US2136672A - Electrical transmitting mechanism and circuit - Google Patents

Description

Nov. 15,1938. cTL. CALKINS T 2,136,672

ELECTRICAL TRANSMITTING MECHANISM AND CIRCUIT Filed larch 16, 1934 5 Sheets-6mm l /7 T T V T I fhyeiefok 6%azzzrceyl6d/4M;

Nov, 15, 1938. I c. L. CAVLKINIS 2,135,672

ELECTRICAL TRKNSMITTING MECHANISM AND CIRCUIT Filedlarch 16, 1934 5 Sheets-Sheet 2 Inventor zawzcg yjfa/iz'lzg Nov. 15,1938. c1 CALKIINS ELECTRICAL TRANSMITTING MECHANISM AND CIRCUIT 3 Sheets-sheaf 5 Filed March 16, 1934 QB w E and N kw IX m.\\ H: m H

" Patented Nov. 15, 1935 PATENT OFFICE} 2,136,672 ELECTRICAL TRANSMiTTlNG "MECHANISM Chaunce CIRCUIT L. Calkins, Chicago, m, assignorto Lothar A. Ederer, Chicago, 111..

Application March 16, 1934, Serial no. 115,908

6 Claims. (cunt-s53) My invention relates to improvementsin electrical message transmitting systems and particularly toautomatic transmission of short messages and of morethan one message simultaneouslyin a simple manner and by unskilled operatorsj Q j One object of my invention is to provide an electrical message transmitting system capable of sending a plurality of simple messages simull taneously. Another objector my invention is to provideyan electric transmission system which will transmit amessage comprised of a small number of code symbols or numbers quickly and accurately and in such a'fmanner that the transl missionj of. all characters and numbers takes place simultaneously. Other objects of my invention will appear from time to time in the specification and claims. 1 n

For the purpose of illustrating the system 20whichI have invented, I have shown a complete wiring diagram and schematic drawing of such a system showing wiring and apparatus in diagrammatic mannerfcapable of settingup two 1 distinct groups, each capable of usingany digit ti ons. It will be seen from my description that the apparatus may befarranged in a'variety oi. ways and that changes may be made in'the electric circuit which will accomplish the same result 339 as theparticularfshowing in the drawings,and

. it is to be understoodthat my showingis thereforeto be considered in a sense diagrammatic and that there are a variety of possible. equivalent forms which do not depart from thespirit *of theinvention.

Figure 1 shows a wiring diagram andjsche- 3 matic layout of the messageset-up apparatus;

"Figure 2 shows a wiring diagram and schematic layout of the automatic electric message 1 transmitter and its operating mechanism, to-

gethenwith the receiving apparatus for such messagesf 1 *Figure 3is a side view of the mechanism of the multiple impulse generator; and

4 Figure 4 is a viewpartly in section oi the impulse generator drive and the special transfer switch mechanism. s

The apparatus of Figure 1, the wiringof whichterminats ina singleterminal strip, is

connected by "a cableto the apparatus of Figure 2, which also terminates in a single terminal strip. Although these drawings show but a single transmitter and receiver, it is obvious that a pll1 frality of such systems may be used whichmay "55 be Operated i rn by the same electrical rnesindicate like parts throughout the specification .3 from one to ten, inclusive, many of three .posiing e sage sender. My showingis therefore not limited .to a single unit of such apparatus.

For convenience and clarity. of description, the following system of designation hasbeen adopted). Capital letters designate sub-assemblies in 5 each main unit, small letters of like character designatethe parts of" each sub-assembly, and numerals designate the' wiring. Like characters and drawings. a Referringnow to Figure 1, A is a. battery or other source of electrical power capable of operating theentirecircuit. B, C, and D are. a group of three message set upswitches comprising one bank. 1 E, F, andG are another group of three 15 message set-up switches comprising a second bank. H and I are control relays operating the banks B, C, D and E, F, G, respectively, Hand 1 are" signal relays connected with eachbank. of switches. Relay I. comprises three pairs of 20 switch leaves i; i and 1 Relay H, operates three pairs of switch leaves It, hhand hfi The relay H has a single pair of switch leaves h? and relay I .has also a single pair of switch leavesi h is the winding of relayHand hi the winding of the relay H 1 is the winding of the relay I and i is thewinding'of the relayI b, c, and d are signal lamps associated with their respective switches; e, f, and g are also lamps associated with their respective switches. Switch B comprisesa wiper arm b and the series ofcontact points b b b 1), .etc., .to b", which are connectedand'in parallel with the switch points e e e etc., to and including e Switch E is also provided with a switch arm e In series with the switchpoints b and 6 is a resistance e". In

series with the switch points b and e is a resistance 8 In like manner the other. pairs of switch points are provided with a resistance in series numbered consecutively up to and includ-' 40 The switches C and F, and also D and G, are connected together andare numbered and lettered in a manner exactly similar to the switches B and E. The connections are not here described since they duplicate'exactly the connections already described for B and E.

[Electric lead or wire l is a main negative lead. Wire 2 is a main positive lead. These leadstermihate. in suitable terminal pieces .on a common terminal strip. Leadingfrom the positive wire 2 to the switch leaf {3 is the; wire 3, and also leading from .wire 2 to switch leaf h is the wire 4. Leading to one sideof the windings i and i and also to one side of the switch pairs i, i 1' is the negative wire 6. Similarly leading from negative wire l to the windings n. M and to one side of the strip. Wire 44 leads from the mside of ,the

1 tor driving three electric impulse generators K, L

switch leaves h, h it is the wire I. The wire 8 leads from one side or the switch leaf )1. to one side oi the signal lamps b, c, and d. The wire I leadsto the other side of these lamps and also from one side of the lamps e, I. and a to a block on the terminal strip. Leading to the other side oi this secondgroup of lamps is the wire I! which is connected to one side of the switch pair 1 The wireflgi leads from the switch arm b to the switch pair h. The wire i2 leads from the switch arm c to the switch 'pair 71 Wire ll leads from the switch arm ti to the switch pair h. Wire l4 leads from the switch arm e to the. switch pair 1'. Wire ll leads iromthevswitch arm I to the switch pair 1*. Wire l4 leads from switch arm 9 to the switch pair 1. Wire I1 is common to the switch points b and e and leads to a block on the terminal strip. Wire II is common to the switch points b. e and likewise leads to a block on the terminal strip but has included in series the resistance 8", as described. Similarly, wires I! to connect pairs of switch points and a resistance in series with appropriate terminal blocks in this group B, E 01' switches. Wire 28 connects switch pointsc' and F01 switch group C, F and wire 21 connects point e and point i with resistance I in series. In like manner wires 2. to 34 connect other pairs oi points in this switch group and these wires are lead to terminal blocks. Wire 35 connects point 11 and point o oi switch group D, G and similarly wire 84 connects points d and a with the resistances a" in series. In like manner wires 31 to 42 connect other pairs 01' points in this switch group and thesewires are brought to appropriate blocks upon the terminal windings i i'to a block upon the terminal strip. Wire 45 leads from the far side oi the windings h, h to another block'upon the terminalstrip. Referring now to Figure 2, J is an electric moand M, the motor shaft 1 being common to the aforementioned impulse generators. The motor J is compound wound having the series field 1'', i

and the shunt field j', i. Mounted upon the shaft 1 is a special switch operating cam 1 journaled upon the shaft 3i and driven by' the gear 7' at half motor speed. This special switch operating cam has the cam striker 1" which acts against three sets of switch leaves 1'', I and a. 1 is a condenser resistance used as a spark suppressor.

. The impulse generatorK comprises wiper arm k and a series of wiper switch points W, k, k etc. These wires are connected respectively to switch leaves k", k"; k", etc. The impulse gen erator L comprises the wiper arm I and contacts I 1', P etc., to and including 1'. These wires are connected, respectively, to switch leaves 1 l", 1

etc., to and including 1".

- The impulse generator M comprises the wiper m, wiper switch points m m m etc., connected to the switch leaves m", m", m", etc., k", I" and switch point groups E, F, G and B, C, D, respectively. P is a multiple relay having the switch pairs p. 9. p and p thecoilv winding 9 Q is a multiple relay having the switch pairs q, q q, and q and the coil winding qt. R is a jack switch having contacts 1', r 1' and insulated from r the switch pair 1'. S is a jack switch having the contacts 8, s .1 and insulated from s the switch pair .s These Jacks may be actuated by means oi the loose plug T having the metallic conductive note t. D is an operating relay having the switch pairs u. u and the coil winding u.

The annunciator unit N contains three step-up .mechanisms designated as n, n and n which may be oi any conventional form and may carry drums or dials upon which the characters are displayed. The step-up mechanisms are actuated by the solenoidsn n and 11 There are switch pairs n, n and n' which are also actuated by the step-up mechanism. These step-up systems have a release or clearing mechanism comprising the solenoid or reset magnet n", its trip mechanism for the step-up ratchets n and also a switch pair n".

The terminal bar of Figure 2 corresponds exactly to the terminal bar of Figure 1 and is similarly numbered as to the wiring. The motor J receives current through its series field and armature from the positive lead 2 through the wire 48 and returns current from this field through the wire 9. The wire 41 leads from the negative lead I to one side of the switch 0 which in turn connects with the compound field through the wire 41 and 9. The positive wire 46 also supplies current to the winding a of the relay U and to one side of the switch pair u Positive wire 2 further extends and makes positive connection through the wire 48 through the winding q and from thence ,to one side of the switch pair a. The wire 49 leads from the positive wire 2 to the winding 17 and thence to one side of the switch pair 1'. Wire 50 leads from the positive wire 2 to the winding 11 and from thence to one leaf of theswitch q. Wire 2 finally leads to the winding of the reset magnet o and from thence the wire 14 leads to a leaf of the switch 0 and a leaf of the switch p. Wire 5i leads from 2 to the intermediate point of the double winding 0, v of the relay V. From the negative lead I, wire 52 is common to one side of the three switch pairs 11.. n and n. In like manner wire 53 is common to one side of the switch pairs o, o" and 0'. Wire 54 .is common to one side of the three solenoids M, n and n and from these solenoids the wires 55, 55 and 51 lead to the switch pairs :1 q and q Further, the wire I extends as a common wire to the solenoids 0 0* and 0. From these solenoids the wires 58, 59 and 60 lead to the switch pairs I P and p Wire 6i leads from the switch 0 and is common to the three switch pairs 0, o and 0". Wire 62 leads to one side of therswitch n and is common to the three switches n,'n" and a. Wire 63 leads from winding v of the relay V to one side of the switch pair i.- Wire 64 leads from the the winding v" of the same relay to the contact 5? of the jack S and the contact 1' of the jack R. Wire 65 is common to the other side of both switches i and 9' and also to the switch 9" from which it leads to the contact s oi the jack S and r of the jack R. Wire 66 leads from switch pair i to one side of the switch q and is extended to one side of the switch 1:. Across wires 65 and 66 is the spark suppressor 7 Wire 61 leads from one side of the switch ii to one side of the switch it and also to the relay coil u. Wire 44 leads to one side of the switch s and is therefore the actuated lead between switch bank E, F, G of Figure 1 and jack S of Figure 2. Wire 45 leads to one side of the switch r and is therefore the actuating lead between the switch bank 3, C, D

of Figure 1 and the jack R of Figure2. Wire" leads from one side of the switch-u to a. lead common to; the relay series 70 it, 'etc., also to the switch arm is of the wiper switch K, and in like manner reeds one side of the relay 'group Z, 1 etc.,-andnthe switch arm l -of the wiper switch L and finally the-relay. group m, m, etc.,

and'thearm m.-of the wiper switch M. The

other. sidesof these relay groupsynamely, m

nectedtothe wires i1,;.l8 etc, for the first group ..and126,21 etc., for the second, and 35, 36,etc..

1 wfor the third. 'I'helead 69 connects one side of the seriesof switch pairs m ,tm etcr, withone leaf of the switch pair p and with one leaf of thepair q uThe spark suppressor m is connected across leads 68 and 69. The lead 10 is common to. one side of the series of switch pairs 1 Z etc and leads to one side of the switch pair 9 Wire 10 also leads to one side or the switch pair q The spark suppressor Z is connected between'wires 68 and 10. The'wire 1| nectsthe contactr and the contacts with one side oi the switch pair u. r I

Referring'to Fig. 3,which-is a side view of the mechanism of. the multiple impulse generator, J

is the electric motor driving the rotary switches KL and M, comprising the impulse generator. The apparatus is-mounted on a base plate 7' having the supports 7' 1', :i ,d and 9, carryingthe shaft 1'. The friction wheel 1' is attached to the shaft 1 and isdriven by the friction wheel 9' directlyfastened to the motor. These -friction wheels providethe desired speed reduction. Three specialswitches, 1 9' and 9' appear in the drawing, and they are acted uponby the camii carried onthe wheel? ofthe two to one reduction gearing. Therotary switches or =impulse generators KQL and M include the contact buttons five of which, k to k and l tol and m to m are shown in each case, acting upon the three contactsonthe wiper arm is, land m carried on the shaft 7'. r

Referring to Fig. 4, which is the reduction gearing and special switch mechanism, J is the electricmotor,cmounted on the base plate 7'".

One of the supports 9' which carries the main shafta'also isshown in thisdrawing. The

drive wheels 'are'a and 7' The two to one reductiori gear operating the special switches appearsiri the gear wheels 9' and i The switches One suitable form of the mechanical con structiori of the reset mechanism on the devices here indicated diagrammatically is shown in United States.Patent1,976,248, issued to Arch D.

Rollins, October 9, 1934; h The use and operation of my invention are as follows: 1

stock or produce exchange to a recording board.

I will now describe the use of the particular apparatus shown in this or similar service. It will duplexgroup ofreceiving annunciators, together with the automatic transmitter for such stock and a group of annunciators;

transmission apparatus, however,is common to dicator.

. exchange use, thetransmitter and receiver units,

namely,jthe switch banks 13, C, D. and 5.1, G,

together with [their related receiving annunci-' waters 0 and N, will be duplicated ior each stock listed. The operator of the device selects a stock and alsothe information either Bid or Ask by the insertionof the loose plug T in a seriesof pairs of jacks, including R, S, one of said jacks being the Bid information for a specificstock andthe other the ask information for the same stock. Another stock will have allotted to it another pair of jacksand will be served by another group ofmessage set-up sending switches The automatic any number of such combinations.

Assume then that the. apparatus is in use in a stock exchange and that the apparatus shown in Figure l is either upon the floor orin immediate touch therewith, as by'direct telephone. Another operator. manipulatesthe two switch banks continuously according to the information received. "In otherwords, for every change inprice bid, or price asked; the operator will set up the three switches B, C, D to represent'the 2 figure bid, and the three switches E, F, G according to an ask quotation. The. mechanism which-registers and displays to the operator the position of the switch has not beenshown herein asit forms no essential part of the invention. Any suitable dial or pointer system may be used, registering the digits l to lo inclusive. As this setting up of the figures is presumed to be a more or less continuous process, the "changes being made immediately upon receipt of information, there. is supposed to bealways a message ready to be sent at the sending switches. If there has B, C; D have been set to any arbitraryiposition,

the switch arm c being upon contact c and the switch arm :1 being upon contact :1 The operator at the central station desires this information whichis upon the bid" group of sending switches. She plugs into either jackand assuming the message unchanged for the ask quotation and the plug is inserted in the ask jack, gets no changed. quotation or figure at that in- But upon inserting the plug T in the jackR,there being a change in the position of the sending switches; the following action takes place: Connection is made throughthe metallic tip toilthe plug T from the main negative lead 1 1 which is connected to a contact in each jack to the leaf 1 which; in turn, by meansof thewire saleads to the winding 1: of the differential woundrelay V, the other side of thiswinding I being connected" to: the main positive po-werlead 2. .I'hisenergizes thisrelay closing the switch point 11 which makes negative connection from I i the wire l through thewires to the com- My message transmitting apparatus may have a wide'variety of uses. A particular use is the transmission of quotationsfrom the floor of a pound winding of themotorJ.

From this winding connection is made through wire 4'6 tothe main positive power lead2. This step then energizes and starts the motor. The switch leaves 1' are closed as the resultof the insertion of the plugT, although insulated from the metallic part of the plug. This closureplaces wire 45 in contact with the winding 12 of relay P through the wire 49,the other sideof this relay being connectedto the main positive power lead been no change in quotationandthe operator of the main boarducauses a message .to be transmitted, the efiect upon theqannunciators will obviously be to repeat the previous quotation or figure. Assume then that the switches in bank to the main negative lead I.

2. Wire 45 shownin both Figure 2 and Figure 1, leads also through the terminal strip to the winding 71 in the relay H (Fig.1) the other side oi thisrelay being connected to the negative side of; the battery. The contact established through wire I also places the winding h or the relay H into contact withthe main power lead 2, through the wire 49 and the .wmdins e or the relay P. The-other side of the relay H ,is connected to the negative side of the battery by means. of the wire; 1. Hence this step energizes relays P and H and K, said relays controlling sending switch bank B, C, D and its appropriate receiving annunclator 0, as well as the, signal lamp group b, c, :1. Closure of the pairs of switch leaves 11, 9 p and p The closure or switch p brings wire 66, which is connected to oneswitch pointof that switch and is actuated by the impulse generator, into connection with the wire '14 which, in turn, leads to the magnet o and eventually. to main constant power lead]. The closure or the leaves 9 p and zfi brings one side of the relay switches associated with the impulse generator units L, K, and M'into contact with the annunciatormagnets 0?, o and o, the other side of saidmagnets being connected The energizing of relay H makes negative connection through the ,wire I commonto one side of each of the three switch pairs h, M, and h thence through the wires l3, l2, and .Il tothe arms d c and b of their respective switches. As presupposed, the .switch arm b is upon contact b the arm 0 upon contact 0 the arm (1 upon contact d these positions representing three different characters or numbers which are to be-transmitted. Switch B 'set asdescribed, connection is made through arm bHcontactb andwire I I to one side of the magnet m" of the relay group in the impulse generating unit M. It will be seen that this closure of this step will permit current to pass through the entire series of magnets m'-, m l, m" etc., which will close'their respective switch points 111., m", m etc., which in turn will cause. 9 impulses to .be generated for every revolution of the wiper arm m. In a similar manner in the case of switch C, negative connection ispmade through the arm .0 the contact c and the wire 21 to the magnetl of impulse generat ing unit L. In this case it will be seen that current can pass through only eight of these relay magnets, the magnet 1 not being energized. Hence impulse generator L will transmit but eight impulses per revolution and. will therefore select a character diiferent from that selected by generator M. In the case of switch B and the impulse generator K with the switch arm d upon contact d, the setup will generate nine impulses as in the first case. If the number of impulses corresponds to a digit to be transmitted, the figure transmitted for this setup would be 989.

It will be noted that in the case of theswitch C a resistance i is foundinthe series with the wire 21. This resistance ,is to compensate for the resistance of the magnet 1 which is omitted in this particular setup. There are a series of such resistances, each of appropriate value, in

the series in all the circuits except the first one in each switch group. These resistances are so proportioned as to balance the resistances of the magnets in the relays which are omitted by the setting of the switch so that the net result will be always to. have a constant resistance in the circuit regardless of how many relays are energized.

Figure 2, namely, part way between the switch leaves 7'" and i as will be described later. Hence, when the motor starts again, its first operation is .to'close the switch leaves 9 which makes negative connection from the negative power lead I through wire 65 through the leaves 1' to the wire 66, and thence to the switch leaves 12 of the relay P and thence through the wire 14 tothe reset magnet 0 in a manner in part already described. This energizes the reset magnet and trips or releases the indicator units of the group 0, allowing these dials or drums to return to the zero position. The action of the magnet 0 in addition to tripping mechanically the indicator dials, closes the ,relay switch o which is common to one side of the three switch pairs 0 0' and 0 Since the other sides'ofthese switch pairs are connected to the main negative lead, it will be seen that as long as any of these switch pairs are closed, in other words, as long as any indicator is of! normal or zero position, the magnet o willbe connected on one side to negative wire I and on the other side to positive wire 2, and will remain energized as long as any of the indicator units are off normal. When these units are returned to normal or zero position they automatically open their respective switch leaves which, when all three are so opened, breaks the circuit through 0 This clearing step having been performed by the motor, the cam 7' continues to revolve until it contacts the spring pair 9" which then makes contact from the negative lead I through the'wlre 65 to the wire 61 and the coil 1L3 of the relay U. The other side of this relay is connected to main positive lead 2 and is therefore energized. The energizingof the relay U closes the switch leaves u, u The closure of the switch leaves u locks the relay in position since it makes negative connection through the wire 12 to the leaf r of the jack R, which has previously been connected to the negative side of the system by the plug T. The closure of the switch leaves 17 makes positive connection from main positive lead 2 through wire 4'6 to wire 68. Wire 68 is common to one end of each series of relay magnets; The negative connection to each has already been described as established through the setup switch arms 27 C d and contacting selected contact buttons upon each switch. The wire 68 further supplies a positive connection for each of the rotating wiper arms m, Z, and k of the three impulse generating units M, L, and K. Hence, subsequent to the closure of 9' and the relay U, further turning of the motor J driving the arms m, l, and 70, will cause electric impulses to be generated by closures effected in this rotation between the arms and their respeccami -is driven at"half moteryspeed and ewt j ms eerseeswe e edto i ng oi the" contact "buttons ay the arms er the oppositekdirection to tpewmding and -"henee neutralizes the actionfof this windingcausing{the 'relay v to-openy which in turn sto'ps we motor. I

{impulse generators; the cam iSStrikeS the leaves 1 This closure makes neg'ative connection from main negative; lead l through wire '65 to wiref63 willi 'beseen'th'at tliis winding isarranged in he relay v V beconies again" i momentarily jenergized, causing the motbr to" start for an; instant moving the camfi- Off the 'lavs i 'tb thpositidli". betwe n transmission ofthe next message. The momen jtarywenereizing time rela v is the result of the circuit in winding v being broken by'the removal of the plug T. This leaves thewinding '0 active since on 'one side it is connected to positive power lead! through wire 5| and on the other side through wire 63, the switchleaves 7", whichare depressed by the cam 7' and the wire 55 to negative lead I. The energizing of v closes the switch leaves 1: starting the motor. However, i

as soon asthe motor starts it moves the cam 7' off the switch 7' opening the negative side of the nunciator bank Nis energized instead of the reconnection through winding 1: de-energizing the relay causing switch 12 to open and motor J to stop. This then leaves the cam j between the switches 7' and 7' which is the starting position, as already described, for the transmission of another message. The functioning of the setup switch bank E, F, G is identical in every respect with the operation justdescribed for the switch bank B, C, D, with the one exception that the operation is responsive to an insertion of the plug T into the jack S insteadof the jack R, and the compound relay Q associated with the anlay P associated with the annunciators 0. These two set-up switchbanks and the two annuncia-tor groups are'for the Bid andAsk quotations of the stock. n l

I claim: 1. In a-message transmitting system, a plurality of character selectors, an electric impulse generator for each character selector adapted to gencrate a selective predetermined number of impulses, normally open electric circuits connecting the character selectors and the impulse generators respectively, and eifective when energized to condition the impulse generators to transmit the selected characters by a number of electric impulses dependent uponthe, setting of the character selector, a character indicator for each character selector, each characterindicator having means for causing it to indicate a different char,-

acter responsive to the 'diflerent numbers of impulses transmitted by its corresponding impulse generator normally open circuit connections between the respective impulse generators and character indicators,an electric motor, for operating all the impulse generators in unison, means for tlve groups 01' buttons and finally from these buttons throughthe switch leaves=?asscciated with each i button actuated by the "ciosurebra l certain unumber f relairsirreach grouparidfin the mafil ner v already-described? has been stated,-;tlie

' generator foiffeach icharacteryselector adaptedj ito generate-"a selectivejpredeter ined number jotfimthe characterseleetors aiidthe; bfile t i madame-impul e enaentupcnthe settin'ggj lector; a character ihdicator rot riar j sele'ctjor, 'eacncharacter indicate havin transmitted p t'se rresp a nected to the wiper arm, the other side of said circuit including a plurality of branches, each energizing themotor and closing the circuit conf nectionsbetweenthe l mpiise genera trs and char acter indicators, 1 and" means responsive tojopera een er {the motor for closing the circuit between the-characterse respectively, v 21in a inessagetransmittmg' system, m graiime retes r ,5

de er al-acter" smetbrs electric impulse 10 pulses; normally openfielectriccircuits con ectijng respectively; andefiective when ergiz'edfto generates-t tr p umber of t e tr for causinghit" toindicate" auste sponsive td the *di'fiere tor mechanismrtrreseam "the ha caters to zeroy norniany 11* between fthe respective lse character indicates, an lect ric ating all the impulseflgfene for energiZingthe motor and V 1 connections between theliripulse ferja rs rid character indicators, and means responsive top 7 eration of the motor for first actuating the ch'a acter indicator reset mechanism, and then closing the circuit between the character selectors and impulse generators, respectively.

3. In a message transmitting system, an electric impulse generator and transmitter compris- I ing a circular series of spaced impulse contacts; a wiper arm movable concentrically of said con,- tacts to successively engage the same, a receiver including movable indicating means, reset mechanism for the receiver, circuitconnections for energizing the reset, an impulse circuit including the receiver and impulse generator, one side of said circuit being connected to the wiper arm, the

other side of said circuit including a pluralityot branches, each branch including a pair of normally open contacts, and being connected to one' of said impulse. contacts, an electric motor for driving the wiper armQmeans for selectively closing any, desired number-of said pairs of contacts in the branch circuits connected to the consecutive impulse contacts, means for energizing the motor, means actuated by said motor for ener-' gizing the reset circuit prior to engagement of the wiper arm with the first impulse contact, and

means for stopping the motor after a predetermined cycle of operation.

4. In a message transmitting system, an electric impulse generator and transmitter comprising a -circular series of spaced impulse contacts, a wiper arm movable concentrically of said con tacts to successively engage the same, a receiver, an impulse circuit including the receiver and impulse generator, one side of said circuit being concontact, and means for stopping the motor after a predetermined cycle of operation. ,7 v

5; In a message transmitting system, anelectric impulse generator and transmitter comprising a circular series 0! spaced impulse contacts, awiper arm movable concentrically of said contacts to successively engage thesame, a receiver including movable indicating means, reset mechanism .for the. receiver, circuit connectionsior energizing the reset. an impulse circuit including the reoeiver' and impulse generator, one side oi said circuit'being connected to the wiper arm, the other side of said circuit including a; plurality oi branches, each branch includinga pair of normally open contacts, and being connected toone of said impulse contacts, an electric motor for driving the wiper arm, selector means eflective when energized to close any desired numberof pairs of contacts in the branch circuits, means for energizing the. motor, means actuated by said motor for energizing the reset circuit priorto engagementj ot the wiper arm with them-st impulse contact, means'actuated by themotor tor en,- ergizing'said selector means to closesaid-predetermined connectedbranches of the impulsecircuit priorto engagement oi the wiper arm with thetirst impulse contact, and means for stopping the motor alter a predetermined cycle oi opera- 6. In a message-transmitting system, an electric impulse generator, a character display device, means responsive to electric impulses to actuate the character display. device including movable character selectors and movable character indicators, an electricmotor for driving the impulse generator, a plurality of normally open electric switches, each character. indicator having means for causing it to indicate a diiierent character responsive to the different numbers of impulses transmitted by its corresponding impulse generator, means actuated by the electric motor to successively engage the switches to thereby close the same, electromagnetic reset mechanism, for said character display device, circuit connections between one of said switches and said reset mechanism, circuit connectionsior energizing the impulse generator, includingv another 01! said switches, and a control circuit for the motorincluding. another of said switches for stoppingthe 1 motor after a predetermined cycle of operation, and means for energizing the motor, whereby to successively reset the character display device, energize the impulse generator and stop the motor after a predetermined cycle of operation.

CHAUNCEY L. CALKINS.

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