US1066148A - Printing-telegraph system. - Google Patents

Description

F. B. RAE.

PRINTING TELEGRAPH SYSTEM. APPLIOAIIONTILED 111N230, 1910.

Patented July 1,1913.

2 SHEETS-SHEET 1.

F. B. RAB.

PRINTING TELEGRAPH SYSTEM. APPLICATION FILED JUNE 39, 1910.

1,066,148, Patented July 1, 1913.

-2 SHEETS-SHEET 2.

QMM m g 7m COLUMBIA PLANOGHAJH 60.. WASHINGTON, D. c.

barren s'rarns PATENT OFFICE.

FRANK B. RAE, OF GLEN RIDGE, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGNMENTS, TO NEW BURLINGAME TELEGRAPHING TYPEWRIIER COMPANY, A CORPORATION.

PRINTING-TELEGRAPH SYSTEM.

occnae.

Application filed June 30, 1

To all whom it may concern.

Be it known that I, FRANK B. RAE, a citizen of the United States, residing at Glen Ridge, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Printing- Telegraph Systems, of which the following is a full, clear, and exact specification.

This invention relates to printing telegraph systems, and particularly to printing telegraph systems in which the message is transmitted and received by means of a telegraphic typewriter.

This invention relates also to the method of transmitting communications by manually causing electric energy to be transmitted in certain forms and under certain conditions over the line and producing at the receiving station the communication in a printed form.

One object of this invention is to simplify the apparatus employed in printing telegraph systems heretofore proposed, and to siinplify the method of transmitting the electric energy over the line and for producing the printed embodiment of the message transmitted.

A further object of this invention is to. secure a transmitting apparatus and receiving apparatus which will be more reliable in operation, and which will not require the use of synchronizing devices, or the like.

A further object of this invention is to devise a method of transmitting electric energy in such form and under such conditions, and preferably independent of the instants at. which the current normally passing over the line reaches its maxim and minim values, so that the electric energy transmitted to the receiving station will properly select the letter or character, or other designation, and produce a printed embodiment of the message desired to be communicated.

In accordance with my invention, a source of current of alternating potential is substantially continuously maintained in electrical connection with the line, and the potent-ial of the alternating current thus passing over the line is modified or varied when the telegraphic typewriter is manipulated by the operator, such modifications or varia tions of the alternating current causing the receiving telegraphic typewriter to produce the message in a printed form.

Specification of Letters Patent.

Patented Jul3 1, 1913.

910. Serial No. 569,801.

More specifically, this invention embodies a telegraphic typewriter having a movable type-wheel, a source of alternating current of a constant potential normally connected to the line, such connection being preferably effected by means of a potential modifying device, such as a transformer, an electromagnetic means for normally moving the type-wheel of said typewriter, the movement of said type-wheel being interrupted in certain positions of its path dependent upon the key struck by the operator, that is, upon the letter, character or other designation desired to be transmitted, means whereby the potential of the alternating. current passing over the line is varied or modified when a key is manipulated, and a receiving instrument similar to the transmitting typewriter, and responsive to such modifications or variations of potential for selecting the proper letter or character or other designation constituting the message desired to be communicated.

Other objects and features of my invention will be fully understood from the following description and the accompanying drawings, in which- V Figure 1 is a diagrammatic view of the electrical connections of a transmitting or receiving device embodying my invention,

with portions thereof shown in sectional elevation, and indlcating a method .of carrying out my invention; Fig. 2 is detail view in.

elevation taken on the line A-A of Fig. 1; Fig. 3 is a detail view in elevation ofthe rectifying or alining disk of my typewriter; Fig. 4 is a front elevation of the electro magnetic device formoving the type wheel of my telegraphic typewriter and for electrically interrupting the movement of said type wheel at certain positions; Fig. 5 is a side elevation of the device shown in Fig. 4; and Fig. 6 is a detail view showing the arrangement of the ratchet wheel, the escapement wheel and the shaft of the device shown in Figs. 4 and 5.

Referring to the drawings, the key 1 represents a single key of a bank of keys of the transmitting or receiving typewriter. The bar of each key is pivoted in any approved manner,a-nd adapted to engage a bell crank 2. The bell cranks 2 are arranged to engage the pin in the pin-frame 3 corresponding to the letter or number of the bell crank actuated, as is more fully explained hereinafter. The pin frame 3 comprises two circular end plates 4, 5, provided with registering recesses arranged at or near the peripheries of the same. Pins 6 are disposed in each set of corresponding recesses in said front and back end plates 4, 5, each pin 6 being provided with a spring 7 and collar 8 for normally holding said pin 6 so as to project forward. The shaft 9, usually disposed horizontally, is journaled in a bearing 10 in the pin-carrying frame 3, and in a bearing 11 secured to a fixed part of the typewriter, such as the upright 12. Fixed to, but insulated from, the shaft 9 is a finger or arm 13 having a collar 14. The finger 13 is mounted so as to normally clear the rear ends of the pins 6. The shaft 9 is driven by the polarized electromagnet 15, having two sets of coils 16, 17. Said magnet 15 is provided with a G-shaped magnet 18. The

coils 16 and 17 are mounted on the U-shaped.

laminated core 19 so that-when an alternating current passes over the line the polarity of said coils 16 is respectively alternated.v Pivoted on a pin 19 projecting from one of the poles of the G-shaped magnet 18 is an 26. The ratchet wheel 26 is loosely mounted on the shaft 9 by the coil spring 27, as shown in Fig. 1, whereby the ratchet wheel willI move a limited distance with respect to the yoke 21 is so. proportioned that each feed tooth 25 feeds the ratchet wheel 26 at each stroke a distance of one half of a complete tooth on said; ratchet wheel 26. The escapement wheel 28 is rigidly fixed to the shaft 9, and is pro-3 vided with a number of teeth dependent upon the number of characters or designations on the type-wheel or type-wheels. The: pallets 22, 22 cooperate with the escapementv wheel 28, so that each complete oscillationof the yoke will allow the ratchet wheel 26 shaft 9. The throw of the to be moved a distance of a complete tooth.

In Figs. 4, 5 and 6, I show the pallets 22" secured to an oscillating bent arm 48 piv oted to a fixed part of the instrument, the; arm 48 being oscillated by the yoke 21 bythe link 49. The ratchet wheel 26 may be loosely mounted on the shaft 9 by means of a fiat spring 27 bent upon itself, having its bent end secured to the shaft 9 and one of the other ends abutting a pin 29 on the ratchet wheel 26. The type disk or wheel 30 is mounted at one end of the shaft 9 and secured thereto so as to provide movement of said disk 30 at an angle to said shaft 9 for shifting said type wheel 30 toward the platen 31. Preferably, I secure said type disk 30 to said shaft 9 by a ball and socket, or universal joint 31. The type disk 30 is secured to a stud 32, said stud being journaled in the movable bearing 33. Preferably, bearing 33 is mounted in a fork 34, having a stem 35 passing through suitable openings in the bracket 36 secured to any fixed part of the typewriter. The stem 35 is provided with a collar 37 and spring 38 so as to normally hold said stem 35 upward to bring the stud 32 in axial alinement with the shaft 9. The type on the typewheel or disk 30 representing letters, characters and other designations are disposed radially on one face of the wheel 30 adjacent the platen 31. Secured to the type wheel 30, preferably to the hub thereof, is an alining or rectifying disk 39 having a number of peripheral slots 40, see Fig. 3. The lug 41, secured to any fixed part of the typewriter, cooperates with the disk 39 in rectifying the movement of the type wheel 30 toward the paper on the platen 31. These slots 40 are preferably wider at their opening on the periphery of the disk 39, the inner width being substantially the same as the width of the alining lug 41. The positions of the slots on the alining or rectifying disk 39 correspond to the positions of the type on the type wheel 30.

As one means for shifting the type wheel 30 toward the platen 31, I employ an electromagnet 45, or press magnet, connected to the line, said magnet- 45 being provided with an L-shaped laminated core 46, and an armature member 47 pivoted on one end of said core 46, said member 47 being extended to engage the foot piece 48 of the stem 35. Any resilient medium, such as the spring 49, having one end attached to said armature member 47 and its other end secured to a fixed part, such as the non-magnetic bracket 50, will serve to normally hold the armature 47 out of engagement with the stem 35, and to permit the press magnet 45, when the po tential on the line is varied, to move the armature 47 and thereby trip the stem 35 and shift the type wheel 30 to print on the paper on the platen 31. It will be understood that the press magnet 45 need not itself be connected to the line, but may be excited to move the armature member 47 through the interposition of a relay and additional circuit.

The source of alternating potential is indicated as slip rings of a generator 55, though, of course, any other source may be employed, such as a transformer, or the like. The leads 56, 57 from the source 55 are connect-ed to a potential changing device, indidated as a stepnp transformer 58, having its primary 59 connected to'said leads56, 57. The secondary 60 provides for two dilfer'ent potentials, the tap 61 being intermediate the extreme terminals 62, 63. Said intermediate terminal til is connected to the back stop contact 6 1 of the relay 65, and the relay air-manages is connected to ground, the armature 66 being normally held against the back stop contact 64: by resilient means, such the adjustable spring One extreme terminal, as terminal 62, is connected through the switch 68 to the coils 16 of the electroinag'net 15, and thence to the line. Thus, normally the line is connected to ground thi-ongh the coils 16, a portion of the secondary 60 of the transformer 58, the back stop-contact. 64, relay arnia'tur'e 66, and the ground connector.

I provide means for varying the potential of the alternating current on the line when the keys of the transmitting instrument or typewriter are manipulated, and this result I effect by connecting each bell-crank 2 to the generaitor lead 56, and provide the arm or finger 13 with a brush 7 0 being connected to the coils 17 thence through the sending contact of the switch 51 to the sending relay coil 71 back to the other generator lead 57. It will be seen that when any key is manipulated the source 55 will energize the coils 17 and the relay coil 71. The excitation of the relay coil 71 causes the relay armature 66 to be moved into engagement with the front stop contact 7 2 which is connected to the remaining extreme terminal 63 of the transformer secondaryco, time; varying, or in the arrangement specifically illustrated increasing, the potential on the line circuitand increasing the magnetic flux excited by the coils 16. The coils 17 are so wound and arranged on the core 19 as to produce a mag netic flux which will counterbalance or neutralize the flax produced by the coils 16 during the time a key ofthe transmitting typewriter is operated, thereby electromagnetically interrupting the rotation of the shaft 9 and type wheel. 30. It will be seen that when the shaft 9 is mechanically interrupted, by operating a key of the typewriter, thereby mechanically arresting the movement of the shaft 9 by *a pin 6 contacting with the arm 13 at the same instant an electrical connection is made through such pin 6 with the arm 18 to excite the coils 17 to electromagnetically arrest the shaft 9, and to permit the press magnet 45 to shift the type wheel 30 to print on the paper on the platen 81. The release of a key of the transmitting typewriter permits the spring 7 to return such pin 6 out of engagement with the arm 13, deenergizing the coils 17 and permitting the coils 16 to rotate the shaft 9 and type wheel 30 under normal conditions. I

If desired any suitable unison device may be employed with the type wheel 30 to move the same to a predetermined initial position after each return of the type Wheel from the platen 31, as will be understood.

I provide for all the necessary designations usually required in reducing intelligence to a page-printed form. For example, the letter spacer of the typewriter is operated by the link 75 which is shown as connected to the extension of the armature 47 of the press magnet 45. For securing the proper line space, I employ a separate magnet 7 6 acting upon the line space lever of the typewriter, said magnet 7 6 being energized by connecting one end of its coil winding with a source lead 57, connecting the end of the other coil winding of magnet 76 to a contact 77 fixed on, but insulated from, the standard 12', electric connection being made with contact 77 by a contact 7 8 on the type wheel 30, when the latter is shifted, the circuit being completed through the metal shaft 9, bearing 11, standard 12 and a connection thence to the other generator lead 56. The magnet 79 for securing the return of the carriage of the typewriter is similarly connected to the source lead 57 in parallel to the line spacer magnet 76, and by means of the contact 80 fixed to, but insulated from, the standard 12, and the type wheel contact 81.

The receiving typewriter is similar in construction and arrangement to the transmitting typewriter, the switch 51 being moved to its receiving position, and the control switch 68 being moved to its receiving contact 82, which is connected to one end of the coil winding 83 of the receiving relay 84, the other end of winding 83 being connected to ground. The receiving relay 84 comprises further a relay armature 85 connected to the lead running from the brush 70 of the arm 13 to one terminal of the coils 17, and a front stop contact 86 connected by a lead to the source lead 56. An adjustable spring 87 is provided for the receivlng relay armature 85 to hold the latter against the back stop contact 88 when the normal potential of the line alternating current is passing through the receiving relay coil 83, that is when a key of the trans mitting typewriter is not being manipulated. hen said control switch 68 is thus moved to the receiving contact 82, the normal-line circuit is made through the coil of the press magnet 15, coils 16 of the shaftdriving magnet 15, and the receiving relay coil 88 to ground. When the potential of the line is increased, the greater excitation ioo of the receiving coil magnet 83 causes its armature 85 to make electrical connection with the front stop contact 86, whereupon one terminal of the coils 17 of the type wheel rotating magnet 15, will be connected with the source 55 through one source lead 56, the front stop contact 86, and the renecessary to effectthe object herein set forth. Such induction or capacity may be' employed alone, or may be supplemented by mechanical means.

I prefer to provide the sending relay armature 66 with'a jockey wheel compris ing a spring 52 fixed at one end and carrying a small roller 53 at its other end, which roller is adapted to assume its higher position on the bevel end of the armature 66 when the armature is in contact with its back stop cont-act 6 1, and to roll downward when the armature 66 is moved to engage its front stop contact 72. It will thus be seen that such jockey wheel will accelerate the movement of the armature 66 to reduce the interval of time required to effect the connection of the higher potential winding of the transformer 58 with the coils 16, and will retard the return of the armature 66 to the back stop contact 64. It will also be understood that the necessary time intervals will also be controlled by adjusting the parts of my device, such as the spring 7, springs 27, 38, 67, 49, as will be understood by those skilled in the art.

As indicated in the drawings, I may secure the variation of the potential of the line alternating current when a key of the transmitting typewriter is being manipulated, by increasing, preferably doubling, the normal line potential. When the po tential is thus doubled, the ta 61 will be at the middle of the secondary 60 of the transformer 58. It will of course be understood that the line return may be a separate metallic conductor instead of the earth. Any suitable frequency of the generator or generators will be chosen. For example, with say forty characters and spaces on the type-wheel, it will require forty complete cycles or alternations to make one revolution, and if the required speed of the type wheel be one hundred and fifty revolutions per minute, the frequency of the alternations will be one hundred per second. Such frequency, however, may be increased or diminished, according to the requirements of the particular conditions. Instead of employing separate sources of current energy at each of the stations, a single source may be utilized, and the desired potential values obtained by means of transformers,

rotary converters, motor-generator sets, and the like.

lVhereas, I have illustrated this invention by reference to one particular embodiment of the same, it will be understood that various changes and modifications may be made without departing frommy invention.

Having thus described my invention, I declare that what I claim as new and desire to secure by Letters Patent, is

1. In a printing telegraph system, the combination with a line, of a source of alternating current, means for maintaining uninterrupted electrical connection between said source and the line, a transmitting device including electromagnetic means for varying the potential on the line upon the operation of said transmitting device, and a receiving device responsive to said variation in potential.

2. In a printing telegraph system, the combination with a line, of a source of alternating current, means for maintaining uninterrupted electrical connection between said source and the line, a transmitting device including electromagnetic means for increasing the potential on the line upon the operation of said transmitting device, and a receiving device responsive to said increase in potential.

3. In a printing telegraph system, the combination with a line, of a source of alternating current, means for maintaining uninterrupted electrical connection between said source and the line, a transmitting device the operation of which is varied dependent upon the letter or character to be transmitted,

electromagnetic means responsive to said transmitting device whereby the alternating potential on the line is increased, and a receiving device responsive to the increase of potential on the line for reproducing the letter or character transmitted.

4. In a printing telegraph system, the combination with a line, of a source of alternating potential, a transformer whose primary is connected to said source, a transmitting device including a movable element, the operation of said element being dependent upon the letter or other character to be device including a rotatableelement, the operation of said element being dependent upon the letter or other character to be transmitted, electromagnetic means for r0- tating said element, said electromagnetic means being in connection with the secondary of said transformer and the line, said electromagnetic means further being provided with means excited upon the operation of said transmitting device for interrupting the movement of said shaft, and means for varying the connections of the line with said secondary for increasing the potential of the line.

6. In a printing telegraph system, the combination with a line, of a source of alternating potential, a transformer whose primary is connected to said source, a transmitting device including a rotatable element, the operation of said element being dependent upon the letter or other character to be transmitted, electromagnetic means for rotating said element, said electromagnetic means being in connection with the second ary of said transformer and the line, said electromagnetic means further being provided with means excited upon the operation of said transmitting device for increasing the potential of the line, and a receiving device responsive to the increase on the line for reproducing the letter or character transmitted.

7. In a printing telegraph system,the combination with a line, of a source of alternating current, means including a potential varying device for maintaining uninterrupted electrical connection between said source and the line, a transmitting device including a plurality of keys, said transmitting device including further a movable element and means whereby said movable element is given a predetermined movement dependent upon the particular key actuated, an electromagnetic device for rotating said movable element, electrical means connected to said potential varying device for increasing the potential on the line, and a receiving device responsive to the increase of potential on the line for receiving the message transmitted. Y

8. In a printing telegraph system, the com bination with a line, a source of alternating current, a transmitting device having a phirality of keys corresponding to the characters of the message to be transmitted, said transmitting device further lncluding a ro-,

t-atable element, means whereby said rotatable element is interrupted inits rotation at certain predetermined positions dependent upon the key manipulated, a transformer whose primary is connected to said source, the secondary of said transformer being provided with three terminals for yielding two dii rent p e ti ls, ele romag i means excited upon manipulation of said keys for varying the connections of the line with the terminals of said secondary, whereby the potential on the line is varied.

9. The method of electrical signaling, which comprises rotating similar elements at the transmitting and receiving stations simultaneously and in a predetermined man ner by means of a current of alternating-potential, interrupting the rotatable element at the transmitting station at a position dependent upon the latter or character to be transmitted and varying the potential of the alternating current passing over the line, and causing the rotatable element at the receiving station to be interrupted in a position corresponding to said position of the transmitting rotatable element for producing the message in printed form.

10. The method of electrical signaling, which comprises passing an alternating current of a certain potential over the line for causing two similar devices to be rotated in a predetermined manner, interrupting the rotation of the rotatable device at the transmitting station at a position dependent upon the letter or character to be transmitted and simultaneously increasing the potential of the alternating current passing over the line, and causing the rotatable device at the receiving station to be interrupted in its movement of rotation at a position corresponding to the position of interruption of the transmitting rotatable device for pro? ducing the letter or character transmitted in a printed form.

11. In a printing telegraph system, the

combination with a line, of a source of alterr strument having aplurality of keys correspon i g wee ett s or t c r t of the message desired to be transmitted,a

rotatable element, electromagnetic means for rotating said element, electrical connections between the line, said electromagnetic m ans an t o t m n s of s d e n a y,

' me ns .c iip r ng th sa keys he y S i ot able el nt is n r pt at a a n P sit n p nden up n he k y nipulated, and an electromagnet excited pon anipu ation f sa d ey for a ing t on e ti ns f h lin h h rrin s o sa s cond ry 12. In a printing telegraph system, the combination with aline, of a source of alternating current of a given frequency and p tent a a potential hangi g-d i e 0 nectedto said source and adapted to yield two currents of different alternating potential but of the same frequency, a transmitting instrument having a bank ofkeys corresponding to the characters or designations desired to be transmitted, said transmitting instrument further comprising a movable type wheel, an electromagnet having coils connected to said potential changing device and to the line for moving said movable type wheel, means actuated by said keys for mechanically interrupting the movement of.

said type wheel, electrical means put in operation upon operation of said mechanical interrupting means, said electrical means including a plurality of coils disposed about the core of said electromagnet, said latter named coils serving to electrically interrupt the movement of said movable type wheel, and an electromagnet excited upon the excitation of said electrical means for changing the connections of the line with said potential changing-device, whereby the line is continuously excited with alternating potential, which potential is varied upon manipulation of the keys of the transmitting instrument.

18. In a printing telegraph system, the combination with a line, of a source of alternating current of a given frequency and potential, a potential changing-device connected to said source and adapted to yield two currents of different alternating potential but of the same frequency, a transmitting instrument having a bank of keys corresponding to the characters or designations desired to be transmitted, said transmitting instrument further comprising a movable type wheel, an electromagnet having coils connected to said potential changing-device andto the line for moving said rotating type wheel, means actuated by said keys for mechanically interrupting the movement of said type wheel, electrical means put in operation upon operation of said mechanical interrupting means, said electrical means including a plurality of coils disposed about the core of said electromagnet, said latter named coils serving to electrically interrupt the movement of said movable type wheel, and an electromagnet excited upon the ex citation of said electrical means for changing the connections of the line with said potential changing-device, whereby the line is continuously excited with alternating potential, which potential is varied upon manipulation of the keys of the transmitting instrument.

14:. In a printing telegraph system, a type wheel, means for moving said type wheel, said means comprising an electromagnet having a plurality of coils, two of said coils being connected in series with each other and arranged when excited by an alternating current of a given potential under certain conditions to cause said type wheel to be moved in one direction, two of the remain ing of said coils being connected in series with each other and arranged when excited by an alternating current of a given poten-- tial under the same conditions to cause said type wheel to be moved in a contrary direction.

15. In a printing telegraph system, a type wheel, means for moving said type wheel, said means comprising an electromagnet having a plurality of coils, two of said coils being connected in series with each other and arranged when excited by an alternating current of a given potential and frequency under certain conditions to cause said type wheel to be moved in one direction, two of the remaining of said coils being connected in series with each other and ar ranged when excited by an alternating current of the same frequency and of a definite potential for causing said type wheel to be moved in a contrary direction.

16. In a printing telegraph system, the combination with a source of alternating current, of a key, a transformer having a secondary having three terminals and adapted to yield two different potentials, means for normally connecting the lineacross two of said terminals, and means operable upon manipulation of said key for changing the connections of the line with one of said ter-v minals.

17. In a printing telegraph system, the combination with a source of alternating current, of a key, a transformer having a secondary having three terminals and adapt ed to yield two different potentials, means for normally connecting the line across two of said terminals, and means for changing the connections of the line with the terminals of said secondary, said means including an electromagnet energized by said source and excited upon manipulation of said key.

18. In a device of the character described, a plurality of keys, a movable type wheel, a platen cooperating with said type wheel, electrical means for moving said type wheel, electromagnetic means responsive to variations in magnetic flux for interrupting the movement of said type wheel, and electromagnetic means for causing relative movement between said type wheel and said platen.

19. In a device of the character described a source of electric current, a plurality. of keys, a movable type wheel, a platen, electrical means for moving said type wheel, electromagnetic means controlled by said keys for regulating said electrical moving means to interrupt the movement of said type wheel, electromagnetic means for shifting said type wheel in a direction toward said platen, and an alining disk fixed to said type wheel for rectifying the movement of said type wheel toward said platen.

20. In a device of the character described, a source of alternating current, a plurality of keys, a movable type wheel, a platen, electrical means for moving said type whee], means responsive to alternating current and controlling said moving means to interrupt the movement of said type .wheel, said in-w terrupting means including an arm fixed to the shaft of said type wheel and electromagnetic means for causing relative movement between said type wheel and said platen.

21. In a device of the character described, a source of electric current, a plurality of keys, a rotatable type wheel, a platen, electromagnetic means for rotating said type wheel, and means responsive to variations in current for controlling said rotating means to interrupt the rotation of said type wheel, said interrupting means including an arm fixed to the shaft of said type wheel and a plurality of pins cooperating with said keys and adapted to mechanically stop said arm.

22. In a device of the character described, a plurality of keys, a rotatable type wheel, electromagnetic means for rotating said type wheel, and electrical and mechanical means for interrupting the rotation of said type wheel.

23. In a device of the character described, a plurality of keys, a rotatable type wheel, electromagnetic means for rotating said typo wheel, mechanically and electrically controlled means for interrupting the rotation of said type wheel, said means being controlled by said keys, a platen, and electromagnetic means for causing relative movement between said type wheel and said platen.

24. In a device of the character described, a source of electric current, a plurality of keys, a rotatable type wheel, a shaft, said type Wheel being connected to said shaft by a universal joint, means for rotating said type wheel, means electrically controlled by said keys for interruptingthe rotation of said type wheel at desired positions, a platen, and means for shifting said type wheel when interrupted in said positions in a direction toward said platen.

25. In a device of the character described, a source of electric current, a plurality of keys, a rotatable type Wheel, a shaft, said type wheel being connected to said shaft by a universal joint, electrical means for rotating said type wheel, means electrically controlled by said keys for interrupting the rotation of said type wheel at desired positions, a platen, and means for shifting said type wheel when interrupted in said positions in a direction toward said platen, said shifting means including an element movably connected to said type wheel.

26. In a printing telegraph system, the combination with a line, of a source of current, means including a potential varying device for connecting said source with the line, a transmitting instrument having a movable element, electromagnetic means for moving said element, and means for interrupting the movement of said element at definite positions and for increasing the potential on the line, said last named means being actuated upon the operation of said transmitting instrument.

In testimony whereof I afliX my signature, in presence of two witnesses.

FRANK B. RAE. Witnesses:

HENRY J. LUCKE, Gno. N. KERR.

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

Images