US2139079A - Code translator - Google Patents

Description

. 6, 1938. M. L. HASELTON CODE TRANSLATOR Original Filed June 7, 1928 9 Sheets Sheet 1 INVENTOR. 41 622 00 L/Yaselfum W V an)? ATTOR EYS.

Dec. 6, 1938.

Original Filed June 7, 1928 M. L. HASELTON 2,139,079

CODE TRANSLATOR 9 Sheets-Sheet 2 I INVENTOR.

J! 6/1912 Z. fi aseZfa/z WM/ w 4 ATTO NEYS.

Dec. M. L. HASELTON v, 2,139,679.

I CODE TRANSLATOR Original Filed June 7, 1928 9 Sheets-Sheet 3 QOOOOO @OGOOOO @0060 INVENTOR ATTORN EYS 6, 1938. M. HASELTON CODE TRANSLATOR ori inal Filed June 7. 1928 9 Sheets-Sheet 5 v INVENTOR Merton LII Melton WY E N R W T A w B Dec. 6, 1938. M. HASELTON 2,139,079

CODE TRANSLATOR Original Filed June 7. 1928 9 Sheets-Sheet 6 1938. M. L. HASELTON 2,139,079

' coma TRANSLATOR Original Filed Jung 7, 1928 9 Sheets-Sheet '7 6, 1938. M. HASELTON CODE TRANSLATOR Original Filed June 7. 1928 9 Sheets-Shae; 8

0 w mm mm w M B ra ATTOZNEY Dec. 6, 1938. M. HASELTON CQDE TRANSLATOR Original Filed June 7, 1928 9 Sheets-Sheet 9 INVENTOR Merfon Z .flkselfon ray/-75 24 40/16 21 IATTO NEY Patented Dec. 6, 1938 PATENT OFFICE 2,139,079 com: rnANsLA'ron Merton L. Haselton, Bye, N. Y., assignor, by meme assignments, to The Teleregister Corporation, New York, N.,Y., a corporation of Delaware Application June 7, 1928, Serial No. 288,477 Renewed January 29, 1931 12 Claims. (01. m-ssa) This invention relates to code translating apparatus and electrical circuits, such for example as may be used with code transmitting apparatus ior telegraphic or other signalling purposes. I This invention is particularly adaptable for use in connection with signal transmitting means, such as disclosed in my copending application Ser. No. 248,069, filed January 20, 1928, now U. 8. Patents Nos. 1,890,876, 1,890,877 and 1,946,531, or in the Swiss Patent No. 126,691, dated July 2, 1928, but it will be appreciated that the invention is adaptable for use in many other connections. The objects of this invention include the provision of apparatus and arrangements of the above indicated class, which will be accurate and dependable, as well as very rapid in operation.

Further and more specific objects, features and advantages will more clearly appear from the detailed description given below taken in connection with the accompanying drawings which form a part of this specification.

The invention consists in the novel arrangements, combinations of parts and electrical connections as hereinafter described, but by way oi example only, as being illustrative of a preferred embodiment of the invention.

In the drawings, Fig. 1 which extends over two sheets (Fig. 1a. and Fig. 112) comprises a schematic diagram of the circuit arrangements of one form of the invention.

Fig. 2 is an enlarged view of a portion of the terminal board forming a part of Fig. 1;

, Fig. 3 is a detailed sectional view taken on 311 line 8-3 of Fig. 2;

Fig. 4 illustrates additional circuit arrangements which may be incorporated with the circuits 01 Fig. 1;

Figs. 5, 6, '7 and 8 comprise a schematic dia gram of the circuit arrangements of one form of transmitter which may be employed with the code translator of Figs. 1 to 4;

Fig. 9 is a diagrammatic view of the various keys employed with the circuits disclosed;

Fig. 10 is a sectional view illustrating typical selector or actuation keys which may be employed with the transmitter and codev translator;

Fig. 11 is a sectional view showing the construction of typical stock range keys employed with the transmitter of ,Figs. to 8; i

Fig. 12 shows one form of impulse counting device which may be used in connection with the circuits of Figs. 5 to 8';

Fig. 13 is a sectional view taken substantially 55 along the line i2l2 01 Fig. 11;

the

Figs. 14 and 15 illustrate uniform of receiver which may be employed with the transmitter and code translator herein disclosed; and

Fig. 16 shows certain details of the contact mechanism referred to in Fig. 14.

The arrangement here shown is designed to transpose predetermined arbitrary abbreviations comprising a plurality of letters into a predetermined numerical abbreviation or code system involving the use or a plurality oi digits. With 10 the particular apparatus shown in the drawings, for example, abbreviations such as used to designate stocks or commodities, or other items, and comprising one, two or three letters, may be translated into a numerical abbreviation or code 15 system embodying a plurality of digits. An arrangement of this class is desirable for use in connection with transmitting apparatus for controlling automatic brokers boards and the like, such as referred to in my copending appli- 20 cation above mentioned, for the reason that the public and employees of the stock exchanges and financial houses have become accustomed to designating the various listed stocks and com modities by groups of abbreviations. or letters of 25- the alphabet, while on the other hand, automatic transmitting apparatus, generally speaking, may be more readily controlled it a numerical and decimal code is used.

However, in the control of automatic brokers 30 boards and other signalling equipment, it is gen- "erally highly important to transmit the information or signals not only with a high degree of accuracy and speed, but also immediately after the occurrence of the events. With the present invention the transmitter or control keyboard may be arranged with the keys designated by letters of the alphabet so that the operators need not take the time necessary, nor otherwise concern themselves with the translation of codes; yet the actual code transmitted over the line wires may be numerical. 4

In the drawings three groups of operating keys as at iii, H and ii are provided. These keys of course may be suitably grouped together to form a keyboard, as for example according to the general construction disclosed in my copending application above referred to, except that the keys will be designated by letters instead of by numerals. It will be observed that each of the three groups of keys includes one key for each of the twenty-six letters of the alphabet and one key designated Three groups of operating busses are indicated at i3, ll and ii respectively, each group comprising ten wires.

one wire being thus provided for each possible number for each decimal or digit character. It will be understood that these operating busses may be connected to control any desired indicating or transmitting apparatus, a multitude of different control operations or indications being made available merely by applying ground connections to diiferent combinations or groups of busses, such combinations of ground connections being applied by the operation of the relay circuits hereinafter described. For example, the wires I3, I4 and I5 may be connected to operate digit storing relays such as now utilized in the transmitting devices of automatic brokers board systems and as disclosed in my said copending application, that is, whenever a ground connection is applied to one of these wires, a digit storing relay may be operated in the same manner that the digit storing relays are operated by the units, tens and hundreds selector keys in saidcopending application.

It will be understood however that the use of the code translator comprising this invention is not restricted to uses with any particular form of transmitting or indicating means.

It will be understood that wires I3, I4 and I! might also be connected to control other forms of transmiting apparatus well understood from the prior art. Assuming that a stock designated by the abbreviation TAV is to be selected, the operator presses the key T of the group II), the key A of the group I 2, and the key V of the group II successively, and the apparatus about to be described functions to translate this abbreviation into a desired predetermined numerical abbreviation such as 822, and accordingly a ground connection is applied momentariy to the eighth wire of the group I3, and also to the second wire of the group I4 and the second wire of the group I5. Thus, in effect, although alphabetical keys have been pressed, the result is equivalent to what might be obtained if an operator mentally translated the abbreviation TAV into the abbreviation 822 and then pressed numerically designated keys, as of my copending application. Similarly, if a stock designated by the letter A is to be selected, then the operator presses the key of group iii, the key of group I2 and the A key of group II, with the result that the abbrevlation A is translated into a predetermined numerical abbreviation, for example, 140, and the ground connection is applied to the first, fourth and tenth wires respectively of the groups I3, I4 and I5.

In brief, the apparatus comprises groups of holding relays as at I6 and I1, one of such relays being provided for each of the keys of the groups I0 and I I, these holding relays being all arranged to be released upon the operation of a release relay I8. Each of the keys of the group I2 is arranged to control a corresponding twenty-eight contact relay as at I9. A grid terminal board is provided at 20 having a number of horizontal busses as at 2i corresponding to the number of keys in the group ID, that is, in this instance twenty-seven, and having twenty-seven vertical busses for each one of the relays I9. These busses are all insulated in respect to each other and are arranged to receive interchangeable readily detachable connections as at 23, each such connection providing for contact with one vertical bus and one horizontal bus at the point where such busses cross. Fig. 2 is an enlarged view of a portion of one of the terminal boards as indicated at 20 in Fig. 1, typical horizontal and vertical busses being indicated at II and 4| respectively, the busses being insulated from each other by reason of their spaced apart arrangement. Fig. 3 is an enlarged view of a typical one of the interchangeable readily detachable terminal connections 23 for applying lead wires respectively to the horizontal and vertical busses at the points where the same cross each other. The two lead wires as at 24 and 25 from each detachable connection 23 may run respectively to relays as at 26 and 21. It will be observed that a pair of relays as at 28 and 31 is provided for each stock or other item to be chosen and such relays may be readily interchanged from time to time in respect to various letter abbreviation combinations, and also in respect to the various numerical combinations. That is, to interchange one of the relays in respect to the letter abbreviations, it is merely necessary to remove the corresponding detachable terminal member 33 from one of the bus intersections on the grid 20 and replace the terminal at another intersection corresponding to the new letterabbreviation which is to be represented by the relay. On the other hand, if it is desired to interchange one of the relays. in respect to the numerical abbreviations, the connections to relay contacts as at 4|, 46 and 41 may be removed from the particular busses I 3, I4 and ii to which the same are connected, and reconnected to the desired new combination comprising one each of the busses I3, I4 and II. For example, if it is desired to have relay 51 represent the numeral abbreviation 2-4-0, the lead wires which are shown as running to the 5th, 9th and 6th busses respectively, are removed from these busses and applied respectively to the second bus of group I3, the fourth bus of group I4 and the lowermost bus of group I5. These relays, when actuated, function to momentarily ground certain of the wires I3, I4 and I5, representing the desired numbers, as will be hereinafter further explained.

The operating circuits will now be traced and described in greater detail. Assuming the key of group III designated as Z is operated, the first relay I6 will pick up through a circuit from ground 28, key switch 29, connection wire III, coil of relay I6, to battery and ground at 3|. This relay will thereupon close a holding circuit for itself, running from the battery and ground 3I, through holding contacts 32 and a circuit connection 33 running to a switch 34 at the release relay I8, and thence to ground 35. Therefore the relay I5 when thus energized, remains energized until release relay ll opens its holding circuit by reason of the opening of the switch 34. Yet as will be hereinafter explained, the release relay I3 does not operate until the desired connections have been applied to the bus wires I3, I4 and IS. The holding relay I8 when energized also closes a circuit from the battery and ground 3|, through a switch 36, to a circuit connection 31 running to the Z horizontal bus of the grid terminal board 20.

Accordingly, current is applied to this bus and to all the interchangeable connection wires (such as at 24) which may be connected thereto. While such wires remain energized, the operator presses one of the keys of the group I3. If the A key is thus pressed, the relay I9 (A) will be energized and its holding circuit will be established through circuit connection 33 under control of relay I8 in the same manner as with the circuit connections above described. Also, this relay II serves to connect the group of wires 33 to the 75 selected group A of vertical busses, Fig. 1b. The contacts of the relay It (A) are normally in open circuit condition, but when closed by the energization of the relay the contacts connect the twenty-seven vertical busses of the group A to the group of relays i1, Fig. is. If the A key of the group of keys Ii is pressed, the relay l'l connected thereto will be energized and locked up over its holding circuit, with the result that the vertical bus shown at 40, Fig. 117, will be energizedand the relay 21, corresponding to the stock ZAA will be operated, thus operating the associated relay 28 and causing ground to be applied to conductors 5-10 of the busses i3, i4 and II.

The numerous relays l6, l1 and It in each case operate in the same manner as above described.

The twenty-eighth or last contact as at i9 on 'each of the'relays i9, provides for the establishment ofa holding circuit for the corresponding relay, such circuits running from the relay contacts I! to the connections 83,,whereby the release relay i8 controls'the release of the relays I! as well as the holding relays it and il.

It will be understood that although connections are shown for but three of the relays i9, namely those designated A and B, the connections may be extended in the manner indicated on the drawings to provide for the entire group of keys i2. Also it will be understood that the keys ill, ii and i2 might be designated by character systems other than alphabetical systems. For example, one arbitrary numerical ab-,,'

breviation or code system might be translated by the apparatus into another arbitrary or systematic numerical code system, and in that event the groups of keys I0, ii and i2 might each include ten or more keys with a corresponding number or associated relays. It will -be further understood that if desired, the necessary keys on the keyboard might be pressed simultaneously, thus avoiding the necessity of holding relays.

In the particular example of operation above described, if there is a detachable plug connection applied on the grid terminal board at the intersection of the lower horizontal bus with the vertical bus 40, the connection wires 24 and 25 will be both energized, but this will be the only intersection on the terminal board where both busses will thus become jointly energized, and accordingly the relays 28 and 21 associated with the particular chosen intersection will be operable to the exclusion of the corresponding relays for all other stocks or items. The circuit from the vertical bus 40 may therefore continue through connection wire 25, through the coil of the chosen relay 21, thence to ground return as at Al. The relay 2'! thereupon picks up and closes a switch 42, which completes the circuit from the horizontal bus through the connection wire 24, switch 42, relay 28, to a ground return at 43. At this moment, relay 26 "picks up and. acts to momentarily close four contacts as at 44, 45, 46 and 41. The contacts 45, 46 and 41 respectively serve to connect the ground 43 to the desired wires i3, i4 and i5 representative of predetermined digits suchas Sill, corresponding to the arbitrary abbreviation ZAA. At the same time, the closing of the switch 44 applies the ground 43 to a connection wire 48 running to the release relay [8, and thence to battery and ground as at 49. The release relay i8 thereupon "picks up", opening its switch 34 and releasing the holding relays I, i1 and it as above stated,

with a consequent deenergization of the chosen terminal board busses and relays 20 and 21. But meanwhile, the desired wires of the groups it, it and II will have been momentarily grounded, thus" permitting the storing of the desired nu-' merical abbreviation in the storage relays or other transmitting apparatus as above referred to.

With this apparatus it will be observed that any letter abbreviation having one. two or three letters may be translated into any predetermined desired numerical abbreviation from zero to 999, and the particular number abbreviation into which the letter abbreviation is translated may be chosen or changed at will merely by changing the point at which the relays as at 2C and 21 are connected to the interchangeable terminal board. Furthermore, although a total of 27 x 27 x 27 letter abbreviations may be readily provided for on the keyboard, it is necessary to provide pairs of relays as at 20 and 21 only for such stocks or other items as are actually to be selected, and the number of these relays may be readily increased from time to time as the number of items or other signals to be quoted increases with the extension of business. Also, in certain signalling systems, it will be appreciated that athree letter abbreviation will be unnecessary. In that event, one of the groups of key switches might of course be eliminated. In other cases it may be found unnecessary to ever use certain letters of, say, the group of key switches l2, and in that event such keys need not be accompanied by one of the relays as at it and associated connections, and the corresponding terminal board section i may also then be eliminated. To this end the terminal board may be made in detachable sections, each section being detachably connected to adjacent sections as indicated at 50. The constructional details of the grid terminal board may of course vary within wide limits, depending upon manufacturing considerations, but the details of one simple form of construction are indicated in Figs. 2 and 3.

Circuits will now be described adapting this apparatusto the translation of codes for special items, such as preferred stocks. A special preferred stock key is provided at 5! and operates in conjunction with a holding relay 52 having a holding circuit contact 53 and a. working contact 54 for applying a ground and battery as at 55 to a preferred stock but 56. For each item for which two or more types of securities, for example, are to be quoted, a corresponding number of relays may be provided as at 51 and 58. The relay 58 may correspond in function to the relays 26 above described and the relay 58 is provided to shift a ground connection 60 out of circuit with the relay 58 and into'association with the relay 51 corresponding to the preferred quotation or the like. That is, the circuit through the relay 58 normally runs through contact M of relay 59 and thence to ground 60 when the preferred key has not been actuated. .However, when the preferred key is actuated preliminary to the normal operation of the keyboard, the relays which are provided for all preferred stocks or special issues, etc., are all energized with the result that for the particular chosen item the relay I1 is energized in a manner similar to the action of relays 20, the circuit passing through the makef; contact of relay 59 and thence to ground 60. Hence, when the "preferred" key has been pressed, only the preferred issue of a particularselecteditemisquoted. Assoonasgs either of the relays 51 or 58 is energized, the release relay l8 operates in the manner above described to restore the entire apparatus to normal including the preferred stock holding relay 52. With this arrangement it will be observed that the preferred key may be pressed at any time prior to the pressing of the final alphabetical key H and when the key II is finally pressed, the circuits will immediately complete the desired operations and actuate the release relay I8. With the preferred key thus arranged to be actuated prior to the actuation of the keys II, it becomes unnecessary to utilize holding relays in conjunction with the keys II.

It may be noted that where relays as at 21 for a large number of items are to be all operated from a single one of the terminal board busses 22, it may be desirable to divide such relay load into a number of branches. That is, it will be understood that when due to the operation of keys ii and I2, one of the vertical busses 40 on the grid terminal board is selected, all of the relays such as at 21 which happen to be connected to such bus will be energized. If, as will occur in some instances, a plurality of relays such as at 21 are all connected to one of these vertical busses, the selection of this bus will result in the simultaneous energization of all'of these relays, thus establishing a considerable load carried by the corresponding relay contact 39. For example, one of the relays 21 might be utilized to actuate simultaneously several groups of the other corresponding relays associated with the same vertical bus. With the load thus divided into groups, the current to be broken by the contacts 39 may be substantially minimized so as to prevent arcing.

. Fig. 4 illustrates one manner in which this load may be divided between a number of contacts. In this figure the relays corresponding directly to those indicated in Fig. 1 are designated by the same reference characters. It will be noted that relay 21' is connected to be operated through a lead wire as at 25 directly from the corresponding vertical bus, relay 2'! having a plurality of contacts 21" equal to the number of groups of relays 21 which are to be controlled thereby. It will be apparent that with this arrangement that the current load which would otherwise be carried by the corresponding contact 39, will be divided between the several contacts 21".

The apparatus is therefore adapted with a wide degree of flexibility to various operating conditions, and the number of parts may be readily enlarged upon or reduced from time to time to accommodate changed conditions, with the result that space and maintenance need only be provided for such apparatus and parts as are actu ally necessary at various times.

Referring to Figs. 5 to 13, the transmitter arrangement shown performs the function of transmitting a group of distinctive current variations over the line wires Ll to L4, Fig. 6, under control of the translator of Figs. 1 to 4, which operate to control the identifying or selective means at the various receiving .stations. The transmitter then functions to transmit a group of current variations for actuating the particular indicators chosen by the selector means. Also, the transmitter provides means for rendering such actuating current variations effective to operate with the open", high", low" or last quotation indicators, or, if desired, either the high and last" or the low and last" together.

The keys I 0, l2 and I I of the translator, Figs. 1a, lb and 9, which effect the stock selection cause ground potential to be selectively applied to one of the wires in each of the groups l3, l4 and I5, as hereinbefore set forth, and these groups respectively control the hundreds, tens and units storage relay selectors of the transmitter circuit, the units selector being shown in the upper portion of Fig. 5. As will be noted from Fig. 6 the transmitter is capable of transmitting four digit stock selecting numbers, and since the illustrative embodiment of the translator disclosed employs only three digit stock selecting numbers, the thousands selector impulse counter in Fig. 8 is not connected to a group of thousands storage relay selectors but automatically sends zero for the thousands digit by reason of the fact that the zero contact of the impulse counter is permanently grounded. The zero contacts of the hundreds, tens and units selector impulse counters of Fig. 6 could likewise be permanently grounded, but this is unnecessary because of the fact that the translator causes ground potential to be applied to these contacts whenever zero appears in the stock selecting numbers.

As shown in Fig. 9, four groups of actuating keys, arranged in four tiers, e, j, g, and h, corresponding respectively to the four digits of each quotation, and also corresponding respectively to the same four line wires above referred to, are provided for causing ground potential to be selectively applied to one of the contacts of the hundreds, tens, units and fractions actuation impulse counters shown in Fig. '7. The wiring diagram of the hundreds group of actuation keys is shown in the lower portion of Fig. 5. It will be noted that in each of these tiers ten keys are provided and numbered respectively from 1 to 9, the th key bearing the indicia zero. These keys provide respectively for sending over the several line wires groups of actuating impulses varying in number from 1 to 10 depending upon which of the keys has been pressed. In the actuation key group it is desirable to provide for the setting of the quotation indicators either at blank or at "zero. With the keys arranged as shown in Fig. 9, the pressing of the zero actuation keys functions to transmit groups of ten current variations for setting the corresponding chosen quotation digit indicators at zero, whereas if keys are not pressed r in the actuation key groups, the digit indicators will remain at positions exhibiting blanks, the indicators after being selected having been automatically restored to blank positions, by means hereinafter described.

It will be obvious that actuation key tiers e, j and g, bear indicia which may be used respectively to correspond to the hundreds, tens and units of the quotation transmitted, while the tier It bears indicia corresponding to various fraction values, either decimal or common, depending upon which characters are used on the corresponding quotation digit indicators which are selected at the receiving stations. For example, the ten keys of this tier may be labeled with the characters .1 to .9 and 0 and keys from .1 to .7 may be also labeled with common fraction characters from to V, respectively.

On the group of keys shown in Fig. 9 an additional key 2', similar in construction to the keys above described. but bearing the indicia error" may be used to operate circuit arrangements for releasing the connections established by reason of the previous pressing of any of the selector or actuation keys. Another group of selector keys be by the use of two or more keyboards, but acmay also be provided as indicated at k, which are utilized to determine whether the actuation impulses shall function to operate the "open", "high", "low", "last", "high and last" or "low and last" quotation indicators.

The keys may be operated as follows: For example, if the operator wishes to transmit for a three letter stock or other item a quotation comprising 106%, he may press the three corresponding letter selector keys of the three selector tiers, andalso press the actuation keys 1-0- 8% respectively of the four actuation tiers. After all of these keys have been pressed, if it should be discovered that one or more of the keys have been pressed by mistake, the operator would before a previous pressing of one of the keys It will continue to be engaged in transmission'of signals and will be unaffected by the "error key.

The operator will next press the desired seven, .keys or a lesser number. Then if none of the keys I: are in depressed condition. one of the same may be now pressed by the operator, which will start the sending of distinctive groups of impulses over the line wires corresponding to the particular seven selector and actuation keys which have been pressed. Immediately upon pressing one of the keys of the group is, such key as pressed will be locked down and the other keys of this group will be locked up, such locking continuing until the transmission of the distinctive groups of current variations is automatically completed.

Meanwhile, however, during the automatic transmission of these groups of impulses, the operator may reset the selector and actuation keys to correspond to any desired new quotation which is to be next transmitted. Then as soon as the locking of the keys of the group R: is released,

- another key of such group may be pressed for starting the transmission of the second quotation.

It is therefore unnecessary for the operator to await the actual transmission of a quotation over the line wires before setting the selecting and actuating keys for the next quotation. and accordingly substantially the maximum possible speed of operation of the keyboard is obtainable. That is, the speed of operation of the keyboard may be limited only by. human skill in operating the same. Yet the locking of the keys of the group It automatically prevents confusion of the digits of one quotation with those of the succeeding, and since the selector and actuation keys may be pressed in any desired sequence or concurrently at the operator's convenience, in any event thereis no possibility of confusion of the selector impulses with the actuation impulses by reason of false settings.

Inasmuch as provision is made to actuate the keyboard for selecting and sending a new quotation before the previous quotation is completely transmitted, it is apparent that storage means is necessary for storing the information of each setting, at least for a limited time. In my aforesaid patents provision for such storage is made in the form of a perforated tape, the perforations being made prior to actual use of the tape and being-distinctively arranged to indicate the quotations of desired stocks. Another manner in which such storage could be accomplished would other group.

cording to the particular embodiment of my invention here disclosed, I have obviated the necessity for a plurality of keyboards, and instead have provided two sets of relays operated upon alternately by a single keyboard. Typical groups of relays for this purpose are designated on Fig. 5, as Groups I and II, the operation of which will be hereinafter described in detail.

In the system described in my aforesaid pat"- ents, the choice as between open, high". "low" and "last", "high and last or "low and last is accomplished by establishing various combinations of polarities on the four line wires. That is, when the transmission of signals is initiated, a sustained potential on each line wire of a predetermined polarity is set up, then the subsequent selecting and actuating current variationstake the form of potential interruptions or drops on the line wires. With the keyboard and circuit arrangements of this invention, such sustained potentials are established by the pressing of the keys k, which at the same time initiate the transmission of current variations and shift the selector and actuation keys from cooperation with he storage relays of one group to those of the Since the chosen one of keys is remains depressed until the sending of one quota- "last indicators, depending upon which key It is pressed. Stordae relay circuits The circuits of the digit storing relays are largely indicated on Fig. 5. At the top of Fig. 5 the two alternately used groups of the relays for the units selector are shown. It will be understood that similar groups will be provided respectively for the tens and hundreds digits of the stock or item designating numbers. These additional relay groups are attached respectively to the wires bearing the indicia tens and hundreds on Fig. 6. For simplicity such additional groups of relays are not shown as they are constructed and arranged in the same manner as those shown at the top of Fig. 5.

Likewise, at thelower part of Fig. 5, the two alternately used groups of storage relays for the hundreds actuation keys are illustrated, additional groups (not shown) being provided and connected to operate over the wires designated as tens, units and fractions on Fig. 7.

The miniature numbers used designating the keys, relays and impulse counter contacts are considerably smaller than the numerals used in designating other parts of the apparatus and should'not be confused therewith.

Referring to Fig. 5, we will first assume that all relays are deenergized and that one of the selector wires, for example, the wire corresponding to the digit 9, of the group It has been grounded by the operation of the translator. The circuit is established from ground at the translator, through one of the normal contacts ")5 of a transfer relay I06. the coil of a digit storing relay I01 (relay for digit 9) to battery and ground at I08. Digit storing relay I01 therefore operates and closes contacts at I08 and H0. Contact H0 prepares a circuit to the transmitter but this cir- 15 6 2,1se,ovo

cult is however open at a contact II I of a transfer relay II2. Contact I03 in closing establishes a holding circuit for relay I0'I which is as follows: battery and ground at I08, coil of relay I01, contact I03, a normal contact II3 of the transfer relay II 2, an error release bus IIO, thence to a normal contact II! of an error release magnet H6, Fig. 7. This circuit holds up digit storing relay I0'I but conditions its circuit so that it may be released whenever error release ma net H8 is energized.

In a similar manner any digit storing relay may be locked up over the error release bus IIO by pressing the keys of the translator. It may be noted that digit storing relays in Group II as at III are disconnected at normal contacts H8 of a transfer relay H0. Therefore, pressing of the translator keys has no effect at this time on any of the relays in Group'II. The error release bus H0 as well as a transmission release bus I20 and a transfer bus I2I are common to all digit storing relays, both for selection and actuation.

If, now, the transfer bus I 2I is grounded, all the transfer relays such as I08, H2, H9, I22, I23 and I20 are energized, since all have one terminal connected to the battery and ground I08 and their other terminal connected to the bus I2I. This ground may be placed on the transfer bus at the proper time by the transmitter per se, as explained hereinafter. The transfer relays therefore open all normal contacts as at I00 of relay I06 and I22 of Groups Nos. I, and close make contacts as at I I3 of relays I I9 and I23 of Groups No. II. Also the contact I03 of relay I01 which is closed, is transferred from the ground on error bus IIO to another ground on the transmission release bus i20, by the closing of a contact I25 and subsequent opening of the contact II3 of relay H2. The holding circuit of relay I0! is now completed over the transmission release bus I20, (see Fig. 7)., and a contact I20 of a transmission release relay I2'I to ground. This relay is energized by the transmitter when all impulses for one quotation have been transmitted, as explained hereinafter. The relay I I2 in closing also closes the contact III, Fig. 5, thereby placing a ground on the 9th contact of-a unit selector impulse counter, through the contact N0 of the relay I07, and through a sender bus as at I28 to the 9th contact of the units selector impulse counter as shown on Fig. 6.

The reverse of the above described circuit changes occurs by the operation of transfer relays II9, I23 and I20. That is, the ground at contact I25 of relay I20 is removed from sender busses I28 by the opening of the contact I29; also the holding circuit of all of the Group II relays is transferred from the transmission release bus to the error release bus by operation of the contacts I33 and I3I of the relay I20; This places the Group 11 digit storing relays in condition to record such digits as are next chosen by the translator.

The operation of the digit storage relays of the actuation groups may be the same as of those above described. However, as above explained, it is desirable to provide ten actuation keys IOI in each group, which selectively apply ground from I02 and wire I03 to one of the ten wires I00, and accordingly ten storage relays are provided in each actuation group, and furthermore, as shown in the lower portion of Fig. 5, relays I32 and I33 have been added which are in series with the holding circuits of the groups of digit storing relays. The relays I32 and I33 correspond to the blank spaces on the indicator units selected at the receiving stations. Parts of the actuation storage relay circuits which are similar to corresponding parts of the selector storage relay circuits are identified on the drawings by the same numerals accompanied by prime marks.

If no keys are pressed, relays I32 and I33 do not operate and the blank wire of the actuation bus group I23 remains grounded through one or the other of contacts I32 and I33. As-

suming, however, that a contact of Group I has been pressed, then the circuit of relay I32 will be closed either by way of error release bus 0' or transmission release bus I 20', through either contact I I3 or I25, thence through the coil of relay I32 to one of the contacts as at I00 of the particular storage relay which has been actuated, thence through such relay to battery and ground at I08. Therefore, when certain of the actuating keys of Groups Nos. I are pressed, the relays such as at I32 (of the hundreds, tens, units and fractions groups) cause the ground connections to be removed from the blank" actuation busses, but when no actuation keys are pressed, the relays I32 being inactive permit the contacts I32 to remain closed. The contacts I32 complete their circuits through other contacts as at I32 which are under the control of transfer relays H2. When the actuation keys of Groups Nos. I are being set, the transfer relays 2' are inactive and hence contacts I32" remain open until a transfer to Groups Nos. II is made, whereupon energization of relays II2 closes contacts I32" for effecting completion of the grounding circuits through contacts I32 whenever no keys have been ,pressed in the corresponding groups. Then, as will be hereinafter explained, the corresponding contact marked on the actuation impulse counters being grounded, will cause the impulse counter to sendno impulses, thus leaving the corresponding selected indicators at the receiving stations in positions to indicate blanks. Actuation storage relay Groups Nos. II are arranged in a similar manner, that is, when transfer is made from Group I to Group II, relay I20 will be energized, thus opening a ground circuit through a contact I33. Then if keys are not pressed in Groups Nos. II, the relays I33 will remain idle permitting the group circuit to be conditioned through closed contacts I33. Thereafter upon transfer back to Group I, relay I20 will be deenergized, thus closing the ground circuit through the contact I33-', contact I33, blank actuation bus, to the contact on the corresponding actuation impulse counter, such ground being maintained during the existing actuation cycle and until the next transfer, but not interfering with the resetting of Groups Nos. I.

As to constructional features and details of the digit storing relay groups which are not herein described at length, reference may be had to various prior art patents and publications, which describe somewhat similar arrangements, but modified and adapted to a distinctly different purpose, namely, automatic telephone switching, as explained for example by H. H. Harrison in his book on Automatic Telephony, Longmans Green 8: Co., London, 1924, pages -134.

It will. now be apparent that by the use oi the storage relays above described, the actual transmission of current variations may be provided for to take place simultaneously with the resetting of the keys for a subsequent quotation.

The function of the storage relays it will be observed is to apply a ground connection to proper contacts on the selector and actuation impulse counters. That is, referring to Figs. 6 and 7, it will be notedthat an actuation impulse counter is provided respectively for each of the groups of transmitter busses I 28 and I818, such impulse counters having arcuately arranged groups of contacts corresponding respectively to the units, tens, hundreds and thousands selector digits and the fractions, units, tens and hundreds of the actuation digits. Such impulse counters will be hereinafter described in detail.

Assuming now that the operator has pressed the desired selector and actuation keys, he is now ready to start the actual transmission of the current variations which will correspond in number to the designating numbers of the storage relays of the various Groups Nos. I which have been energized, through the busses I3, I4 and I5 of the translator circuit, and the price keys.

"Starting keys and choice "open, "high, "1010 and "last indicators Referring now to Fig. 8, the next operation is the depression of any desired one of the six keys 84 (which have been designated as group It in Fig. 9 in order to distinguish from the numbered digit keys). For example, if the "open key is pressed, this completes a circuit from a ground at I35 through contacts of a switch I34 through a corresponding one of the connection wires I35 to one of the corresponding Potential selector relays as at I31, the winding of a starting relay I38 to battery and ground I39. The relay I38 thereupon picks up" and completes through a contact I40, a circuit from the transmission release bus I20, through a key release magnet I to battery and ground at I42. The holding magnet I H (see Fig. 11) operates to displace a template as at I43 against the tension of a spring I44. The template I48 is shaped so as to engage with the various keys of group It as follows: When for example, a key as at I45, Fig. 11, is depressed andthe magnet I is thereupon energized as above explained, the template will engage the stem of such key in a manner apparent from the drawings and prevent the same from being raised until the magnet is deenergized. At the same time keys which are in raised position, as for example key I48, will also have their stems engaged by the template I43 in the manner shown, whereby such keys are held against being depressed until the magnet MI is deenergized.

Referring now again to Fig. 8, concurrently with the actuation of the relay I38, the particular relay I31 which has been energized will cause a group of four contacts as at I41, I48, I49 and I50 to be closed. The relays I31 are each arranged with these groups of four contacts so as to apply a ground connection to one or the other of the other of the two wires of each 'of four pairs of connection wires II. These pairs of wires are in turn connected respectively to pairs of line polarity relays as at I52 (see Fig. 7), so that when certain of the groups oi contacts I41, I 48, I49 and I50 are closed, the corresponding relays I52 operate to connect the four main linewires, LI, L2, L3, L4, each to either a source of negative potential I51 or a source of positive potential I50. This operation it will be understood serves to apply the sustained potentials to the lines, of such polarities as to determine whether open", high", "low or last indicators will be operated by subsequent current variations, and also with certain combinations of potentials topermit the operation of high or low" indicators with the "last indicators at the receiving stations. 0n Fig. 7, a tabulation is given of suitable line potentials which may be applied to permit the desired control of the receiving indicators arranged as described in my aforesaid application Ser. No. 244,873. For example, if the last key is pressed, potentials will be normally applied to the line wires LI, L2, L8 and L4, respectively, as follows: plus, minus, plus, minus. With these potentials, any actuation impulses transmitted over the lines will serve to operate the "last receiving station indicators.

Now, if it is desired to operate the transmitter in conjunction with receiving circuits such, for

example as shown in Fig. 12 of my Patent 1,890,876, issued on my, application Ser. No. 244,873, the line polarities may be first established for "restoration" purposes as indicated in the tabuation of Fig. 7 of this application. After the necessary number ofrestoration impulses are transmitted in a manner hereinafter explained, the polarity of line L3 may be quickly reversed, whereupon the line potentials will be such as to permit "actuation" of the chosen indicators at the receiving stations. This shifting of the polarity of line L8 is accomplished by the operation of a relay I53 acting in conjunction with relay switch members I54, I55 and I56, the operation of which will be hereinafter explained in detail. The association of the line wires with the line polarity changing switches and the sources of potentials I51 and I58 is fully explained in my aforesaid Patent 1,890,876.

Selector impulse transmitting circuits At the same time that the line potentials are being established as above explained, the starting relay I38 (see Fig. 8) also closes a contact I59 which, it will be observed, connects a ground with a "starting wire I60, (see Figs. 6 and 7) which, when energized, initiates the transmitting action through the medium of relays IGI and I62. The relay IBI may be of a slow acting type with a copper slug on its armature end causing the relay to be slow to pick up. The relay I62 may be of the ordinary quick acting type. Upon energization of the starting wire I60, the relay I8I "picks up after a short delay, but only after the quick acting relay I52 has picked up through a normally closed contact I63, 'such circuit running from ground through contact I59, starting wire I80, contact I83, coil of relay I62, a contact I84, to battery and ground at I65, the contact I54 being under the control of a selector impulse counter stepping magnet I65. The relay I62 then is provided with a holding circuit by reason of the closing ofa contact I81 which connects the relay I82 directly to ground in lieu of having its circuit run through contact I63 and the starting wire to ground. Upon the actuation of relay I6I the starting wire circuit is broken at the contact I03. This may occur at approximately 0.1 second after relay I02 has "picked up" and causes the circuit until the transmission of current variations for one quotation is completed; thereafter the same circuit is opened at contact I59 until the starting key is pressed for the following quotation. Thereby, repetition of the actuation of the selector circuits is prevented until a starting key is again pressed. Before proceeding further with of the starting wire to remain open at this point the transmitting circuits, the impulse counter construction will be described:

Impulse counter construction.-The impulse counters or switches may take the general form of the well known rotary line switches as used in automatic telephony switching, one example of such a switch being shown in the above cited work by Harrison on page 41. Inasmuch as the details of construction of such switches are well known, only the features particularly adapting such switches to this invention will be here described.

As shown in Fig. 12, this switch may be of the rotary step-by-step type having five double rotary wipers arms as at I13 and one single rotary wiper arm as at I14. (See Fig. 6 for schematic illustration.) These wipers may all be mounted in alignment on, but insulated from, a single shaft as at I15 (see Fig. 12), cooperating with a ratchet I16 and pawl I11 so as to be rotated step-by-step always in the same direction. The pawl in turn may be driven by an armature as at I18 of the stepping magnet I66. The pawl as advanced by the armature engages one of the teeth of the ratchet I16 and as the magnet I66 is deenergized, the ratchet together with the wiper arms are rotated one step in the direction of the arrow by the force of a spring I18 acting against the pawl member. Reverse movement of the ratchet and wipers may be prevented as by a spring dog I80.

The outer ends of four of the wipers I13 respectively are arranged to come into contact successively with thirteen contact points as at I6I, arranged as shown in arcuate groups. Two of the wipers, namely one of the double wipers I13, and the single wiper I14 come into contact with continuous arcuate segments I82 and are used for the control of the transmitters and the transfer bus as hereinafter explained. The manner in which the switch I64 above mentioned is associated with the stepping magnet I66 is indicated in Fig. 12, the switch I64 being arranged to open its circuit whenever the magnet I66 is energized.

The operation of the selector impulse counter or switch will now be explained in connection with the diagram on Fig. 6. It will be observed that for clearness on Fig. 6 the step-by-step switch of Fig. 12 has been shown schematically as divided into six groups of parts, one bank of contacts or else a segment being included in each part. The manner in which segments I82 cooperate with wipers I13 and I14 is shown. That is, wiper I14 is normally out of contact with its segment I82, but when the wiper I14 is advanced in the direction of the arrow through, say, approximately one-half step, then contact will be made with its corresponding segment I82 (which is grounded), and such contact will be maintained throughout the succeeding one-half revolution of the wiper, whereupon such contact will be broken during the next one-half revolution. The wiper I13 (having double arms) above referred to, which cooperates with another of the segments I82, it will be observed, normally has both its arms out of contact with the segment I82. However, uponrotation of such double wiper through an angle equivalent to substantially one full step, contact will be made with the segment I82 (which is also grounded) and such ground connection will be maintained until the wiper rotates through one-half revolution to another normal position. Upon rotation of the wipers through the succeeding one-half revolution, the above action will be repeated. The manner in.

which the other wipers I13 cooperate with the various contacts I8I is apparent from the above description taken in connection with the drawings.

Reverting again to the operation of the selector transmitting circuits: relay I62 in "picking up" also closes a contact at I68, which conditions an impulsing circuit from ground to the make contact I68, through the winding of an impulsing relay I68, to a make contact I10 of a motor driven interrupter I12 and thence to battery and ground at I1I. The interrupter I12 may comprise a motor operated cam as shown for closing the switch I10 during intervals of time substantially equal in length to the desired length of the current variations or impulses which are transmitted. After the preparation of the circuit through impulsing relay I68 by the closing of contact I68, subsequent operations of the interrupter I12 cause groups of impulses to be generated in the circuit.

When the first impulse from the interrupter I12 causes energization of magnet I69, this magnet closes contacts as at I84 and I85. Contact I84 merely grounds a circuit without immediate effect, since it will be noted that its circuit remains open at contacts I86, I81, I88 and I88. Accordingly, if the first impulse generated by the interrupter I12 should happen to be of abnormally short duration, such clipped impulse cannot be made effective to cause false operation of the transmitter. Meanwhile contact I85 closes the circuit through the stepping magnet I 66, such circuit comprising battery and ground at I65, magnet I66, contact I85 to ground. This energizes the magnet I66 and causes the wipers I13 and I14 to be advanced the-initial step. Concurrently contact I64 is opened by the energization of magnet I66 and consequently, relay I62 is dropped out, releasing its holding circuit at the contact I 61 and also releasing its contact I68. The releasing of contact I68 in turn removes the ground return of the circuit of impulse relay I68. However, another ground return is applied to the winding of impulse magnet I68, placing the same now under control of the impulse counter, by the action of a relay I80 connected in circuit with a relay I8I and battery and ground at I82, and operating to close a contact I 83, which in turn connects the coil of relay I68 to ground. Contact I68 is then ineffective until the next quotation is to be transmitted. The circuit of the coil of relay I98, it will be observed, has just been completed through that one of the wipers I13 which has advanced one step into contact with its grounded segment I82. Meanwhile also the single wiper I14, as soon as it has advanced as much as onehalf step, causes the transfer bus I2I to be grounded through its grounded segment I82, thereby causing the transfer bus to be energized to effect a transfer of one group of storage relays from the operating key control to the transmitting apparatus, while transferring the other group of storage relays from the transmitter to the keyboard control in a manner as above explained. It will be observed that inasmuch as the wiper I14 continues'in contact with its segment I82 only during one-half revolution of the impulse counter, the transferring action will be reversed during the succeeding one-half revolution. That is, one complete cycle of operation of the impulse transmitting switches is .completed upon movement of the same through 180", but the wipers I13 having double arms, upon completion of one cycle are again ready to operate through another cycle utilizing the wiper arm which was inactive during the previous cycle.

Relay I9I upon being energized through its circuit above traced, closes the contacts I80, I01, I80 and I80, which serve to complete impulse circuits to line impulse relays I94, I00, I and I81, respectively, which circuits are each completed through contacts E98, I09, 200 and 20!, respectively, the latter contacts in turn being respectively under the control of digit cut-oi!" relays 202, 203, 204 and 200. At the same time relay iQI also prepares a holding circuit for the digit cut-off relays by closing a contact 208. The circuits through the line relays run from ground through contact I84, respectively through the contacts lat, itl, I08 and I 80, thence respectively through contacts W0, I00, 200 and 2G! to the line relays, thence to battery and ground in each case as shown. The holding circuit for the digit cut-oil relays runs from ground through contact 206, thence through contacts as at 201, one oi the latter being provided as shown for each of the digit cut-off relays, and thence through the respective digit cut-off relaysto battery and ground. 'lhese circuit changes are made successively upon the occurrence of each succeeding impulse as generated at the interrupter, I12, and the wipers ill and us continue to advance step-bystep. When one of the wipers ill reaches a. contact lot which has been grounded by the operation of the keyboard as above explained, then the corresponding digit cut-oi! relay is actuated and its corresponding holding circuit is established, thus preventing the sendingof further impulses over the corresponding line wire by reason of the opening of contacts I80, I99, 200 and 20!.

For example, supposing contact 9 of the hundreds bank has been grounded. Then immediately upon the arrival of the brush I13 upon contact 9, relay 2% picks up, opening the contact Q00 which prevents further impulses from going to the line relay Isfi. Also relay 204 at the some time closes its contact 201, which establishes its holding circuit from ground through contacts 206 and 20?, relay 204, to battery and ground 208.

Each of the relays 202, 203 and 205 operate in a similar manner when the other wipers I13 arrive at grounded contacts of the thousands,

tens and units impulse counter groups. The particular contact flBi of the thousands counter which represents zero, it will be noted, is permanently grounded, so that a total of ten impulses will be transmitted.

The relays use, 202, 203, 200 and 205 are of a slow acting type with copper slugs on the heel ends oi the cores, whereby these relays are made slow to release. The relay i9i may be delayed in opening for 0.1 second and the relays 202, 203, 204 and 2&5 are preferably delayed somewhat longer. These delays permit other circuits hereinaiter described to be established for transmitting indicator restoration and actuation impulses. As each of the digit cut-out relays 202, 203, 20 i and 205 picks up,'it closes a corresponding one of the series contacts 209, 2l0, 2H and H2. When all of these series contacts are closed, then the transmission of selector current variations over the four line wires is completed. Accordingly at that time the circuits are ready for the transmission ofimpulses for restoring the selected indicators to zero prior to reactuation. Thus when all of these four series switches are closed, a ground connection is made for the circult of a relay2l3, which circuit is continued to ground through a. battery 2 I4. The l'elay 2|;

is or the type which is slow to "pick up! as symbolically indicated and serves to interpose a delay between the transmission of selector impulses and the succeeding transmission oi restoration impulses, such delay being desirable by reason of the selector circuit arrangements at the receiving stations as described in my aioresaid Patent 1,800,876.

Transmission of indicator restoring impulses The relay ms after the short delay, closes contact 2 i 0, which establishes a circuit through relay i6I' as follows: ground, contact 2 it, coil oi relay liiI to battery and ground 2%. The relay IOI' corresponds in function to the relay l6i above described in connection with the selector transmission circuits. From this point the circuits for the transmission of indicator restoration impulses are analogous to the circuits above described for transmission for the selecting impulses, and the relays, contacts and parts which perform similar functions are therefore indicated on Fig. 6, with the some reference numerals, such reference numerals being accompanied by prime marks in the case oi the restoration impulse transmitting circuits. with receiving arrangements as described in my Patent l,ii9il,8i-o, provision is made for restoring the indicators to zero by applying to such indicators as have been selected a. sumcient numberof impulses, namely ten, to advance the indicators to either a blank or zero setting regardless of what their previous setting may be. Therefore, it is not necessary in the restoration impulse transmitting circuits to cut oil the number of impulses except after ten have been transmitted. Furthermore, the ten restoration impulses may be transmitted simultaneously over the four line wires so that but a single restoration impulse counter is required, common to all four lines, having ten steps or contact positions as indicated at lei". lihe construction of such impulse counter may be the same as that shown in Fig. l2, except that only one bank of contact points iBI' need be provided to operate in conjunction with a double wiper 813'. Furthermore, the transfer bus controlling wiper ll i of course need not be here provided, although for control purposes a wiper W0 is used in conjunction with an arcuate segment i832.

Since the ten restoration impulses are transmitted simultaneously over all four line wires, the four separate relays 202, 203, 204 and 205 may be replaced by a single relay 202", having a single set of contacts i190, 201' and 289, the functions of which are obvious iromrei'erence to the description of contacts 898, 207 and 209. The contacts i053, W1, W8 and 989' operating in conjunction with the relay lill' serve to bring the impulses from-contact E84 directly to the connections for the four line relays ltd, ltd, W0 and i191 respectively.

it will be observed that an interrupter 912' (see Fig. 7) independent of the interrupter 512 may be provided so that if desired the duration and spaclngoi the rector tion interruptions may be made different from that of the selector interruptions. This is desirable for the reason that in some instances it may be found advisable to operate the receiving station selecting devices at a step-by-step rate difierent from that of the indicating devices. However, inasmuch as the restoration and actuation impulses both act upon the receiving station indicators, the same interrupter I12 may be conveniently used for the transmission of restoration impulses, as well as the transmission of actuation impulses in a manner hereinafter described.

The function of the contact 209' is to cause a connection wire 2I8 to be grounded upon completion of the transmission of restoration impulses. At this time the circuits are ready for the transmission of the actuation impulses for moving the receiving station indicators to the desired new positions to exhibit a new quotation. The wire 2I6 has the same function in respect to the actuation impulse transmission as the starting wire I" has in connection with the selector impulse transmission. When the wire 2iv is grounded at contact 208' the relays and contacts of the restoration impulse transmitting circuits are brought to normal positions in readiness for the succeeding quotation transmission.

Transmission of indicator actuation impulses In a manner similar to the operation of the selector and restoration impulse transmitting cir-' cuits, the indicator actuating'lmpulse transmitting circuits shown on Fig. 7 are placed in operation by the energization of a relay 'IBi". From this point on the actuation impulse transmitting circuits continue through a cycle of operations in the same manner as the above describ d operation of the selector impulse transmitting circuits, and on Fig. 7 the actuation impulse transmitting relays and contacts bear reference numerals with double prime marks, the same numerals being used as on corresponding parts of the selector transmitter.

An actuation impulse counter is provided similar in practically all its details to the selector impulse counter except that of course the transfer bus control wiper I14 and its segment I82 are omitted. Also none of the zero contacts here is permanently grounded since zero actuation keys are provided instead. -After the last actuation impulse has been transmitted, the series contacts 209", 2H1", 2I I" and 2l2" are all closed whereby a circuit is completed through a contact 2Il to the transmission release magnet I21 above referred to. This causes relay I21 to pick up for a short time, thus opening the ground connection at I26 to the transmission release bus I20. After a short delay, a relay 2|! opens the contact 2 l7, whereby relay I2! is again deenergized. Referring to Fig. 5, it will be noted that the momentary removal of the ground at contact I26 from the transmission release bus I20 will cause the storage relays, then associated therewith, to be released in preparation for a new setting.

On the other hand, if the operator had made a mistake in pressing certain of the keys prior to the transfer action, then pressing of the error key would have actuated error release magnet H8, which would have momentarily removed the ground at contact H5, of error release bus "4. This would have released the storage relays associated therewith prior to transmission of impulses corresponding thereto.

The momentary removal of the ground at contact I26 from the transmission release bus I20, it will be noted, also causes deenergization of the key release magnet I4I, which in turn permits the key I34 which has been pressed, to rise back to normal position with a consequent deenergization of the starting relay I38, which in turn opens contact I40, causing the key release magnet circuit to remain open until another quotation is to be transmitted.

Referring again to Fig. 7, it will be observed that at the relay II2" I have provided an additional make contact 2", which becomes closed upon actuation of relay I42". That is, upon initiation of the transmission of actuation impulses, a circuit is then established from ground, through contact 2", through the coil of polarity reversing relay III, to battery and ground. Thereupon the relay Ill picks up" and actuates its contacts I and i", and also upon its contact I". It will be observed that contacts I54 and I5! comprise in effect a double pole, double throw switch which is associated with two of the polarity connections III in a manner whereby the polarity applied to line L2 is reversed upon actuation of relay Ill. 'lherei'ore, when the circuits above described are prepared for the initial transmission of actuation impulses after the completion of the transmission of restoration impulses, the polarity of line L3 is reversed so as to shift the receiving station apparatus from restoration conditions to actuation conditions. Inasmuch as relay I82" remains energized only for a short period, the contact I on relay I 53 is provided for establishing a holding circuit for relay I 53 by way of the transmission release bus I20, the latter being grounded at contact I28. Relay Ill therefore remains actuated throughout the period of transmission of actuation impulses, but upon removal of the ground from the transmission release bus, relay I53 drops to normal thus preparing the circuits to apply the proper line potentials for the next selecting step.

Receiver As hereinbefore stated, the transmitter and code translator may be employed with any suitable'type of receiver, for example, as disclosed in my aforesaid application Ser. No. 244,873, on which, among others, U. 8. Patents Nos. 1,890,876 and 1,890,877 have issued, and to which reference may be had for a more detailed disclosure of such a receiver. Figs. 14 to 16 diagrammatically illustrate the receiver.

The various potentials imposed on lines LI, L2, L2, L4 by the transmitter hereinbefore described energize selecting magnets 23., 23l, 232 and 222 (Fig. 15). Line LI is extended through the coils of magnets 23! and 2H and line L2 is extended through the coils of magnets 2II and 222. The operation of these two magnets is to effect selection of indicators within a group of indicators by connecting the various bus lines last", low",

high" and open", with main actuating lines' BI, B2, B3, B4. Line L3 is extended through the coil of magnet 232 which controls the selection and restoration and actuation husses for the indicators. Line L4 is extended through the coil of the magnet 233 and the coil of the magnet 220. The magnet 222 connects the various selecting switches and magnets to the grounded battery.

If, for example, the transmitter causes positive potentials to be set up in lines LI and L4 and negative potentials in L2 and L3, line L4 energizes the magnet 23! which through its switch 224 connects the switch system to the battery. The potentials on lines L2 and LI being of like sign, the magnet 232 will be energized and its switch member 228 will be drawn into position to complete a circuit from the battery through the restoration magnet 238 connecting all the restoration bus lines to the main bus lines for the last", low, high" and open indicators. The positive potential on line LI and the negative potential on line L2 will have no eflect on the magnet 22! and, accordingly, its spring switch 228 will remain in the position shown. The positive potential on line L! and the positive potential on line L4 will cause energization of the magnet 230 and closing of the open switch 239 and opening of the closed switch 240. This completes the circuit from the battery through switches 234, 238, 239 to "low" magnet 24!, which connects the main low bus wires to the main actuating wires Bi, B2, B3 and B4. The potentials imposed on these lines have therefore connected the restoration bus lines for the low" indicators to the .main actuating lines Bi, B2, B3, B4. The "last,

high and open" magnets 2E2, 243 and 245 are controlled respectlvelyloypotentials as shown in Fig. 7.

Selection of groups of indicators Referring to Fig. 14, the potentiai'on line L! will have energized magnet 2" which attracts its spring switch 2% to complete a circuit from a' battery through the coil of a slow-to-release magnet 2&1, and the spring switch 2&8 to ground. The polarity imposed on line L2 will'have energized magnet 2% in the hundreds selector which completes through its spring switch 249 a circuit from a battery through the coil or a slow-torelease magnet 256 to the ground. iSimiiar magnets in the tens selector and units selector will have been energized, but the description oi the selecting mechanism will be limited to the 00- operating thousands and hundreds selectors, which are the some respectively as the tens and units selectors.

When the selection impuise counters of Fig. 6 operate, the potentials over lines Ll, L2, L3, L4 are interrupted by the relays I96, I95, H88 and I91. Considering, first, the interruptions of potential in line Li the effect of an interruption is to deenergize the magnet 245 of Fig. 14 so as to complete a circuit from ground spring switch 246, spring switch 25!, spring switch 262 of magnet 241, through the coil of the slow-to-release magnet 253, and the coil of the vertical stepping magnet 256, to a battery and ground. As set forth in detail in my aforesaid patents, selector switches oi the well'lrnown Strowger" type are employed, in which a selector shaft in the thousands selector is raised one step for each energization of a vertical magnet, such as the magnet 254. As the shaft is raised it permits the switches 260 and 28! to close and remain closed as long as the shaft is in elevated position.

An interruption of the potential on line L2 deenergizes the magnet 268 in the hundreds seiector and establishes a circuit from ground through spring switch 289, spring switch 282, spring switch 268 of slow-to-release magnet 25B, coil 01' the slow-to-release magnet 26% and coil of the stepping magnet 265 to the battery and ground. The energization of the stepping magnet 265 operates a hundreds selector shaft 268, Fig. 16. This shaft carries a grounded switch arm 2659 which is moved over a series of contacts 210 as the shaft is rotated. The shaft also carries off neutral switches 21! and 2712 (Fig. 14) which are constructed to close and remain closed as long as the shaft 268 is out of home position. After the interruptions over lines L! and L2 have ceased, that is when the vertical adjustment of the selector shaft of the thousands selector and the angular adjustment of shaft 268 of the hundreds selector have been completed, the cessation of interruptions of potentials on line L! will cause the magnet 245 to remain energized, which will maintain the magnet 24'! energized and prevent further energization o! magnets 253 and 254 and cause the slow-to-release magnet 258 to deenergize. Energization oi the magnet 24! has drawn its switch member 213 to complete the circuit from the grounded battery, switch member 212, coil and shunt of magnet 214, switch member 2", switch member 2', switch 28! through the coil of a magnet 21'! to ground, thus preparing a circuit through the swimh member 218 oi the magnet Z'i'l.

The cessation of impulses on line L2 maintains the magnet 248 energized, which maintains the circuit over the magnet 250 and breaks the circuit "through the magnet 264, which closes a circuit at the point 219. As the magnet 283 in the thousands seiector deenergizes, it closes a circuit from the battery over the switch 213, switch rec, switch 218, through the coil of the horizontal stepping; magnet 28!, through the switch 21! in the hundreds selector, switch 219. and switch 282 ct magnet 253 to the ground. This energizes the horizonal magnet 28! which rotates the thousands selector shaft one step, and opens the switch 216 which breaks the circuit through the magnet 21? thus breaking the circuit through the magnet 28i When the circuit through the magnet 28! is broken theswitch 2118 again completes the cir-= cult through the magnet 21! which in turn compietes the circuit through magnet 28!.

When the selector shaft of the thousands selector is elevated by interruptions over line L! as previously described, the contacts 286 and 28'! are raised into alignment with a horizontal row oi contacts 288 and289. As the magnet 28E is energized and deenergized to rotate the shaft these contacts are moved along the selected row of contacts 288 and 289 and the energization and deenergization of the magnet 28! is continued until the contact 286 finds a live contact 288 which is grounded through one of the contacts 210 (Fig. 16) and the arm 269. when this occurs the circuit over the magnet 211' will be shunted and the magnet 214 will be energized to attract its switch 2'55 and prevent further energization of the magnet 2W. This in turn prevents completion of the circuit through the magnet 28! over the switch member 218. Energizatlon of the magnet 275 also moves the switch member 25! to connect the line B! through switch members 25! and 248 to ground. Energization of magnet 214 also attracts its switch member 29! which extends a circuit from battery over switch mem-' her 21", contacts 28'! and 289, selector line 292 to a panel board (Fig. 15).

One of the tens selector lines 293 has been connectedby mechanism similar to that in the thousands seiector through a switch 29% to ground. The selector line 292 at the point of intersection with the line 2%, is connected by one side of a double plug to a line 295 extending through the coil of a group selector magnet 295 and then over line 29F to the other side oi the plug to .the line 293 and to ground. This energizes the magnet 295 and selects a group of indicators corresponding to the adjustment of the selectors in Fig. 14 under the control of the selection impulses received from the transmitter. Each of the indicator elements or the indicator units of the groups of indicators is diagrammatically indicated at 289.

When the circuit was made at 219 in the hundreds selector, the magnet 298 in the selector was energized by a circuit from ground, battery, coil of the magnet 288 over switch 2li, switch 219, ll

Images