US1119117A - Telegraph transmitting system. - Google Patents

Description

E. RAYMOND-BARKER.

TELEGRAPH TRANSMITTING SYSTEM.

APPLICATION FILED JULY 18, 1912.

1,1 1 9, 1 1 7, Patented Dec. 1, 1914.

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,6 ATTOR/VEVJ UNITED STATES PATENT OFFICE.

EDWLRD BAYMOND-BARKER, OF WIMBLEDON, ENGLAND, ASSIGNOB TO COMMERCIAL CABLE COMTANY, OF NEW YORK-N. Y., A CORPORATION OF NEW YORK.

TELEGBAPH TRANSMITTING BYSTEK.

Toiall whom it ma concern:

Be it known t at I, EDWARD RAYMoNn- BARKER, a subject of. the King of Great Britain, and a resident of 13 Lingfield road, Wimbledon, Surrey, En land, haveinvented certain new and usef 'Improvements 1n Tele raph' Transmittin Systems, of which the ollowing is a speci cation. This invention relates to improvements in electro-mechanical devices for sending electric currents into a submarine cable or other telegraph line under peculiarly advantageous conditions inregard to the electrical condition of theline; and it has for its main object to provide means whereby a constantly alternating series of positive and negative current impulses may be sent to the line, each impulse constituting a signal umt, as a dot or a dash, so that notwo following signal unit impulses will be of the same polarity.

A further object of the invention 1s to provide electro-mechanical devices by means of which Morse signals of short dots and long dashes controlled at the sendlng end of a cable or other telegraph line by an ordlnary Morse key or by the ordinary form of Wheatstone automatlc transmitter, ma be sent into a cable by means of regularly a ternating positive and negative currents do rived from a galvanic battery or other source of current, the said alternation always taking place whether the complete signals consist of a number of Morse dots in succession or a number of Morse dashes in succession or a combination of Morse dots and. dashes as met with in the various Morse codes. 7

A further object of the invention is to 1'0- vide means at the receiving end of the ins to receive said alternating series of signal impulses without regard to their polarity and to reproduce them as Morse si a1 units, the dots and dashes bein distinguished from each other by reason 0 their duration and irrespective of the im ulses. I

ther important objects and advantages of the invention will appear hereinafter.

In the drawings, Figure 1 is a diagrammatic view of one 'form of my invention showing both the transmitting and receivmg e o lar diagrammatic view showing a slightly diflferent form of transmitting apparatus.

polarity of the currentf a cable system; and Fig. 2 a simi 7 Patented Dec. 1, i914. 1912. Serial No. 710,1ao.

als, 1 designates a Morse hand key whichworks in and controls a local circuit containmg a battery 2. In this local circuit is a magnet 3 which is arranged to operate the I arm 4 of a ole-alternator. This pole-alternator may e of any suitable construction, but as shown in Fig. -1 it consists of the electric magnet 3; the pivoted arm 4 carrying the magnet armature 5. On the end of the arm 4 is stifliy tongue 6 which is pointed at itslower en and enlarged at its pivoted end. Below this ton ue is pivoteda rocking beam 7 This roc ing beamiis so shaped, and is so adjusted in its position relativeito the pointed tongue actuated by the pole-alternatorthat in any pivoted ,a dependin normal position of rest the point of the.

tongue cannot impinge upon the center of the rocki beam but only at points near the center ut on the one side or the other thereof. To accom lish this the rocking beam is provided with a central upwardly extending V-shaped tooth and with a corre' sponding tooth on each side of said center tooth, the pointed tongue eng ing first on one side of the center tooth an other side according to which side is upper most when the tongue is making its downward stroke. A sprin 8 engages the u' per surface; of the pivote tongue and 1101 s it normally in its vertical central position, as shown in Fig.1, said tongue in its said central position being arranged to engage on the right hand surface of the centraltooth on .the left hand side of the central tooth and' the said rocking beam and tongue will then be' thrown to the left. and so on throughout eachoperation of the pole-alternator. From this it follows that successive workin cause t e pointed tongue to. force the rockthen on the of the pole-alternator armature.

in beam alternately to the right and to, the lel t and the tongue is deflected away from its central position either to the rightor to the left. This vibratory or swinging movement of the tongue I make use of to alternately close two local circuits in each of which, actuated by a common local battery, is an :electro-magnetic transmitter. These two transmitters, in conjunction with a sending battery, act as an ordinary cable key capable of sendin either positive or negative currents to th line; n

Projecting at right angles from the face of the tongue 6 is an arm 9 which is adapted to engage one or theotherof two contact points 10 and 11 each ofwhich in an independent local circuit. The arm 9'is in circuit with the batteries of said local circuits so that said arm completes one'or' the ot er of said circuits upon each downward move ment of the armpf the p'ole alternator. In each local circuit is an electro-magnet12 each of said magnetsforming a part of'a transmitting"device 13 and 14, A pivoted arm 13 ofthe transmitting device. 13 operates between two contact points 15 and 16 while a corresponding arm 17'of the transmitter 14 operates between two'contacts'18 and 19. It isftherefore,{manifest that the contact arm 9will first close the local circuit A through the transmitter 13 and 'uponfits next operation will'close the 'circuit through the transmitter 14. The transmitter 13 is arranged toplace negative current tothe line or cable and the transmitter 14is arranged to' place positive current to the line or cable. To accomplish thisthe back con tacts 1 5 and 18 of the two transmitters are connected to"'the positivepole of the battery or other source of electric current and the front contacts 16 and 19are connected to the negative oleof the battery'or other source of electric; supply. The armature'of the transmitter 13 is electrically connected to the cable or telegraph line C by wire a, while the armature of the transmitter 14 is connected to earth at E. It is manifest from tliis arrangement that when the arm of transmitter 13 is actuated and thrown against its front stop "16 a ne tive impulse will be sent to the line, an when the corresponding arm 0f "tl1 transmitter 14 is actuated and its pole-changing arm sent'against its front contact 1911 positive impulse willbe sent to the line. It is clear that the alternations of current impulses to the line take placeautomatically on the operation of the transmittin key or other transmitting appara tus an that said transmitting apparatus or device is operated in the ordinary manner for transmitting Morse character's. Successive workingsof the pole-alternator armature cause alternate positivc and negative cu'rrents'to' pass to the line irrespective of the length crtime vaitie *ofeach current iinpiilse.

At the receiving end of the. cable. any suitable form of receiving device may be employed, such, for instance, as a relay 2O havmg a swinging tongue 21 adapted to be moved in response to the incoming currents.

"This relay is;-provided with two stops 22 both of which are connected to one side of any suitable form of non-polarized relay or Morse receiving instrument 23, the contact 01': the rela 20 being connected to said instrument t rough a local battery. It is manifest that thesignal impulses will be re produced in the receiving instrument as short or long impulses irrespective of the polarity of the impulses,said signal impulses being distinguished from each other by the time or length of duration.

In the form of apparatus shown in Fig. 2 a hand Morse key 245 is arranged in a local circuit which includes an electro-magnet 25 of an clectro-mechanical'cable key or transm'itting device 26. This vkey is provided with a pivoted arm 27 which carries the armature for the electromagnet 25. One end ofthis arm carriesa contactpoint 28 which 7 vibrates between a backstop 29 and a front stop 30. The swinging arm of the transmittin device is e ectricallv connected to the ca le or telegraph line C, and the back stop o'f'said transmitting device is connected to earth." Oneend of the arm 27 isadapted to engage the teeth of a ratchet wheel 31, said arm and said wheel being so arranged that upon each operation of the arm the wheel" WilIbe-rotated one tooth'so that said wheel hasan' intermittentstepfby-step ronioveme nt under the'influen ce of the transmitting" device operated through the Morse transmitting key. On the shaft 31 of the ratchet wheel are secured two'disks 32 and 33of'a'n suitable non-conducting material. ach isk carries a contact point for each tooth of theratchet wheel. As shown in the drawing the ratchet wheel has eight teeth and the contact or circuit closin disks each' have eight contact points 34. T ese contact oints' are electrically connected to a sen ing battery 35; each alterna'te point being connected to the positive pole of the battery, the other points being connected to the negative poleof' the battery; and thesaid contact points are so arranged on each disk that a negative'cdntact point of one ,disk will be adjacent to andin line witha' bsitive contact ,point on the adjacent disk. Adapted'to engage these contact points are two contact brushes 36 and 371 the brush 36 engagin the points of circuit closing disk 32 and ihe brush 37 engaging the contact points of disk 33. This-latter brush are electrically connected to earth while brush'36'is connected to the front stop of the transmittin key.

It is manifest irom' the arrangement of the parts shown'in Fig. 2 that upon the depression of the Morse transmittin key the ratchet wheel and the circuit closing disks will be given a rotary movement suflicient to shift the contact under the brushes and thus change the polarity of the current to the line, the contact point of the transmitting key at the same time engaging its front contact that the brush of circuit closer disk 32 will be directly connected electrically to the cable.- Therefore, as the brush of said disk will alternately engage positive and negative contact points, the polarity of the current of the line is changed at each operation of the Morse key. The circuit 0 oser disk 33 correspondingly puts positive or negative current to earth.

,The' receiving apparatus for the form of transmitter shown in Figf2 is precisely the same as that used in connection with the apparatus shown inFig. 1.

From the foregoing it 18 clear that I p1ovide'very simple electro-mechanical means for transmittin signals made up of dots signals being transmitted by means of'alternating impulses of current of opposite polarity.

Many modifications of the mechanical means for securing the reversals ni current may be employed and I do not wish to..be limited in this respect; and the system may be duplexed in the ordinary'manner, if desired.

I am aware that the broad principle ofa telegraph system wherein the signals or units of signals are'transmittedby'a series of electric impulses in which each impulse iso posite in polarity to the preceding one,

so at no two following or successive signal impulses are of the same polarity, is the in vention of John Gott of Brighton, England, for which invention he has made application for patent, and I do not wish to claim said princi le or telegraph sy'stem, broadly.v

What-I 0 claim as my invention and desire to secure by Letters Patent, is:

1'. A system of electricsignaling conipfising a transmitting key, a. line, means for throwing upon'the line impulses of current each impulse. constituting a signal unit, said means earthing the 'line after each current impulse, and mechanically operated means-- controlled by the'closure of the key for reversing the polarity of the current to the line for each signal. unit-impulse.

2. A system of electric signaling com rising a signal transmitting means, a1 e, means for throwing u on the line impulses of current, each impn as constituting a signalwunit, said means earthing the line after each current impulse, and mechanically operated means controlled by the closure ofthe transmitting means for reversing the polarity of the current to the line for each signal unit impulse.

3. A system of electric signaling com rising a signal transmitting apparatus, a 'ne, means for throwing upon the line impulses of current, each impulse constituting a signal unit, said means earthing the line after each current impulse, and mechanically operated means controlled by the :closure of the signal transmittin apparatus for reversing the polarity 0% the current to the line for each signal unit impulse, whereby no two following signal unit impulses will be of the same polarity.

.4. A system of electric signaling com rising a signal transmitting ap aratus, a ine, means or throwing upon t e line an impulse of current for each closure of the signal transmitting apparatus, each impulse constitutin a signal unit, a circuit reverser controlled y the closure of the transmitting apparatus to change the polarity of the line current for'each succeeding impulse of ,current and means for earthing the line after each current impulse.

5. A telegraph system comprising a line,

5 means for throwing positive or negative current to the line, a transmitting device, an electro-mechanical means for controlling the polarity of the current to the line, said means reversing the polarity to the line at each successive operation, means at the receiving end of the line responsive to im pulses of current of opposite polarity, and means to reproduce said impulses irrespective of their polarity, whereby-*said reproduced impulses can be distinguished from each other only by their duration or length, and irrespective of fl1eir polarity.

6. A system of electric signaling comprising a transmitting means a line, means for throwing upon the line impulses of current eachimpulse constituting a complete signal unit, said means, earthing the line after each current impulse, mechanically operated meanscontrolled by the transmitting means for reversing the polarity of the current to the line for each signal unit, means at the receiving end of the line responsive to impulses of currentof opposite polaritv and means to reproduce said impulses as signals irrespective of their polarity, whereby said reproduced signal impulses can be distinguished from each other only bv their duration or length and irrespective of their polarity.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

EDWARD RAYMOND-BARKER. Witnesses:

Cmumns Core,

H. D. J s n-son.

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