US2275609A - Apparatus for verifying statistical data - Google Patents

Description

March 10, 1942. J. w. BRYCE.

APPARATUS FOR VERIFYING STATISTICAL DATA Filed July 25, 1959 9 sheets-sheep 1 ATTORNEY March 10, 1 942.

J. W. BRYCE APPARATUS FOR VERIFYING STAT'J ISTICAL DATA 9 Sheets-Sheet 3 Filed July 25, 1938 w w will/5'5 i INVENTOR Ill...

ATTORNEY March 10, 1942. J, w BRYCE 2,275,609 APPAR\ATUS FOR VERIFYING STATISTICAL DATA 9 Sheets-Sheet 4 Filed July 25, 1939,

" INVENTOR March 10, 1942. J. w. BRYCE 2,275,609

APPARATUS FOR VERIFYING STATISTICAL DATA Filed July 25, 1939 9 Sheets-Sheet s INVENTOR March 10, 1942. J BRYCE 2,275,609

APPARATUS, FOR VERIFYING STATISTICAL DATA Filed Ju ly 25, 1939 9 Sheets-Sheet 6 7 CL. MAKES Q TEQLE- INVENTOR AT'TORNEY J. w. BRYCE APPARATUS FOR VERIFYING STATISTICAL DAT-A March 10, 1942.

Filed July 25, 1939' 9 Sheets-Sheet '7 INVENTOR ATTORNEY March 10,1942. J.-w.- BRYCE 2,275,609

APPARATUS *FORVERIFYILNG STATISTICAL DATA Filed July 25, 1939 9 Sheets-Sheet 8 4 (/n/H/ Un/'7"2 (/n/fs Tens miowmm4\'mm Un/fs Tens -'-r AT'DI'ORNEY Mal-ch10, 1942.' J. w. BRYCE 2,275,609

APPARATUS FOR VERIFYING STATISTICAL DATA Filed July 25, 1939 9 Sheets-Sheet 9 I i1. -..'.L4=-c. w TE Eva 1" 2 11 I u u 5 -Ra lNVENT R v i ATTORNEY Patented Mar. 10, 1942 James W. Bryce, Glen Ridge, N. 1., assignor to International Business Machines Corporation, Blew York, N. Y., a corporation oi New York Application July 25, 1939, Serial No. 286,442

5 Claims.

This invention pertains broadly-to statistical systems and relates more particularly to improvements in machines for verifying statistical data formed on records which data is represented by magnetic recordings.

It is now suggested to provide the control records with magnetic impressions for representing the data, which impressions are formed by subjecting the records to magnetic fields of varying intensities. Due to the characteristics of the records, which are formed from suitable magnetizable materials, the magnetic impressions formed thereon can be retained for any desired period and utilized for controlling the statistical operations of the machines.

In the present application disclosure is made of records adapted for controlling the statistical operations of machines in accordance with the magnetic impressions on the records, which'impressions are not differentially located on the records inv various index point positions ,but instead are formed magnetically by being subjected to magnetic fields, the lines of force of which are varied at different frequency rates; thus, the impressions retained therein are formed in different frequency ranges for representing the different data. The magnetic impressions are similarly positioned on the records with respect to each other so that in the statistical'systems differentiation of the data designations is not made by the disposition thereof at different positions on g the record.

In order to illustrate and describe the invention briefly, provision is made whereby recordings of the impressions in different frequencies are designated to represent the different data values. For example, a magnetic recordingin a frequency of the order of "fl" may represent the numerical data one," a recording in frequency "12 represents the number two, etc.

Provision must be made in such systems employing the type of records just referred to whereby verification of the data recorded upon the records can be made. The subject matter of the instant application relates solely to a machine for verifying the data on the records which is in the form of magnetic recordings of different frequency values.

Accordingly an object of the present invention resides in the provision of means whereby data represented by the sensed magnetic recordings is compared with preselected data to 'determine whether or not the compared data is in con-- formity.

be set forth later provision is made whereby the different frequency values ofv the recordings are sensed to select individual control circuits which are representative of the sensed data. A plurality of these control circuits are provided for each cordance with the preselected or comparing data;

To accomplish this object and other objects-to 55 that is, a plurality of operable keys are provided for setting up the selected verifying'data to which the sensed data should conform. The selected keys are effective to open those said control circuits which represent the selected data and inthe event the selected and sensed data. are not in agreement these control circuits are effective to control a non-verifying control mechanism.

In such cases where the compared data is in' disagreement provision is made to transfer the said setting of selected data to data storage units for purposes to be set forth. The non-verifying control mechanism upon operation calls into action control means for wiping out the erroneous magnetic recordings and then during the following cycle automatically effects recording of the correct data on the record where the previous erroneous recording was formed.

It will be seen that while one record is being verified, operations are being effected to wipe out the erroneous recordings on the preceding record, and effecting correct recording on a record sensed two cycles earlier. For this reason, a plurality of data storage units are provided. Transfer of the correct data is made in one of the units while the erroneous data is erased,-and recording is effected upon a record at the same time in accordance with the data stored in another one of the said units.

Therefore, another object of the present invention resides in the provision of means for automatically sensing the recorded data, checking it with preselected data and erasing the said data a cycle later whenever the said data is in'error.

Another object of the invention is the provision of means for automatically recording the correct data upon the records after the erroneous data has been deleted.

Another object is the provision of means for effecting-the sensing operations, the verifying for verifying the data recordings and automati cally transferring the verifying data to storage data recording operations.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In the drawings:

Fig. 1 is a detail view of a fragmentary section of a control record.

Fig. 2 is a section showing the record feeding means and record sensing, erasing, and recording means.

Fig. 3 is a detail of the control clutch of the feeding means.

Fig. 4 is a section of the data verifying keyboard section.

Fig. 5 is a detail of the start key and reset means of the keyboard section shown in .Fig, 4.

Fig. 6 is a section of a data storageunit.

, means which is then later effective to control the Fig. '1 15a detail of the keybar reset means of the unit shown in Fig. 6.

Fig. 8 is a plan view of a tuned reed relay unit. Fig. 9 is a front elevation of the relay unit shown in Fig. 8.

Fig. 10 is a section along the lines Iii-l0 of Fig. 8.

Fig. 11 is a detail' of the unit shown in Fig. 10.

Fig, 12 is a diagrammatic view of the error indicating lampbank.

Fig. 13 is a timing chart of certain control ele- .ments of the machine.

Figs. 14a, 14b, and 140' when taken together in the order named form a wiring diagram of the machine showing the circuit connections of the control elements.

Control records 20 which is similar to the well known type of record cards adapted for use in the Hollerith statistical system. The record card may comprise 1118s in the individual fields are formed in individual frequencies II to Is to extend vertically across the zone to represent the difl'erent numerical values. The different data designations are indicated generally in.the figure by the representations II to fill which allude to the frequencies of the recordings or impressions formed in the related columns. The number represented in zone 1 by the magnetic recordings indicated is 39521, in zone 2 the number represented is 67890, and in zone 3 the number is 12345, thus it is seen that a record card is provided with three individual records or groups of recordings.

' Record feeding and recording means Referring now to Fig. 2 the record card feeding means shown is similar to well known types of card feeding mechanisms.- For this reason the abbreviated disclosure and description is believed sufilcient. For detailed structural disclosure reference may be made to U. 8. Patents Nos. 1,741,985 and 1,741,992. The record cards 20, disposed in the magazine 2!, are fed singly from the stack by the card picker 2la to be advanced successively to suitably disposed pairs of feed rolls 22,-23, and 24 respectively and thence to a sheet of suitable non-magnetic material, such as paper, which is impregnated with granular magnetic material such as iron filings; or, if preferred the record card can be made by depositing finely divided metal powder in the paper pulp so as to be incorporated therein before the manufacture of the magnetizable paper stock. Another type of record card which can be used is one which comprises a multi-ply card having a-wafer or foil of magnetic material formed between two layers or plies of suitable paper stock.

The record card shown in the instant application is a three zone record so that the data designations can be formed in any of the zones desired. The individual zones are indicated in Fig. 1. Each zone is sub-divided into individual fields or columns which are designated by the reference characters a, b, c, etc, It is noted that the said fields or columns extend vertically across the entire zone. During recording operations the magnetic fields are directed to the desired fields to subject these portions of the zones to the varying lines of force initiated by the recording magnets. The different magnetic impressions or 're-' cordings formed on the records are then retained in the particular fields designated in Fig. 1..- In order to represent different data the recordings are formed in different frequencies, for example, for the numerical data 1 to 9'? the record the discharge hopper 25. The card picker is actuated by the reciprocating arm 28 which is positioned by the disk 27 (secured to shaft 28) by means of the connecting link 29, one end of which is eccentrically mounted on the disk. The shaft 28 is driven by the main shaft 30 by means of worm gearing secured to both the said shafts and indicated generally by the reference character 3!. The said pairs of feed rolls 22, 23 and 24 are also rotated by the main shaft 30 by means of the individual worm gears 32 secured to the individual feed rolls and individual worm drives 33 secured to shaft 30. In thismanner the-cards are advanced from the magazine past the sensing magnets 10, wipe-out magnet 34 and recording magnets 35 at a constant rate of speed and in the order named. It is seen as the cards are fed from the magazine to the feed rolls they first pass under the individual sensing or reading magnets 10. A single reading magnet is provided for each column on the record to be sensed so that whenever the records are passed under the reading magnets the magnetic recordings are effective to influence the said magnets in accordance with the frequencies of the recordings. Next, the cards are advanced past the wipe-out magnet 34 (which is sufficient in length to extend along the full length of the card). The said wipe-out magnet isprovided for the purpose of conditioning the card for recording purposes and for erasing or neutralizing any previous unwanted recording on the record cards. As the cards are advanced they are fed past the recording station whereat the recording magnets 35 are disposed, one magnet for each columnar position to be recorded. It should be noted that Just beforethe cards pass under the reading magnets they are effective to actuate the card le-' ver 36 and cause the contacts 31 to be closed.- It should be stated that the spacings of the said magnets is equivalent to one zone of the described records.

Means for driving the main shaft 30 is shown in the form of the drive belt 38 and pulley 39 for each order of keys is provided). I

thereto an individual control or zero bar 53 is drive pulley 39. A pawl member 4| .pivotally mounted on the drive plate 42 (which plate is secured to shaft is held'out of engagement with the disk 40 by means of the latch lever 43 which is shown as an integral part of the armature of control magnet 44. Upon energization of the said magnet the latch lever is displaced to release the pawl and drive plate thus permitting the pawl and drive disk to be engaged and rotated by the drive pulley therebyrotating' the initiated by the manual operation of a motor main shaft to which the drive plate is secured.

Contacts 45 are arranged and suitably disposed so that they are closed by the pawl member I when in the position shown in Fig. 3, and opened when the pawl and drive disk are engaged.

It should be stated that a group of cam controlled contacts CCI to'CCI are providedlsee wiring diagram) one of which is shown suitably positioned so that the operation thereof is controlled by the associated cam 46 which is secured to shaft 41 and rotated by shaft Ilby means'of the gearing generally designated ll.

. Keyboard section Referring now to Figs. 4 and 5 the data verifying keyboard section which is a well known type and illustrated in U. 8. Patent No. 2,147,626 will be described briefly. dataverifying keyboard is to provide means for storing or setting up selectively by means of the manually operated keys the data which isto be compared with the recordings formed on the records. The keyboard is of the typical 81 lgey type having nine keys in each denominational order. The keyboard need not be limited to nine orders of keys but is provided with as many orders as there are columnar positions on the record cards. Provision is made (as is usual in the 81 key type) whereby upon depression of the individual keys 50 against the action of the associated springs 5| they are held latched in the depressed positions by the related latch bars 52 (of which one In addition provided for each order of keys so that upon depression of any key in the selected denominational order the related bar 53 is cammed to the right as viewed in Fig. 4 by suitable camming edges provided on the key shanks to open the associated contacts 54. For each zero bar an auxiliary positionable control lever 55 is provided for the purpose of opening the related zero contacts 54 and closing the'c'ontacts "H in the order or column desired, the reason for which will be understood as the description progresses. Each keybar is provided with a V-shaped conducting portion itadapted to engage, upon depression of the associated key, the related contact strip 51. In this manner-the contact strip 51 is connected to a common bus bar I3 by means of the conducting portion 56. Provision can be made in the machine to mount the corresponding digital contact strips 51 to a common bus bar 18. Each keybar is also provided with a second V conducting portion 14 which normally con- The purpose of the.

bar 58, the depression of which causes the contacts S8 to be closed. By means of a latch lever the depressed bar is maintained so, due to the engagement of the stem 6| .of the bar with the said latch lever, upon completion of the verifying cycle means are provided, such as solenoid II, to be energized to restore the motor bar to its normal position. It is seen that energization of the solenoid causes pivoted latch member 80 to be partially rotated in a clockwise direction upon displacement of the solenoid-plunger by means of the link 88 thereby releasing the-latched stem 8| of the motor bar.

During the said rotation of latch member 60 p and after the release of the motor bar the link 64 causes lever 65 to be partially rotated and in turn to rotate the shaft 68 in a counterclockwise direction. Rotation of shaft 88 effects displacement of the arm 81 (secured to said shaft) and transverse bail 68, which bail, upon being rocked,

thrusts the latch bars 52 forwardly (to the left as viewed in Fig. 4) releasing any depressed keys which have been latched down. Also during the latter movement of latch member .60

' the associated contacts 69 are closed for purposes ing manually depressed. The purpose of this unit of which'there are two will be understood when the circuit diagram isdescribed, therefore, for the present it will suillce to state that the unit shown in the said figures comprises a data storing unit for purposes of substituting correct recordings on the records when it is determined during comparing operations that the data previously recorded on the records is inerror.

The keybars We are adapted to be depressed upon energization of the related solenoids, the plungers 80 of which are suitably secured or linked to the said keybars. Upon depression thereof therelated latch bars 52a are effective to hold them depressed causing the V conducting portions 56a to engage the individual conducting strips 86 which connection will be referred to as contacts D in the wiring diagram. Thepositioned keybars are also effective to open the associated zero contacts 8i whenever one of the keybars of each order is depressed. Thezero bars 53:: are also effective in this unit to engage contacts 82 by means of the cooperating arms 88.

nects the conducting strip .15 to the common bus to as contacts'A and B, the former representing the make contacts and the latter the break contacts. In addition thereto each keybar is pro.

.An additional set of zero contacts 83 are provided for each column or order of key-bars and can be open or closed as desired by positioning the related lever 89 which is provided with a conducting segment adapted to bridge the contacts 83 when in'the position shown in Fig. 6. V

The purpose of these additional zero contacts are for suppressing the recording of zeros in undesired columns. g.

The depressed keybars are released whenever bar 52a to release all the depressed keys similarly as described above. Upon energization of the said solenoid and the lowering of the link 631a suitably disposed contacts 85 are opened, and contacts 84 are closed due to the rotation of latch member 60a.'

Tuned reed relays Referring'now to Figs. 8 to 11, the tuned reed relays will be explained briefly, if desired, a more detailed description will be found in U. 8. Patent No. 2,113,617. Aplurality of vibratory reeds II! definite period of vibration.

When electrical impulses or oscillations of different frequencies are impressed upon the main coil II8 which surrounds one of the sides of the yoke the reeds tuned to such frequencies are vibrated. A biasing coil H9 is provided to sur round the .reeds, which coil is constantly energized by a low frequency current for normally holding the reeds in vertical positions so that the free ends thereof are held steady and substantially in the center of the air gap in the yoke.

Individual contact arms I20 are provided for each reed and are arranged so as to be supported by the free ends of the reeds as shown so that the related contacts I 2| are normally held open and contacts I34 are normally closed. Upon energization of the main coil H8 and upon vibration of the selected reeds 5, the related contact arms I drop from the free ends of the reeds thereby causing the said associated contacts I2I to be closed and contacts I34 to be opened.

Reset means are provided to restore the contact arms from. the said displaced positions to the normal positions, resting upon the free ends of the associated reeds as shown, and generally comprises a reset magnet I which upon energization causes arm I26 to be partially rotated in a clockwise direction. This action is retarded slightly by the dash pot I21 and associated linkages provided to cooperate with the arm I26. As the said arm approaches its limit of travel in a clockwise direction, the stud I20 which is formed on the arm cams pawl I29 out of a latched position to release the spring urged arm I30. The released arm I30, by means of link I3I,

causes the arm I32 of a U-shaped bracket I33- to be raised to lift bymeans of the bracket, the displaced contact arms I20 sufliciently to permit the reeds to be restored to a supporting position for the related arms.

Error indicating means Referring now to Fig. 12, an error indicating device is shown to comprise a series of lamps 05 with indicating data formed thereon such as the numerical data 0 to 9. ing lamps can be disposed beneath translucent figured stencils so as to indicate the selected numbers or data when the lamps are energized. The number of columns of lamps provided is determined by the number of columns-\of recordings provided on the record cards. In each column, eleven lamps are provided, ten for representing the numerical datauand the eleventh to indicate that no recording has been made on the card, the

If desired the indicate latter are indicated by the reference character "a.

Operation of machine It is necessary to condition certain of the control circuits when starting the verifying machine before the actual verifying control circuits are called into action, for example, it is desired upon initial operation of the machine to clear the settings of the various keyboard sections of the machine and to restore the tuned relay con-- tacts a normal condition. These circuits are as follows: Upon closure of the main switch SI the machine motor 49 is connected to the power supply conductors I40 and I and the biasing coils IIS of the tuned reed relays are energized 'constantlyby the low frequency current generated by a suitablefrequency generator I42. A circuit is completed from conductor I40 to contacts 45 (see Fig. 3), contacts Ric, Bid to solenoid 02 and conductor HI and also from contacts RM to contacts RI], normally closed contacts CO0 to solenoid 62a of unit #2 and conductor I4I, energizing the said release solenoids associated with the data verifying unit. keyboard section and keyboard section of data storing unit #2 to eflectthe releasing of any depressed keybars of the said secti0ns.-

Energization of solenoid 82 causes the contacts 68 to be closed (see Fig. 5) to complete a circuit from conductor I40 to relay R1 and conductor I4I energizing said relay. .A holding circuit is Closure of contacts RIc connects the reset solenoids I25 of the tuned reed relays to the power supply conductors to energize these solenoids and effect restoration of the tuned reed relay contact IN to the normal positions shown in Fig. 9. Closure of contacts 84 of unit #2 (due to energization of the associated solenoid 62a, see Fig. 7) completes a circuit from conductor I40 through the said contacts to relay R8 and conductor I4I energizing said relay. A holding circuit is then established from conductor I40 through contacts C06, RM to relay R8 and conductor MI. The operation of the remaining contacts of relays R1 and R8 have no effect on the control circuits at this time and need not be referred to. The restoration of the storing unit #I is effected 'at a later time and will be explained as the description progresses.

Assuming now that the record cards which are to be verified are properly placed in the card magazine when the starting key (motorbar 5B) is depressed and latched to close the associated contacts 59. Control circuits are now established as follows to effect feeding of the first zone of the first card up to the sensing magnets I0. A circuit is then completed from conductor I40 through.the said contacts 59, contacts RIb and R4b to the control magnet 44 and conductor I4I energizing said magnet and causing the card feeding mechanism to function and feed the first card from the magazine to the first pair of feed' feed cycle, contacts C04 are closed completing a circuit from conductor I40 through the said contacts CC4, contacts R and relay R4 to conductor I4I energizing said relay. A holding circuit is then established from conductor I40 to contacts 55, contacts R4a and relay R4 to conductor I4I. Opening of contacts R4b causes the clutch magnet 44 to be deenergized so that the card feed mechanism is latched up at the 180 point of the cycle. At approximately the 170 point of the cycle the card lever controlled contacts 31 are closed to effect energization of relay R5. Upon operation of contacts Rio and Rib the control circuit for relay R4 is transferred from contacts 004 to CC5. when the card feed mechanism latches up the contacts 45 are closed to again energize the solenoids 52 and 62a as described before, causing the relays R1 and R8 to be energized (the detailed circuits were traced hereinabove) The record card is now positioned so that upon v operation of the start key again the verifying operations will be effected due to the passage of the first zone of the first card under the sensing magnets. Assume that the verifying or comparing data is set up and stored in the verifying.

keyboard section, comprising the keys 50 so that the associated contacts A and C are closed and contacts B are opened, when the start key or motor bar 58 is depressed to close contacts 50 and energize the clutch magnet 44 thus causing the card feeding mechanism to function and effect advancement of the first zone of the first card past the sensing magnets I0.

As the magnetic recordings in the first zone of the card are sensed by the corresponding sensing magnets III, the varying E. M. E's impressed the verifying keyboard section and the data represented by the operated contacts I2I and I34 of of said contacts 45 also at this time is effective to cause energization of the release solenoid 02a of unit #I since cam contacts C08 are transferred at the 270 point of the cycle (see Fig. 13). This circiuit is as follows: conductor I40, contacts 45, contacts Ric, Rid, RI], transferred contacts CO8 and solenoid 02a of unit #I to conductor I4I energizing the said solenoid. In this manner the associated keyboard section is cleared of any previous setting;

Upon disagreement of the said data circuits would be completed through the coils of the said scribed at the 270 point in the cycle due to 010- sure of the said contacts C05. Holding coils whichare indicated URh' and TRh are provided for the relays UR and TR so that upon energization of the UR and/or TR relays and closure of the corresponding contacts URIa to URIIa and/or TRIa' to TRI Ia the corresponding holding coils are energized, for example, one such circuit can be traced as follows: conductor I40 to contacts CO2, contacts I of a release key RK, contacts URIa, holding coil URhI of relay URI, as-,

sociated lamp 05 to conductor I4I energizing said coil and lamp. Another circuit which is completed at this time extends from conductor I40, contacts CC! and I48 to contacts RIa and holding coil Rhl of relay RI to conductor I4I. Openingof contacts RIb prevents further energization of clutch magnet 44 at this time.

From the data indicated by the lam-pbank section, it can be determined which group of data of the said compared data is in error, and assume now that the data in the zone on the record just the tuned reed relays should correspond and be in agreement. If the data sensed by the sensing magnets and the data set up-in the keyboard section agree no circuits can be completed to any of the coils of relays URI to URI I, TRI to TRII and relay RI upon closure of the cam controlled contacts CCI (which occurs approximately at the 260 point of the cycle). In the event the compared data agrees closure of the contacts CO5 at approximately the 250 point in the cycle completes a circuit from conductor I40 through the said contacts RBb to relay R4 and conductor I4I energizing said relay and effecting deenergization of the clutch magnet 44 (due to opening of the contacts R4b which was described in detail before) thus causing the card feed mechanism to be latched up at the 270 point of the cycle. Closure of contacts 45 causes the data set up to be wiped out of the cerifying keyboard section, as described in detail before, and conditioning the circuits for another verifying operation upon setting up the new data on the keyboard section and upon depression of the start key 58. Closure verified is found to be in error. For such conditions the correction key CK is depressed to establish a circuit from conductor I40 to contacts 45, 1

contacts RId, R811, contacts I41 and transferred CCB contacts to solenoid 62a of unit #I energizing said solenoid and clearing the keyboard section of any previous setting. The associated contacts 84 are closed upon energization of the said release solenoid to complete a circuit to relay R8 energizing this relay and establishinga holding circuit therefor through contacts CC6 and R811.

Opening of contacts R8d causes the release solenoid 82a of unit #I to be deenergized permitting the associated contacts 85 to be closed. Now a circuit is completed from conductor I40 'to contacts 85 of both units #I and #2, contacts R8e, closed contacts C of the verifying keyboard corresponding to the data set up therein, corresponding solenoids I0 of storing unit #i, transferred CO3 contacts to conductor I, thus energizing the said solenoids to set up the data in the recording storing unit #I which data corresponds to the data originally set up in the verifying keyboard section.

It will now be necessary to clear the setting of the verifying keyboard so that a new setup can be made for further data comparing and verifying operations. It will be seen presently that during the verifying operations of the data on following zones of the records that the data of the previous zone verified and found to be in error will be erased from the record and a correct recording of the data will be formed on the record.

Upon operationof any keybar of the recording unit #I the common contacts 82 thereof are closed to complete a circuit from conductor I40 to .the series of contacts 45, RI d, R80, 82, CO1

tranferred (see Fig. 13) R40 to solenoid 32, of the.

verifying keyboard to conductor I thus energizing the solenoidand clearing the keyboard of its previous setting. Contacts 69 now close to cause the relay 'R'I'to be energized and establish a holding circuit therefor through contacts 003 and RM as described hereinabove."

The machine is now conditioned for another verifying operation whereby the data set up in recordings are formed on the card, that is, the

the verifying keyboard is compared with the data sensed on the second zone of the first card.- During this verifying cycle the erroneous recording on therecord is erased so that duringthe following cycle the correct data which is stored in recording unit #I is then recorded upon the first zone of the record.

' After setting up the newcomparing data in the verifying keyboard section (by depression of the keys 50) the start key or motor bar 58 is depressed and also a second key I50 (Fig. 140) to close contacts 59, I 5i and Illtrespectively. Closure of contacts 59 and iii completes a circuit to the clutch magnet 44 to cause the card feeding mechanism to function. C1osure of contacts I52 completes a circuit to the wipe out magnet 34 and relay R5. At the beginning of each cycle contacts'CCG are opened thus effecting deenergization of relays R1 or R3. In view of this a holding circuit is then established for relay R5 and magnet 34 which is as follows: conductor I40, contacts RIb, Rib, R541. to relay R5 and wipe out magnet 34 to conductor I. At the beginning of this said cycle. relay RI is also deenergized due to the opening of contacts CC! which break the holding circuit established through theholding coil Rhl for this relay. Now the circuits are condi-tioned again so that in the. eventthe compared data disagrees the described control circuits for this condition can again be established. It is seen now that as zone I of the card passes under the 'wipe out magnet 34 the recording therein is erased due to the neutralizing action of the said magnet and concurrently therewith zone 2, of the card is sensed by the reading magnets 10 so that the sensed data can be compared with the data setup in the verifying keyboard as described.

Now,*during the following cycle when zone f the card is sensed by the reading magnets 10 to the correct data stored in the recording unit #1] is recorded in zone I of the record. It was mentioned hereinabove that two data storing units #I and #2 were provided for recording purposes. The reason for two storing devices now is evident for in the event two succeeding zones on the records were in error, it would be necessary to transfer the data from the verifying keyboard to these'units successively. Thus, provision is made that while one unit is used during the recording operations on one zone, the data from the verifying keyboard can be transferred to the second data storing unit which then subsequently controls the recording operations. The operation of cam controlled contacts CO3 controls the selection of the recording storing units, and also controls the energization of relays R2 and R3, the contacts of which control the connections of the contacts of the recording units to the fre-- quency generators I55 and the recording magnets'35.

To continue with the chosen example, the

erasing of the magnetic recordings in'zone I of the record card occurred during that portion of recordings are made in frequency values corresponding to the closed contacts D of the recording storing unit #I which represent the correct data. q The frequency generators per se do not form the subject matter of the instant application, and since they are well known in the art they need 'not be described in detail. The well known type of electronic oscillation generator is shown, however, it is obvious that any type of oscillation source may be used such as the rotary type of frequency generator. However, it should be ,stated that each generator I5! is adjusted to generate oscillations of different frequencies and such indications are made by the references I I,

J2, etc.' It was assumed hereinabove that the numerical data "one is represented by a recording in frequency ,f I, two in frequency 12, etc. For this reason, the corresponding frequency generators are connected to the corresponding contacts D of the storing units #I and #2 so that, for example, closure of the "5" contacts of the storing unit is eflective to connect the frequency generator f5 to the recordingmagnets to effect recording of this frequency on the record to represent the data 5." The magnetic recording principle per se is old and well known and requires no further description at this time other than to state that whenever the oscillations Y are impressed upon the recording magnets the magnetic fields set up thereby are varied at a rate in accordance with frequencies of the oscillations and that consequently the magnetic reiiordings effected onthe recor'dsand retained thereby are formed in corresponding frequency values. 1

It is believed that since the control circuits for each individual operation have been traced in detail that further cycles of operations need not be set forth or repeated since the subsequent operations will be one of the types Just described and effected in the manner set forth.

It should be mentioned that provision is also made. to detect and indicate unrecorded records which are fed to the machine. Due to the nature of the magnetic recordings visual detection of recorded records is not possible, therefore, the following circuit is provided to detect this condition. Obviously, when a blank record is fed past the sensing magnets 10 the associated tuned reed relays are unaffected and remain inoperative.

Due to this fact none of the associated contacts I2I of the said relays are closed and likewise none of the contacts I34 are opened. Thus, when the cam controlled contacts CCI are closed a circuit is completed from conductor I40 to contacts CCI to one of the contacts A which are closed to represent a data setting (or if a zero is set up is completed through contacts 54) the series of contacts I 34 to relay URII and/or TRII and relay RI to conductor I. As mentioned hereinabove the associated'holding coils of these relays; namely, RhI, URhIl and/or 'I'RhII are as'raoos energized to maintain the said relays energized. The condition described is indicated on the error indicating board by the energization of the lamp or lamps 95a. i

While there has been shown and described and pointed'out the fundamental novel features of the invention as applied to a single modification y it will be understood that'various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without de-- parting from the spirit of the invention. It is the intention, therefore, to be limited only as invalues of the sensed recordings, individual groups of control circuits, one group for each column of data sensed, means controlled by the initiated oscillations for selecting predetermined circuits from the said groups in accordance with the frequencies of the oscillations, settable mechanism having means for setting up therein predetermined data with which the sensed data should conform, means controlled by the settable mechanism for controlling the energization of the said selected circuits, including means for preventing energization of the said circuits when the sensed and set" up data is in agreement, and indicating means rendered operative by the energized selected circuits whenever the compared data is in disagreement.

2. In a machine of the character described for verifying statistical data on records, which records have individual columns of magnetic recordings indifferent frequency values to represent the different data, individual sensing magnets for sensing the said recordings in different columns, means controlled thereby for initiating oscillations of diflerent frequencies in accordance with the frequency values of the sensed magnetic recordings, control means having means selectively controlled by the initiated oscillations in accordance with the frequency values thereof, settable means having means for setting up predetermined data with which the sensed data should conform, indicating means and means controlled jointly by the said control and settable'means whenever the sensed data and said set up data disagree for rendering the said indicating means operative.

3.1:: a machine of the character described for verifying statistical data on records, which records have individual columns of magnetic recordings in different frequency values to represent the different data, individual sensing magnets for sensing the said recordings in different columns, means controlled thereby for initiating oscillations of different frequencies in accordance with the frequency values of the sensed magnetic recordings, control means having means selectively controlled by the initiated oscillations in accordance with the frequency values thereof for representing the sensed data, means for verifying the data represented by the said control means to determine if the sensed data is erroneous. and means for indicating whether or not the sensed data is in error. i

4. A machine of the character described for verifying statistical data on records comprising data sensing, obliterating and recording means, means for feeding individual records progressively past the said sensing, obliterating, and recording means, means controlled by the sensing means for representing the data sensed on the records, means for verifying the accuracy of the said represented data, means controlled by the verifying means when the data is in error for controlling the, obliterating means to obliterate the erroneous data, means for rendering the recording means effective to record the correct data in the columns where the erroneous data appeared on the records, and means for rendering the sensing means and obliterating means effec- 'tive to sense the data and obliterate theerroneous data on successive records at the times the said recording means is effective to record the said correct data on the preceding records.

5. A machine of the character described controlled by statistical data on records comprising data sensing, obliterating and recording means, means for feeding individual records progressively past the said sensing, obliterating, and recording means, means for rendering the sensing means effective to sense the data, means for conpeared, respectively.

trolling the obliterating means to obliterate desired data appearing on the records, means for controlling the recording means to record different data in the columns wherethe original sensed data appeared on the records, and means under control of the sensing means upon sensing predetermined data on a record for rendering the said obliterating and recording means effective successively to obliterate the sensed data on the said record, and record different data in the columns where the original sensed data ap- JAMES W. BRYCE.

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