patent. Patented Apr. 13, 1915.

Application-filed May 23, 1908. 7 Serial No. 158,443.

To all whom it may concern:

Be it known that 1, Frank A. LUNDQUIST, a citizen of the United States of America, and a resident of Chicago, county of- Cook, and'State of Illinois,haveinvented certain new and useful Improvements in Telephonespecification.

My invention relates to automatic exchanges in which the calling subscriber.se-. lects the telephone called, and has for'its.

object improvements in the construction and arrangements shown in my Patent Number 606,764, issued July 5, 1898, and in my Patcut No. 747,197, issued December 15, 1903. The'main switches and telephone boxes are similar to those shown in the first-named patent, but differ in some details. The plan of making electrical connections through an auxiliary-switch, as described in the secondnamed. patent, is continued in this, but the construction of the auxiliary switches is different and a different system is employed in makin such connections.

In t e accompanying drawings Figure 1 is a plan of one of the main switches: Fig; 2 is an elevation of the same; Fig. 3 is a vertical section of the same partially diagrammatic'; Fig. 4 is a section on line 4-4 of Fig. 2; Fig. 5 is a plan and Fig.6 isa side elevation of. one of the auxiliary switches; ig. 7 is a partial vertical section corresponding to Fig. 6; Fig. 8 is a horizontal section on line 8T8 of F ig. 6, the magnets at the right being in plan; Fig. 9 is a section on line 9 4) of Fig. 6; Fig. 10 is a diagrammatic now showing the operation,

of the parts at the extreme left of Fi s. 5 and '6; Fig. 11 is a front elevation o the upper telephone box; Fig. 12 is an interior viewof the two telephone boxesshowing part of the electric circuits; Figs. 13 and 14 taken together are a diagram showing. the complete circuits for one telephomnoi'fe main switch and one auxiliary switch; Figs. 15 and 16 taken together-are an abridged diagram showing six telephones (marked re- 1 spectively, No. 1, No. 2, etc.) with their correspondin main switches and two auxiliary switc es; Fig.- 17 is a'front elevation with the dial and connected mechanism removed from its su porting plate; and Fig. 18 is a plan of the same the supporting cover being shown in section.

' In the'said drawing M is a switch car.

Exchanges, of which the following is a.

I rying' frame or base in which is mounted an insulating'disk 0 provided with a series of contact points L. Supported in the frame M. is a vertical. spindle M upon theupper end of which is an arm M and a disk M3; while upon the lower end of said spindle is secured an arm having the end N in electrical connection therewith and the end N insulated therefrom. The ends N and N comeinto contact with the contact points L. Loosely mounted about the spindle M and supported on the frame M, is a ratchet wheel M provided with both spur and crown teeth. A magnet A, with its armature lever A and pawl A, serves to turn the wheel M by engagement with the spur gteeth thereof. The arm M is normally in engagement with the crown teeth so that the turning of the wheel M serves to also turn'the spindle M, v

and consequently the arms N and N. Supported at a suitable place on the frame or base M is a magnet B whose armature lever B has a flexible end B that normally rests next to the beveled edge of the disk M as shown in Fig. 3. At one place in the periphery of the disk M is cut a notch 13*. The spindle M and the parts connected thereto,

have a normal position which is determined by contact between the arm M and a stop M on the base M. When in normal position, the notch B comes in line with the lever B After the spindle M and its connected parts have been moved by the action of the magsition by sending a current through the magnet B, which action moves B and causes the flexible end B to slide over the beveled edge and under the disk M Then, as soon as the current is broken through B, the spring B tilts the lever B to raise the disk M and consequently the arm M free from the teeth of the wheel M. The spring .l then returns the spindle M to normal position, when the notch B being in line with B the parts settle down with M again n contact with the teeth of the wheel M. The

-.action of the magnet A is, therefore, to

and 70 (see Fig. 13.) It also tilts a lever B which carries an insulated ontact ponitE- B it makes an electricalcontact between B fastened an insulating piece 24. Adj acent adapted to slide under, and be caught and held by, the hook C on the armature lever C When the magnet C attracts (J it releases G f-romB and permits the lever B to fall back against the contact point 39. A. fourth magnet D serves to make electrical contact between D and 62. Secured to, but insulated from, the lever A is a bent lever 24, to one end of which is connected a spring 23 that retracts the armature from the magnet A, and to the other end of which is to 24 are four insulated strips 26, 2'7, 28 and 29. These are normally separated from each other, but the-tilting of the lever 2 1 closes the contact between '26 and 27, and also between 28 and 29. Contact is prevented between 27 and 28 by a piece of insulation carried by one of them and located between the two. The tilting of the lever 24 also makes a contact between 'it and an adjacent strip69.

The auxiliary switch is shown in'Figs. 5v

to 10 inclusive. The upper part of this switchis' practically the'same as that of the main switch just described and does .not need additional description beyond the state ment that the magnet F turns the pointer P over the contact points Q, and magnet H releases the pointer so as to permit it to be returned to normal position. In the lower part of the frame S are supported a series of insulated contact points R from which run the wires 98. The points R are arranged in rectangular form and the-total number-is equal to, or greater than, the total number of telephones in the exchange. There are preferably nine or ten contact points R in each transverse row, and there areas many rows as necessary to make the full number for the required exchange. Supported over the contacts R is a ratchet rack T parallel with the greater length of the auxiliary switch. The rack T is moved step by step to the left by magnet G, armature lever G and pawl G A spring V and cord V serve to draw the rack T to the extreme right, which is its normal position. A set screw T adapted to come into contact with part of the "frame S, serves to determine the extreme movement to the right. A pawl G supported in the frame S, serves to hold the rack T from being retracted by V and V until the said pawl G is released. This release is eflected by an arm G which is connected to the main spindle of the switch, so that when the magnet'H raises this spindle' to permit the pointer P to return to its normal position. it also releases G and permits the rack T to also be returned to its normal position. I Secured to the rack T is a cross-head, or carrier, which carries a series or group of insulated strips, or contact devices, K, adapted to make simultaneous contact with all of the contact points R in v15 against which a I by a push button 17 0 located on the front cover. The receiver210 is supported on the any one of the transverse rows. The opei'ation of these parts is that the magnet Gr moves the strips K forward- (to the'left) by leases the holding devices so as to permit V and V to return the strips K to the extreme (normal) position to the right. The operation of the magnet E at the left-end of the auxiliary switch is shown diagrammatically in Fig. 10. Adjacent to the armature lever E are four insulated metal strips 13, 44, 45 and 46. The strips 45 and 16 aren'ormally in contact with each other, but the lever E when moved by the magnet E, breaks this contact and makes a contact between 43 and 4A.

' The telephone boxes are slmilar in their] general arrangement to those shown in my previously mentioned patents. On the front cover of the upper box is a crank 199 for turning the spindle 200 and gear 201 which meshes into a larger gear 202 on the spindle 203. Connected to, and turning with, the gear 202 is a ten-pointed star wheel 204 which engages an insulated-piece on the lever J. Normally the lever J is in the position shown in the drawings, with its shorter end in contact with the contact point J but the rotation of the star wheel 20 1 vibrates the lever J so that the said shorter end makes alternate contacts between 5 and J A pin 205 on the wheel 2041: comes into cont-act with the striker 2060f the bell 207 once duringeach rotation ofsaid wheel, consequently the bell 207 rings once for each ten times that the lever J connects to the contact 5. From the contact a wire it runs to another contact spring 17'may be pushed ordinary hook 211, which, in its lowest 'position, is in contact with the point 212 and in its upper position with the points 7 and 213. The hook or lever 211 is so ararnged-that during its descending motion it will move a secondary lever 208, so as to cause electrical contact between 71 and 72 (see Fig. 14) and will release this contact before it reaches its lowest position. During the upward motion the lever 211 catches or hookson to the lever 208 so that when it again descends, it again makes contact between 71 and 72. This process of hooking on and releasing is substantially the same as that shown in my 'points,.the purpose of which is evident from the drawings. The various parts mentioned are connected together by electricalconnections in the manner illustrated in the drawings, and which will be readily understood by following through the electrical circuits hereinafter described. In carrying this system' of telephone ex my PatentNo. 747,197 I supplied one auxiliary 'for each group of nine or ten main switches, thus making it necessary for a subscriber to first select the proper auxiliary switch'and later to select the proper mainswitch of those connected to the auxiliary switch. In the present application I connect all of the main switches to each auxiliary switch and then provide means happen that there will be frequent delays by 'diiferent subscribers waiting for a particular auxiliary switch when there are several idle ones. In my present arrangement, a delay can occur only when all of the auxiliary switches are in use, and connections can bemade as soon as any one is at liberty without any respect to which one it is. To accomplish this I run a wire 98 from the normal contact point for the pointer N of' the first main switch, and from this wire I run branches to the first contact point in the first transverse row of contact points in each auxiliary switch. From the normal contact point for N of the second main switch I run a similar wire withbranches to the second contact of each auxiliary switchf From the third main switch are similar connections to the third contact of each auxiliary switch, and so on. It will therefore be apparent that the 17th main switch would be connected to the seventeenth contact point in the rectangular arrangement of each auxiliary switch, which for convenience sake would be'the seventh contact in the second row of contacts. Or, stated in the other way, telephone number seventeen may be reached at its normal for' N through the seventeenth contact of any auxiliary switch. In the same way telephone No. 328 would be reached through the eighth contact in the thirty third row of any auxiliary switch. In each main switch the contact point for N next beyond the normal has a wire 55 thatruns to the magnet Or stated in the other way, from the magnet F of the first auxiliary switch, runs a wire .with branches .tothe second contact point for N of eachmain switch. From F of: the second auxiliary switch a wire with branches connects-to the third contact for N of 'each main switch, and so on. In Fig. 13 of the drawings these connections are shown as made between the 46th main switch and the second auxiliary switch, the other connections being left unshown but would be made in the same manner between any main switch and any auxiliary switch. The pointer N being on the same spindle with pointer N moves with it and both are on their normal contact points at the same time. The normal contact point for N is a blank, but from the second point a wire runs to the pointer P of the first auxiliary switch, from the third point to P of the second auxiliary switch, and so on. From'the normal contact point for P of each auxiliary' switch a wire runs to the magnet E for that switchand thence to a line running through. the battery Y. The second contact pointfor P is a blank. The third contact point has a wire running to the'magnet G and thence to a line running through the battery Z. The

succeeding contact points in regular order run to the first, second, third, etc., strips or contact devices When a subscriber wishes to call another he removes his receiver, turns the crank'199 until the bell 207 rings once and pushes the button 170 once. If it. is telephone number forty-six he wants, he turns crank 199' till the figure four shows on the dial in'front,

(which dial is the marked front face of the gear 202 or a disk secured thereto), and then pushes button 170 sixv times. He then turns the generator crank to call-and'waits for reply. When through talking he hangs up This explains the operations the receiver. as far as the calling subscriber is concerned. The called subscriber simply takes down and hangs up his receiver.

Turning now to the automatic operations resulting from the operations of the calling subscriber, the removal of receiver 210 from the hook 211 permits the said hook to rise in the ordinary manner and come into contact with 7 and 213. The turning of crank 199 until the bell 207' rings once vibrates the lever J ten times and makes ten contacts with 5. Upon making a contact at 5 the current flows from battery Z--4-5 6 --7-21I-73 20 21 A- 22 B, C (B being normally under and in contact with C )25,99Z. Each ti'methe current is thus sent through A it actuates magnet A and moves the pointers N and N over their respective contact points until the pointer N reaches a contact whose wire 32 is connected to an axiliary switch which is not in use and consequently has itspointer P on that the current can no longer flow through As this occurs,

magnet A by way of C 4 however, when A is-attrac'ted, there is contact between 28 and 29 and the current continues to flow through A'by .way of 3529 28-3699{Z, till the contact is broken in the telephone box at 5. The contact be- .. tween 28 and 29 therefore acts as a safety to prevent the circuit being broken through .Abcfore the other operations can be completed which are incident to the pointer N reaching the connection to an unemployed auxiliary switch. lVhen the contact between J and 5 is broken by the rotation of the star wheel 204: under these circumstances, it permits the breaking of the circuit between 28 and 29. This leaves the circuit beyond A open in both directions, consequently further rotation of the crank 199 and star wheel 204 will have no effect whatever. Returning again to the circuit described as running through C; and E, it will be seen that attracting'E closes the contact through E 43 and 14 at the same time B comes into contact with 39. When this occurs the current flows from Z-100-4-5-J (this current i being simultaneous with the one made be-.

tween J and 5 and flowing through 28 and 29) c .7--211 7a 20 -e" N -32-P33-4L1E -44-43-i748- F 99Z. The current through F moves the pointer P to a blank contact and consequently breaks its own circuit at this point. i

As, however, this break occurs whilst?! and 4-1 are in contact the current flows from 32 to 48 by way of 49, 44, 43, and 47. The breaking of the circuit in the telephone box between J and leaves the line through F open in both directions, consequently further notatIipn of the star wheel 204: will not afect i.

It will be seen that the general resultof removing the receiver and turning the crank 199 is to move the pointers N and N of the other main switch can reach it until its pointer has been returned to normal position, because it is through that point that the connecting circuits are made. Secured to the spindle 203 of the star 'wheel 20% is a dial having numbers from 0 to 9 on its face, one. of which shows through'the; opening shown in Fig. 11. The lower positiongof the 'crank.l99 is its normal position, and when in this position either-Oor 5 shows at' this opening because it takestwo rotations of said crank to make oneof the star wheel 204, which in turn makesten contacts be tween J and 5 and rings the'bell 207 i at, the

.completion of the tenth contact, which is when 0 shows at the opening. The reason for turning the crank till the bell rings once after moving the receiver, is to leave it at .its normal position, and because there will seldom be as many as ten auxiliary switches in use at the same time.

The crank may, however, be turned any number of times, but no effect will be produced after the first unemployed auxiliary switch is reached.

Pushing the button 170 once sends a current from battery Z100'4.1517 '18- line 20, D has no eifect)53-A -N55- 48-F-99Z. .This moves the" pointer P to contact with' wire 56, when, by again turning the crank 199 and making contacts between J and 5, the current flows from batter Z 100 4 5 J67-2l1 7 2037 B3940N -32--P56-G 99Z. This moves the strips or contact devices K into contact with the first row of contact points R, and-if four contacts are made at J--5, the strips K will be moved to the fourth row of contacts B. This would be when the figure 4 showed on the face of the dial. Then if the button 170- be again pushed, the'circuit will be made in the same manner as before and the pointer 1 will'be moved into contact with the line 60 that reaches the first contact strip K. Ifit is the sixth strip K that is wanted, then the button 170 is pushed six times: and if the strips K are on (or have been moved to) the fourth row of contacts R, then the pointer P is in electrical connection with the normal contact point for N of the forty sixth main switch.

It will be observed that after the pointer Y P has been moved into contact with the line running through Gr, each contact made by turning the crank 199 moves the strips K over ten contact points R,-and as the ringing of the bell 207 indicates-ten contacts at J, it also indicates f onev hundred contact points R. It will therefore-be apparent that the number of hundreds is indicated by the number of the strokes of the bell 207: that 505l-52-D (there being no current in the number of tens is indicated by the dial figure; and that the number of units is indicated by the number of times the but- 263 is wanted, the crank 199 is turned till the 'bell 207 rings twice and the figure 6 shows on the dial, then the button 170 is pushed three times. Passing for the moment the ringing circuit, it will be assumed that the person called has removed his receiver, then the primary circuit will be as follows: lV-89 211 213 889l 219 90-W Starting at the secondary of the calling telephone, the talking circuitwill be as followszsecondary se 210-s5 s4 s0,s1 s2 J J67-2117320- to the main switch belonging to the calling telephone I the telephone called 181716-75-87- secondary 86 210 85 8&- 80 -8l 82--J J -67-211. 732O- the main switch of the telephone called 21 r A 22-B C (the subscriber called did not send a circuit through the magnet C of his switch) 25-line 99 returning on the branch which leads to F of the auxiliary switch selected 4855, to the main switch belonging to the calling telethe calling telephone 1817-1675 87-secondary-which is the place of starting. lVhen ringing to call, the subscriber pushes in the generator crank which makes a contact between 79 and 80. The circuit thus made is the same as the talking circuit just described, except that, in the telephone box, the current goes from to 80 by way of 21876832177980, instead of by the way of the secondary.-

Hanging up the receiver depresses the hook 211 which nrst tilts and then releases the lever 208, which in turn makes and breaks connection between 71 and 72. The current then flows from battery Z- 72.7119--50-5152D53-A 5548F99.Z. Closing the contacts between D, and 62'by the action of D, and

between. 211 and 212 by the hanging up of the receiver closes a second circuit from Z- 100 72 71 19 181716-75218 70-4O -N etc., as given for the third circuit. Making and breaking the circuit --with the hook of back to through B returns the pointers N and N to their normal position and engages B The circuitthrough H releases 1 and K and permits them to return'to their normal position,

. In case the receiver should be hung-up without connection having been made to any auxiliary switch, then no current would have been sentthrough C and consequently B would be in contact with the hookof O C 25-99Z. The current through A closes the contact between 24 and 69 when a current would flow: Z100,7 2-7 119' 505123H241-.69-64:-B65799Z, which would return the pointersN and N to normal. I It will be apparent that the simple act o hanging up the receiver returns all parts to their original position ready for the next call without the necessity of ringing OH or requiring the interposition of. an operator at central.

What I claim is:

1. A series of contact points arranged in rows, a series of separate strips adapted to come into-electrical contact with the contact points ofsuccessiye rows by successive steps, a dial, electrical connections from the several strips to a corresponding series of other contact 'points on the dial, a pointer and de vices'for moving it into successive contact with the contact points on the dial, a switch, connections from said pointer to the switch and from the switch to a telephone station, and means for operating the devices for moving the pointer through the connections between said pointer and said station.

2. A series of contact points arranged in rows, a series of separate contact devices adapted to be moved into contact with suc- T cessive rows of contact points, a dial provided with a series of other contactpoints, a separate connection from each contact device to a separate contact point on the dial,

a pointer adapted to be moved over the con- 5 I tact points on the dial, separate propelling mechanisms for moving the contact devices and the pointer, a switch and a telephone station, connections from said pointer to said switch and from the switch to said station, and means for operating said propel ling mechanisms from said station so as to placethe station in electrical connection with any one of the first mentioned contact points.

3. In 'an automatic telephone exchange, a series of main switches each consisting of series of contact points, a contact maker and a magnet for moving the contact maker step by step over said contact points, said main switches being greater in number than the number offcontactpoints on any one of them,.a series of auxiliary switches equal in 'n'umber to the number of contact points onv one main switch and each auxiliary switch having as many contact points as there are' main sw1tches,connect1ons from correspondauxiliary switches to normal contact points on all of'the main switches. 4

4:. A series of contact points arranged'ln rows, a series of switches each one of which has a normal contact point, a separate connection from each contact point to the normal contact point of a different switch, a

series of contact devices and means for moving them into successive contact with the lrowslofcontact-points, a dial, a series of other contact points located in said dial, a pointer and devices for moving it over the contact points on the dial, separate connections from the contact devices to corresponding contact points on the dial, other contact points on each switch adjacent to the said normal contact point thereon, a connection from each of the other contact points on any one of saidswitches to the said pointer and other similar pointers, a telephone station and a series of contact devices adapted to be i moved over a second series of contact points, devices for moving the pointer and contact devices on the auxiliary switch, a telephone station and connections to said switches, and means for controlling" the moving devices from the station so as to establish an electrical connection from said station'through both pointers and one contact device to any required-contact pointin the said second series.

' 6. A a series of insulated contact points'and a magnet for moving'said pointer to any con tact point, a, series of auxiliary switches, connections from each contact point on the main switches to a different auxiliary switch, a pointer and a plurality of contact points on each auxiliary, switch, a row oi contact devices and a pluralityof rows of contact points'therefor also on said auxiliary switch, connections from each of said main switch consisting of a pointer,

contact devices to diiierent one of the first mentioned plurality of contact points .on said auxiliary switch, othenconnections wires from said magnet to a telephone station, and devices located at the station for completing an electric circuit through said magnet.

7. In a telephone exchange, the combination with a series of main switches each of which is individual for a connected tele phone station and each of which consists of a series of electrical connections less in numher than the number of switches, a contact maker and a magnet for moving the contact.

maker .step-by-step into successive connectlon' with the electrical connectlons, of a series of auxiliary switches equal in number to the number of connections on one main switch and connected to all of the main switches, each auxiliary switch being provided with a separate connection for each main switch, means for automatically selecting an unemployed auxiliary switch by the movement of the contact maker of'a main switch, means for isolating the selected auxiliary switch by a movement produced therein as the result of an electrical impulse sent over the conductor to it, and means whereby an operation of one main switch and one auxiliary switch so selected will serve toestablish telephonic connections between the moved main switch and any other main switchin the exchange.

a I I v 8. A main switch and a series of auxiliary switches, a pointer on the main switchmov-- able into electrical connection with any one of the auxiliary'switches, a pointer on each auxiliary switch adapted to shift such elec trical connection to any one of severalcontact devices also on such auxiliary switch, a row of such devices adapted to be moved to successive rows of contact points, a' magnet for moving the pointer and a separate magnet for moving the contact devices, a telephone station connected to the main switch, and means for operating said magnets from said station.

9 A series of rows of insulated contact points, a row of contact devices and a magnet for moving them into electrical connection with successive rows of points, a

pointer and a magnet for moving itintoi electrical connection with any ofsaid eontact devices, a series'of such pointers each one of which is connected to a similar group of contact devices and rows of contact points, a main switch and a magnet for moving it into electrical connections with any one of said pointers, a telephone stationand connections to said main switch, and means for operating said magnets from said sta tion.

10. In a telephone exchange, a switching.- system consisting of the following elements: first, a switch movable to electrical connections with anyone of-aseries of pointers; second, a series of such pointers, each one'of which is movable to any one of a group of contact devices; third, a group of ,such' contact devices for each pointer, each group of which is movable to seccessive rows of contact points; and fourth,- magnets for moving the switches and the pointers.

11. In a telephone exchange,as'witch mov-' able to electrical connection with any one of a series of pointers, a series of such" pointers each one of which is movable to electrical connection with any one' of a group of contact devices, a group of such contact devices for each pointer each group with any one of a group of contact devices,

a group of. such contact devices for each pointer each grou of which is movable to successive rows o contact (points, magnets for moving the switches an magnets for releasing the switches and pointers from their propelling magnets,-

springs for returning them to their normal positions when so released, and devices lo- .cated at said station for operating the .sev-

eral magnets.

13. A telephone station,; a item- -nected to said station and movable to electrical connection with anyone of a series of pointers, aseries of such pointers each one of which is movable to electrical connection with any one of group oficontact devices, a

group of such contact devices for each pointer eachgrou of which is movable to for moving the switches, the pointers and the contact devices, means for operating said successive rows 0 contact points, magnets magnets from said station,"other stations connected to the different contact points,

each station of which is similarly connected to a switch, and means whereby similar magnets can be operated from any of the other stations.

14. A series of switches any one of which is movable to electrical connection with any one of a series of pointers, a series of such pointers any one ofwhich. is movable to el'ectrical connection with any oneof a group of contact devices that belongs to it, a group of such contact devices for each pointer each pointers, other group ofr which is movable to electrical conne'c'tions with successive row's' of-contaot.

points, a series of rows of such contact points for each group of contact devices, separate magnets for moving the switches,

the pointers and the contact devices, and

means for automatically stoppingthe movement of any switch as soon as itsmagnet has moved it to electrical connection with a pointer to'which no other switch is' connected.

15.- A group of contact devices adapted to be moved tocontact with successive rows of contact points, a pointer adapted to be moved into electrical connection with any one of said contact 'devices,-a,switch adapted Y to be moved into electrical connection with d any one of a series-of such pointers, separate magnets for moving the switches, the pointers and the contact devices, a crank and a push button and contact closing devices operated thereby, means for operating the magnet for moving the pointer by the cone tact closed by the push button, and means Y for operating the magnet for moving the switch-by a series of contacts made by the movement of said crank 16. In a telephone exchange, a main switch for each;tel ephone,a double series of contact pointson' each switch, a correspondwhich is provided with a pointer and -a magnet for moving it,- a connection from the: pointer of each auxiliary switch to a corresponding contact point on one series of the double series of contact points and from pointer andamagnet for moving it so that when electrical connection is made from a mainiswitchtoqthe pointer on an auxiliary switch a simultaneous connection will be "made that will move such pointer to a new position.

.17. In a telephone exchange, a series of main switches eachof which 1s-individual to a'co'nnected' telephone, a lesser series of aux- I iliary switches eachof'which is common to alltelephones in the exchange,la-pointer and, a group of contact devices on each auxiliary switch, a secondpointer on eachma'in switch and means formoving it to electrical con nection witbgthe pointer of any one of the auxiliary switches, a magnetion each "auxil-Q '95 ing series or auxiliaryfswitches each of themagnet ior moving such pointer to the *correspondmg contact point on the other series of contact points, a double armedv y iary switch-for moving its pointer into elec' trical connection with anycontact device of the group thereon, and a second magnet for any telephone in the exchange.

18.'Ina telephone exchange, a series of main switches each of which is individual for a connected telephone, a-lesser series of auxiliary switches each of which is common movmgthe group of contact devices so as to extend. the connection from'said pointeretofl zt -main switch when it reaches electrical con-- for all telephones, a pointer on each auxil iary switch, a magnet for moving it, devices on each main switch for moving it to electrical connections with the pointers of successive auxiliary switches, means for automatically stopping the movement of a moved nection with a pointer which is in normal position", and automatic means for sending an electrical impulse through such pointer and its operating magnet.

19. In a telephone exchange, a seriesof main switches each of which is individual for a connected telephone, a lesser series of auxiliary switches each of which is common for all telephones, a pointer on each auxiliary switch normally serving as an electrical connection "to a magnet for moving it, a magnet for so moving it so as to break such electrical connection, devices on each main switch for moving it to electrical connection with the pointers of. successive auxiliary switches, a magnet on each main switch for disconnecting the moving devices therefor, and means for connecting the magnet on a moved main switch in series with the magvnet of an auxiliary switch which has its pointer in its normal position. I

20. In a telephone exchange, a series of main switches each of which is individual for a connected telephone, a series ofauxiliary switches each of which common for all telephones, a pointer on each auxiliary switch normally serving as an electrical connection to a magnet for moving it, a magnet for so moving it so as to break such electrical connection, devices on each mam switch for moving 1t to electrical connections with successive pointers, means for sending an electrical impulse through a moved main switch and the first pointer resting in its' normal position so as to operate its magnet and break the circuit through which such impulse is sent, and means for sending other electrical impulses through the same magnet over other connections so as to advance the moved pointer to other electrical connec- 21. In a telephone exchange, a series of main switches each of which is individual for a connected telephone, a series of auxiliary switches each of which is common for cessive auxiliary switches, and means for all telephones, a contact closing magnet and an operating magnet on, each auxiliary switch, a pointer on each auxiliary switch normally in electrical connection with the contact closing. magnet and with an ope at ing magnet through the contact made by the other magnet, means for moving each main switch into electrical connections with the pointers and the operating magnets of sucsending an electrical impulse through a moved main switch and the operating mag net of the first auxiliary swltch whose coincident electrical connections with the pointers and their respective magnets of successive auxiliary switches; means for sending an electrical impulse through a main switch, the first pointer'resting in its normal position and the magnet for moving it whereby said pointer is moved so as to break the circuit through which said impulse is sent; and means for sending other electrical impulses through said magnet by the, other coincident electrical connection whereby the moved pointer may be advanced to make new electrical connections.

23. 1n an auxiliary switch adapted to be used by any telephone in a telephone exchange, a pointer and a series of contact points therefor, a contact closing device and a magnet foroperating it, an electrical connection from the normal contact point to one side of the contact closing device and to the magnet for operating it, a second magnet for moving said pointer and a connection from said magnet to the other side of the impulse sent through said pointer will send another impulse through the operating magnet and thereby move the pointer so as to break its own circuit, and means for sending other electrical impulses through said .ries of. contact points on each auxiliary switch, a magnet for moving each'pointer, devices for moving a main switch-into si-' multaneous but independen't'electrical con-'- nections with the pointers and thei'r respe 'ctive magnets 'of successive auxiliary switches, means for sending'an electrical'impulse through a moved main switch to' the first pointer in itsnormalposition and the magnet for moving it so'that the circuit'for said impulse will be brokenfmeans for ad, vancing a moved pointer so'as to complete a new circuit throughsaid pointer, a second magnet located in the new circuit, a series of ,contact devices moved by the" second magnet, and means'foragainadvan'cing said moved pointer. so as to make electrical -'connections to any one of said contact devices.

25. A series of contact devices, aplurality of corresponding series of contact points, means for moving the series of contact de- 'contact closing device whereby an electrical v

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