US1445421A - Telautographic system - Google Patents

Description

Feb. 13, 1923.

G. S. TIFFANY TELAUTOGRAPHIC SYSTEM Patented Feb. 13, 1923.

UNITED STATES PATENT OFFICE.

GEORGE S. TIFFANY, OF SUMMIT, NEW JERSEY, ASSIGNOB TO TELAUTOGBAPH COR- PORATION, OF RICHMOND, VIRGINIA, A CORPORATION OF VIRGINIA.

TELAUTOGRAPH IC SYSTEM.

Application filed July 25, 1916, Serial No. 111,102. Renewed July 7, 1922. Serial No. 573,457.

To all whom it may concern:

Be it known that I, GEORGE S. TIFFANY, a citizen of the United States, residing at Summit, county of Union, and State of New Jersey, have invented certain new and useful Improvements in Te'lautographic Systems, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to a composite telautograph and telephone system, that is to say, a system in which telautographic and telephonic messages may be simultaneously transmitted over the same line wires without interference between the telegraph and telephone apparatuses. A combined system of this character is useful generally. ()ne use to which it is specially applicable is that of train dispatches. For convenience the improvements constituting the resent invention will be shown and described as applied to such use. It is to be understood, however, that the invention is not so limited.

In the accompanying drawing Figure 1 represents diagran'imatically a composite telautographic and telephonic system embodying the present invention, and

Figure 2 represents graphically the character of the pulsatory or vibratory currents in the main line currents produced by the means provided therefor by the present invention.

Referring to said drawings, A represents a train dispatchers station, equipped, as hereinafter more fully described, with a telephone group A and with a telautographic receiver A while B, C, re resent two sub-stations, each equipped, as ereinafter more fully described, with a telephone group B, C, respectively.

If desired, train dispatchers station A may also be equipped wlth a telautographic' transmitter, and sub-stations B, C, may also be equipped with te lautographic receivers. In a train dispatching system however, such additions are unnecessary for the reason that the use of telautographic apparatus in such a. s stem is sim. ly to provide means for sen ing a tangi 1e re tition in writing, from sub-S ations to t edispatchers station, of the orders as received by the former from the latter, so that if there are errors in an order as received at a sub-station, they may be instantly discovered and corrected by the train dispatcher, or if an operator at a sub-station does not follow an order as received by him the fact may readily be established by consulting the telautograpic record thereof as transmitted by him to the train dispatcher.

1, 2, indicate two main line Wires, over which the telautographic and telephonic apparatus of each station may simultaneously operate, as hereinafter more fully described. The telephonic apparatus shown at each station is of a well known kind, and for this reason, and for the further reason that the present invention is independent of any particular form of telephonic apparatus, no detailed description of such telephonic ap paratus is necessary, the following description of operation being sufiicient for an understanding of the present invention. Normally the receivers 3, 3", 3 and hooks 4, 4 4 occupy the positions shown in group C; that is to say, with the receivers hung up on their respective hooks, so as to hold the latter in their depressed positions. With the parts in this position neither of the telephone groups B, C is in circuit with telephone group A excepting their bell magnets 5", 5, which, in series with condensers 6 6 are bridged across main line wires 1, 2 by circuit connections which will presently be referred to. The functions of condensers 6", 6 will be later on referred to.

When the train dispatcher at station A desires to communicate with the operator at sub-station B or C he will turn the crank of magneto 7, thereby sending alternating currents therefrom through bell magnets 5", 5; the sub-station with which he wishes to communicate being selected by him through a predetermined-number of rings, as in the case of the ordinary telephone party wire. The circuit in such case through the bell magnet 5 comprises wire 8, main line wire 1, wires 9", 10", bell magnet-5 wire 11", contact 12", wires 13", 14", condenser 6", wire 15", main line wire 2, and wires 16, 17 to magneto 7 The circuit connections dispatcher will from main line wire 1 through bell magnet 51 and thence to main line wire 2 are similar and for that reason such connections bear the same reference numerals as those just referred to for bell magnet 5. except that they are followed by the reference letter c. If the operator at sub-station B be the one called by the train dispatcher he will unhook receiver 3 and receive the order transmitted to him telephonically by the train dispatcher. who in the meantime has of course unhooked the receiver 3 of telephone group A. lVhen receiver 3 of telephone group B has thus been unhooked, the hook 4 will move out of engagement with contact 12" thereby breaking the circuit just described through bell magnet 5 and at the same time, by engagement with a pair of contacts 20 and 21". closing other circuits through the transmitter 22 and the receiver 3 The circuit thus closed through the t'ansmitter consists of wire 24 from the positive pole of a local battery 25", transmitter 22 wire 26", and the primary winding 27 oi an induction coil 28". wires 29", 13, contact 20". hook 4". and wire 31 to the negative pole of battery 5". The circuit thus closed through receiver 3 consists of magneto 7, wire 8, main line wire 1, wires 9", 32 receiver 3". wires 33 34, contact 21*, hook 4", wires 13 14, condenser 6", wire 15", main line wire 2 and wires 16, 17, back tomagneto 7. The sec ondary winding 35" of the induction coil 28 is bridges across the receiver 3*, as usual, by wires 36 37". The circuit connections for the transmitter and receiver of telephone group are similar to those just stated for group B and for that reason they bear the same reference numerals, followed. however. by reference letter 0.

VVit-h the connection thus established over main line wires 1., 2, between the train dispatchers telephone group A, and the telephone group B at sub-station B, the train transmit his orders in the usual way to the operator in charge of substation B, who will repeat them over the telephone to the train dispatcher. A simple telephonic repetition of the order, however, is unsatisfactory, because of the liability of errors in the train dispatchers understanding of the repetition and also because no tangible record is made by the operator at the sub-station and submitted by him to the train dispatcher to verify and with which to fix the blame for errors subsequently made in the carrying out of orders.

It is the object of the present invention to provide means whereby such a tangible record may be made and to do so by combinmg telautographic apparatus with the train dispatchers station and the substatlons, such. telephonic apparatus being operable simultaneously with the telautographic apparatus of said stations over the main line wires 1, 2. Sucha combination of telephone and telautographic apparatus presents certain difficulties, having to do with interference of one apparatus with the proper working of the other due to the fact as they both operate simultaneously over the same main line wires the one is liable to produce disturbance in the other seriously affecting its proper working. This is particularly true of telautographic appzv ratus in its effect on telephonic apparatus which is very sensitive and readily affected by very feeble alien currents especially if they be of a pulsatory or vibrator nature and of a musical pitch, as may be the case with telautographic currents. Such combination of telautographic and telephonic apparatus is. however, effected by the present invention in such a way as to do away entirly with these difficulties.

As before indicated train dispatchers station A is equipped with a telautographie receiver but no transmitter, while each of the sub-stations B, C, is equipped with a transmitter but no receiver; As the transmitting apparatus of sub-stations B C are identical, a description of one, with the receiving apparatus of the train dispatchers station A, will be sufficient; corresponding reference numerals being applied to both telautographic transmitting apparatus, followed in the case of apparatus C by the reference letter a. Selecting the telautographic transmitting apparatus B the source of electric energy therefor, as well as for transmitting apparatus C and the receiving apparatus A is a generator 40 located at station A. The apparatus B is provided with the usual transmitting tracer 41 freely mounted in the a pair of arms 42, 43, which are ,pivotally connected in the usual way with a pair of pivotally mounted levers 44, 45, bearing at their free ends a pair of contacts 46, 47, coacting with a pair of rheostats 48, 49, respectively. The receiving apparatus A is provided with the usual receiving pen mounted in arms 50, 51, pivotally connected with a pair of pivotally mounted levers 52, 53, hearing at their pivoted ends a pair of segments 54, attached by links 56, 57, to a pair of endwise movable current responsive members or coils 58, 59, slidably mounted on the core 60 of a magnet 61 in the well known way. Receiver A is also equipped with the usual pen. lifting magnet 62 controlling the movement of the pen. to and from its writing surface; the movement of the pen laterally. or transversely of its writing surface, as in writing, being controlled by the coils 58, 59, as is well underconverging ends of push rod 65, controlling a pair of contacts 66, 67 which in turn control the making and breaking of the main line circuits from generator 40 through the transmitting and receiving apparatus B A. lVhen rod and these contacts 66, 67, are in their normal position (see the telautographic apparatus C the transmitting apparatus and receiving apparatus A are disconnected from the generator 40. \Vhen the rod 65, w th contacts 66, 67, is moved to the position in which it is shown in apparatus B transmitter B and receiver A are connected with generator 40 by circuits including the main line wires 1, 2, before referred to. These circuits are as follows: The left hand circuit consists of wire 68 from the positive pole of generator 40, wire 69, winding 70 of an induction coil 71, wires 72, 73, endwise movable coil 58, wires 74, 75, neutral relay 76, one of the twin windings of a coil 77, wire 78, main line wire 1, wire 79, one of the twin windings of another coil 80, wire 81, contact 82, contact 66, wires 83, 84, lever 44, contact 46, rheostat 48, wires 85, 86, 87, resistance 88, wire 89, to ground at 90 and thence to ground at 91 and by resistance 92 wires 93, 94, and to the negative pole of generator 40. The right hand circuit consists of wires 68, 69, from the positive pole of generator 40, winding 70, of induction coil 71, wire 72, wires 95, 96, right hand endwise movable coil 59, wires 97, 98, 99, the other twin winding of coil 77, wire 101, maln line w re 2, wire 102, the other twin winding of coil 80, wire 103, contact 104, contact 67, wire 106, lever 45, contact roller 47, rheostat 49, wires 107, 108, 87, induction resistance 88, and wire 89 to ground at 90, and thence I to ground at 91 and through induction res stance 92 and wires 93, 94, to the negat ve pole of generator 40. The functions ,of induction coil 71 and of coils 77, 80 and 80 will be stated later on.

The push rod 65 will be moved to the position above referred to, that is tosay, to engage contacts 66, 67, with contacts 82, 104, respectively, when the operator at sub-station B has received an order telephonically from the train dispatchers station A and is ready to repeat such order telautographically to the dispatchers station for verification by the train dispatcher and filing away for possible subsequent'reference. As in the use of the ordinary well-known telautographic apparatus the operator at sub-station B will trace the order received by him on the usual writing platen 110, by means of the tracer 41. The movement of this tracer laterally, as in an ordinary writing operation, will produce corresponding movements of the contacts 46, 47 lengthwise of the rheostats 48, 49, with the result that, according to the direction and extent of movement of such contacts, the currents traverse ing the left and right main line circuits, including main line wires 1, 2, from generator 40, will be increased or decreased in strength. As the current is increased in strength on the left or right main line the current responsive member or endwise movable coil 58 or 59, as the case may be, will be moved inwardly along the core 60 of magnet 61, against the tension of the usual spring (not shown) which opposes such movement and which. as the current decreases in strength, will move the coils 58 or 59, as the case may be, in the opposite direction. The result of these movements of the coils 58, 59, is that, through the connections between them. and the receiving pen 111, the receiving pen will be caused to reproduce the writing movements, and there fore the writing, of the transmitting tracer 41. Such operation of telautographic apparatus is so well known and understood that further description thereof in the present case is unnecessary.

If the variations in the strength of the currents traversing the main linesof a telautographic apparatus were the only condit1ons to be considered in a contemplated combination ofsuch an apparatus with a telephone apparatus, the combination of the two, so that they could operate simultaneously over common lines, would be comparat-ively easy of accomplishment. In the practical operation of telautographic apparatus, however, other current conditions have to be considered, which present serious difliculties in the way of such combination. The other conditions here referred to are vibratory conditions on the main lines which are used for controlling the movements of the receiving pen to and from its writing platen as the transmitting tracer is So moved with relation to its platen, and also for other purposes. The means provided in the present case for producing these vibrations in the main line currents have been devised with especial reference to the combination of the telautograph with telephone apparatus. They include the usual induction coil 71 heretofore referred to and a motor 112 for inducing therein currents of opposite. polarity. For this purpom the motor 112 is included in a branch circuit, from the positive pole of generator 40, consisting of wires 68, 113, contact 114, armature 115 of relay 76, wire 116, the windings of motor 112, and wires 117,- 118, 94, to the negative pole of generator 40. Relay 76 is included in the left mainline circuit between transmitter B and receiver A, which circuit is closed, as before indicated, by the engagement of contact 66 with contact 82. The closing of this circuit energizes relay 76, the armature 115 of which is then moved into engagement with contact 114, so as to close the branch circuit through motor 112 and start the latter, In this position of armature 115 the following branch circuit is also closed from generator 40 through penlifting magnet 62: wires 68, 113, contact 114, armature 115, wire 120, magnet 62, wire 121. the usual pair of loose contacts (not shown) in a tube 122 secured to the armature of a rela 123 (included in a shunt circuit hereina ter described) and wires 124, 93, 94, to the negative pole of generator 40. The energization and de-energization of magnet 62 are effected by the conditions, as to strength, of the vibrations. set up in the main. lines by motor 112, as will appear later on.

The rotating armature of motor 112 is provided with a contact 125 connected by wires 126, 116, armature 115, contact 114, and wires 113, 68, with the positive pole of generator 40. Contact 125 is designed to successively engage in rapid succession a pair of contacts 127, 128, and thereby successively close and break the following branch circuits; contact 125, contact 127, wire 129, primary winding 130, of induction coil 71, and wires 131, 118 and 94 to the negative pole of generator 40, and contact 128, wire 132, primary winding 130 of induction coil 71, and wires 131, 118 and 94 to the negative pole of generator 40. The effect of the currents traversing these two circuits, as successively closed by contact 125, is to magnetize the core of induction coil 71 with altern-ately opposite polarities and thereby induce corresponding currents in the secondary winding of induction coil 71, and therefore on the left and right main line circuits between the transmitter 13 and receiver A The pulsato-ry or vibratory currents traversing the main lines are retarded by the inductive resistances 88, 92. While the transmitting tracer 41 is raised from its writing platen 110 the retardation is greatest, due to the fact that then these currents are retarded by both resistances. The vibrations then on the main lines are relatively weak. In this position of writing platen 110 transmitting tracer 41 is raised, away from its writing surface. When, however, the tracer 41 is lowered to and rests upon its writing platen, thereby depressing it, the latter will engage a contact 135 and thus close a shunt circuit around resistance 88, consisting of wires 136, 137, and including a condenser 138, through which the pulsato-ry currents may readily pass. The interposition of condenser 138 into the main lines hasthe effect of increasing, in strength, the vibrations on the main lines. a s

The following states the reason for thus varying, in strength, the vibrations traversing the main lines. It will be noted that relay magnet 123, which, through the loose contacts in tube 122, controls the energization and deenergization of pen-lifting magnet 62, is included in a shunt circuit, as fol? lows, around inductive resistance 92; wires 140, 124, resistance 92, wire 141, condenser 142, wire 143, relay 123. The function of inductive resistance 92 is to retard the passage of the pulsatory currents, while permitting the free passage of the direct or writing currents. The function of the shunt circuit and condenser 142 is to permit the passage of the pulsatory currents through relay 123 while preventing the passage therethrough of the writing currents. Therefore, under all conditions of the induced currents traversing the main lines, that is to say, whether the transmitting platen 110 be up or down, part of such in uced currents, '(but none of the writing currents) will traverse this shunt circuit through relay magnet 123. When the transmitting platen 110 is up and the vibrations on the main lines therefore relatively weak, the effect of magnet 123 upon the loose contacts in tube 122 will be such as not to disturb their engagement with each other so that the branch circuit of which they form part and which passes through pen lifting magnet 62 will remain closed and said magnet continued in an energized condition, supporting receiving pen 111 away from its writing platen. When, however, platen 110 is depressed, these vibrations will be increased in strength by the shunting of condenser 138 around resistance 88, thereby greatly reducing the effective resistance of the main lines to the passage of the induced currents. The vibrations, thus strengthened, will rapidly vibrate the armature of relay 123 and thereby produce such a rapid vibration of the loose contacts in tube 122, with relation to each other, that the current, traversing the circuit of which they form part and which passes through penlifting magnet 62, will be materially weakened, with the result that magnet 62 will be practically deenergized and thus permit re- ;eiving pen 111 to move to its writing surace.

All danger of serious interference, by the pulsatory currents traversing the main line wires 1, 2, with the telephone receivers 3*, 3, which, in series with condensers 6 6, are each bridged across the main lines, is avoided by reason of the fact that these currents traverse both main lines in. the same direction and meet with but little, if any, retardation from coils 80, 80*, and by reason of the further fact that they traverse the windings of these coils in such direction relatively to each other as to tend to maintain them in a magnetically neutral condition.

It will also be noticed that the rheostats 48, 49, are shunted by condensers 150, 151, which are of high capacity and practically annul the effect of the resistance of the rheostats upon the pulsatory currents. The moving coils 58, 59, are also shunted by condensers 152, 153, which practically eliminate opposite direction.

these coils from the circuits as regards the pulsatory currents.

With this arrangement of condensers the two main line circuits may be well balanced inductively in relation to each other and as the telephone instruments are bridged across the two main line wires they will be substantially unaffected by the pulsatory currents because the difference of potential between these wires will be practically zero at all times as re ards the pulsatory currents.

It will also )e seen that while the coils 77, 80, 80 offer little inductive resistance to the pulsating or other currents, which traverse both line wires in the same direction, they will have their maximum inductive effect in opposing thetelephone currents since these currents will traverse one line wire in one direction and the other line wire in the These coils 77, 80, 80 will thus act to prevent the telephone currents from leaking to earth through the telautograph apparatus and will thus increase the efficiency of operation of the telephone.

Although the above arrangement of circuits, etc., will permit of the operation of the telephone while pulsatory or vibratory currents are traversing the ine wires, yet the practical difficulties in the way of securing and maintaining a perfect inductive and resistance balance between both line circuits, whereby all disturbances in the telephone circuits are avoided, make it necessary to utilize a pulsatory current having characteristics which have the leasteffect upon the telephone circuits.

It is well known that of vibrating currents having the same value, those which vibrate at a musical pitch produce a much more noticeable sound in a. telephone receiver than those currents which vibrate at a frequency below the musical pitch.

Consequently in order to produce the least disturbance in the telephone circuits of a composite telephone and telautograph system, the telautograph. vibratory currents should be of a low pitch.

Unfortunately the telautograph pen lifting relay 123, which is actuated by the vibrating currents referred to, is much more sensitive to currents of a high pitch.

The current interrupting motor 112 is provided to overcome this difficulty and'it does so without the use of heavy vibrating currents, which would cause the receiving pen to vibrate excessively. As its armature rotates the projection 125 thereon will engage contacts 127, 128, in quick succession on each revolution of the armature, thus causing plus and minus impulses to traverse the main line wires in quick succession, as illustrated in Figure 2. Assuming that the armature rotates fifteen times per second it will be evident that 15, groups of double impulses will traverse the line wires per secstrength, but because of the lowness of the pitch the amount of disturbance produced is not objectionable.

What I claim is:

1. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines, current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receivin pen, means for producing pulsations in tEe currents traversing the main lines, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines, substantially as described.

2. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and includin means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines, current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the currents traversing the main lines, a telephone transmitter at one station and a telephone receiver at the other and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines and including a con denser, substantially as described.

3. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines, current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the'currents traversing the main lines, inductive resistance means in the main lines for weakening such pulsations, a shunt circuit, around such resistance means, controlled by the transmitter platen, for strengthening such pulsations, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines, substantially as described.

4. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversingthe main lines, current-responsive members at the receiver cont-rolled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsa tions in the currents traversing the main lines, inductive resistance means in the main lines for weakening such pulsations, a shunt circuit around such resistance means, including a condenser, and controlled by the transmitter platen, t'o-r strengthening such pulsations, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines, substantially as described.

5. The combination with a telautographic transmitting station and a tel'autographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the trans mitter and receiver and including means for inductively resisting the passage of the telephone currents through the. telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines,

current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the currents traversing the main lines, inductive resistance means in the main lines for weakening such pulsations, a shunt circuit around such resistance means, controlled by the transmitter platen, for strengthening such pulsations, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines and including a condenser, substantially as described.

6. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines, current-responsive members at the receiver controlled bysuch variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the currents traversing the main lines, inductive resistance means in the main lines for weakening such pulsations, a shunt circuit around such resistance means, controlled by the transmitter platen, for strengthening such pulsations, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines and including a condenser. substantially as described.

7. The combination with a telautogiaphic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines, current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the currents: traversing the main lines, an inductive resistance in the main lines, associated with the transmitter, for

weakening such pulsations, a shunt circuit around such resistance, controlled by the transmitting tracer, for strengthening such pulsations, another inductive resistance associated with the receiver, a shunt circuit around said resistance, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines, substantially as described.

8. The combination with a telautograph c transmitting station and a telautograph c receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines, current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the currents traversing the main lines, an inductive resistance in the main lines, associated with the transmitter, for weakening such pulsations, a shunt circuit around such resistance, including a condenser, and controlled by the transmitting tracer, for strengthening such pulsations, another inductive resistance associated with the receiver, a shunt circuit around said resistance, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines, substantially as described.

9. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines. current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the currents traversing the main lines, an inductive resistance in the main lines, associated With the transmitter, for weakening such pulsations, a shunt circuit around such resistance, controlled by the transmitting tracer, for strengthening such pulsations, another inductive resistance associated with the receiver, a shunt circuit around said resistance, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines, and including a condenser, substantially as described.

10. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer for varying the strength of the currents traversing the main lines, current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the currents traversing the main lines, an inductive resistance in the main lines, associated with the transmitter. for weakening such pulsations, a shunt circuit around such resistance, including a condenser, and controlled by the transmitting tracer, for strengthening such pulsations, another inductive resistance associated with the receiver, a shunt circuit around said resistance, a telephone transmitter at one station and a telephone receiver at the other. and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines and including a condenser, substantially as described.

11. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines, current-responsive member-sat the receiver controlled by such variations and in turn controlling the lateral n'ioveinents of the receiving pen, means for producing pulsations in the currents traversing the main lines, an inductive resistance in the main lines, associated with the transmitter, for weakening such ulsations, a shunt circuit around such resistance, controlled by the transmitting tracer, for strengthening such pulsations, another inductive resistance associated with the receiver, a shunt circuit around such resistance, a relay controlled by such pulsations, a pen-lifting magnet controlled by the relay, a shunt circuit for such relay around said other resistance, a telephone transmitter at one station and a telephone-receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridges across the main lines, substantially as described.

12. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral'movements of the transmitting tracer, for varying .the strength of the currents traversing the main lines, current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the currents traversing the main lines, an inductive resistance in the main lines, associated with the transmitter, for weakening such pulsations, a shunt circuit around such resistance, controlled by the transmitting tracer, for strengthening such pulsations, another inductive resistance associated with the receiver, a shunt circuit around said resistance, a relay controlled by such pulsations, a penlifting magnet controlled by the relay, a circuit for such relay bridged around said other resistance and including a condenser, a. telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines, "substantially as described.

13. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines, current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the currents traversing the mam the main lines and lines, an inductive resistance in the main lines, associated With the transmitter, for weakening such pulsations, a shunt circuit around such resistance, controlled by the transmitting tracer, for strengthening such pulsations, another inductive resistance associated with the receiver, a shunt circuit around said resistance, a relay controlled by such pulsations, a pen-lifting magnet controlled by the. relay, a shunt circuit for such relay around said other-resistance, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across including a condenser, substantially as described.

14. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines, current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the currents traversing the main lines, an inductive resistance in the main lines, associated with the transmitter, for weakening such pulsations, a shunt circuit around such resistance, controlled by the transmitting tracer, for strengthening such pulsations, another inductive resistance associated with the receiver, a shunt circuit around said resistance, a relay controlled by such pulsations, a pen-lifting magnet controlled by the relay, a shunt circuit for such relay around said other resistance including a condenser, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines and including a condenser, substantially as described.

15. The combination with a telautographic transmitting station and a telauto graphic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines, current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the currentstraversing "the main lines, inductive resistance means in the main lines for weakening such pulsations, a shunt circuit around such resistance, controlled by the transmitter platen, for strengthening such pulsations, condensers bridged across the current-strength-varyingmeans at the transmitter and the currentresponsive members at the receiver, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines, substantially as described.

16. The combination with a' telautographic transmitting station'and a telautographic receiving station, of a source of electricenergy therefor, main lines from one pole thereof connectin corresponding sides of the transmitter an receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines, current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, means for producing pulsations in the currents traversing the main lines, inductive resistance means in the main lines for weakening such pulsations, a shunt circuit around such resistance, controlled by the transmitter platen, for strengthening such pulsations, condensers bridged across the current-strength-varying means at the transmitter and the current responsive members at the receiver, a telephone-transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines and including a condenser, substantially as described.

17. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer. for varying the strength of the currents traversing the main lines, current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, an induction coil with one winding in the main line and the other connected with the pole of the source of energy opposite that connected with the main lines and provided with two terminals, arranged one in advance of the other. a motor provided with a rapidly rotating contact for successively engaging said terminals in rapid succession on each revolution and producing pulsations in quick sue cession on the main lines, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines and including a condenser, substantially as described.

18. The combination with a telautographic transmitting station and a telautographic receiving station, of a source of electric energy therefor, main lines from one pole thereof connecting corresponding sides of the transmitter and receiver and including means for inductively resisting the passage of the telephone currents through the telautographic apparatus, means at the transmitter, controlled by the lateral movements of the transmitting tracer, for varying the strength of the currents traversing the main lines. current-responsive members at the receiver controlled by such variations and in turn controlling the lateral movements of the receiving pen, an induction coil with one winding in the main lines and the other connected with the pole of the source of energy opposite that connected with the main lines and provided with two terminals arranged one in advance of the other, a motor provided with a rapidly rotating contact for successively engaging said terminals in rapid succession on each revolution and producing pulsations in quick succession on the main lines, a circuit for said motor and meanscontrolled by one of the' main lines for opening and closing it, a telephone transmitter at one station and a telephone receiver at the other, and circuit connections from the former to the latter, including the main lines, with the connections from the telephone receiver bridged across the main lines and including a condenser substantially as described.

19. In a combined telautograph and telephone system, a telautograph transmitting instrument, a telautograph receiving instrument. two main line wires connecting said transmitting and receiving instruments, a source ofdirectcurrent connected with said main line wires, whereby a continuous current flows over both said line wires tl'iroughout the time of writing operation of said telautograph instruments. means controlled by said transmitting instrument for varying the strength of said continuous line current in accordance with the-extent of movement of the transmitting tracer whereby the extent of movement-of 5 the receiving tracer is determined, means for pulsating sald contlnuous current for the purpose of raising or lowermg said receiving tracer,- said pulsations occurring simultaneously and ofequal value-in 0th line wires, and tele hone instruments .coulo pled inductively wit said line wires. In testimony whereof, I have hereunto set GEORGE s'. TIFFANY.

my hand.

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