US1125699A

US1125699A - Electrical recorder.

Info

Publication number: US1125699A
Application number: US73285712A
Authority: US
Inventors: Morris E Leeds
Original assignee: Individual
Current assignee: Individual
Priority date: 1912-11-22
Filing date: 1912-11-22
Publication date: 1915-01-19
Anticipated expiration: 1932-01-19

Description

M. E. LEEDS.

ELECTRICAL RECORDER.

APPLICATION FILED NOV. 22, 1912.

Patented J an. 19, 1915.

6 SHEETS-SHEET 1.

ATTORNEY INVENTOR WITNESSES M. E. LEEDS.

ELECTRICAL RECORDER.

APPLICATION FILED NOV,.22,1912.

1, 125,699. Patented Jan. 19, 1915.

6 SHEETS-SHEET 2.

M 6. DZILLENTOR N BY b A TTORNE Y M. E. LEEDS.

ELECTRICAL RECORDER.

APPLICATION FILED NOV. 22, 1912.

1,125,699, Patented Jan.19,1915.

6 SHEBTSSHEET 3.

- BY fli aa/ A TTORNE Y Mt /c325,;

M. E. LEEDS.

ELECTRICAL RECORDER.

APPLICATION FILED NOV. 22, 1912 1,125,699, Patented Ja11.19, 1915 6 SHEETS-SHEET 4.

3 fig V, I A

I s FS 64 63 63 Za INVENTOR K5, ATTORNEY M. E. LEEDS.

ELECTRICAL RECORDER.

APPLICATION FILED NOV. 22, 1912.

1,125,699. Patented Jah.19, 1915.

5 SHEETS-SHEET 6.

z lil lm. BY

7km ATTORNEY MORRIS E. LEEDS, OF PHILADELPHIA, PENNSYLVANIA.

ELECTRICAL RECORDER.

Specification of Letters Patent.

Patented Jan. 19, 1915.

Application filed November 22, 1912. Serial No. 732,857.

To all whom it m'ay concern.

Be it known that I, Monms E. LEEDS, a citizen of the United States, residing in the city of -Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain new and useful Improvements in Electrical Recorders, of which the following is a specification.

My invention relates to a system of and apparatus for recording electrical, chemical, mechanical, physical or other quantities.

My invention resides in a system of an ap-.

paratus for making a record of such magnitudes or quantities as they change or vary with time, the magnitudes or quantities being preferably represented electrically, and the corresponding electrical variations or changes being employed to control my recording apparatus, though it is to be understood that my system and'apparatus is of general application as well. The changes or variations of the magnitudes or quantities to be recorded are responded to by a relatively limited movement of a member, such as an indicator or pointer, which is free to move most of the time and is periodically engaged by another member for the purpose of actuating or controlling the recording ap= paratus.

My invention resides in such a system, but more particularly in such a system wherein the movable member, as the indicator, needle or pointer, controls the provision or closure of a path from which mechanical energy may be transmitted to exercise any suitable control or to actuate any suitable magnetism. In these respects my invention is similar to the system and apparatus disclosed in my prior Patent No. 96582-1, July 26, 1910. But my present invention resides in improvements upon my aforesaid patented system or apparatus and in other features relating to the production of a mpltiple record, that is, a record of a plurality of quantities or magnitudes as they vary and change with time; and my invention resides further in means for automatically calibrating the recording 4 apparatus from time to time.

My invention resides in the system and apparatus hereinafter described and claimed.

For an illustration of one of the forms my invention may take, reference is to be had to the accompanying. drawings, in which:

Figure 1 is a front elevational view of recording apparatus involving my invention.

Fig. 2 is a top plan view of the apparatus shown in Fig. 1. Fig. 3 is an end elevational view of the apparatus shown in Fig. 1 looking from the left toward the right of said Fig. 1. Fig. 4 is an end elevational view of the apparatus shown in Fig. 1 looking from the right toward the left of said Fig. 1. Fig. 5 is a cross sectional'view, some parts in elevation, taken on the line AA of 1g. 1. Fig. 6 is a fragmentary top plan view showing the marking or printing means. Fig. 7 is a horizontal sectional view on the line B-B of Fig. 5. Fig. 8 is a detail view showing part of the mechanism illustrated in Fig. 1 on larger scale. Fig. 9 is an elemental front elevational view of the means for moving the marker or printer transversely of the paper or other record sheet. Fig. 10 is a diagrammatic view illustrating the electrical circuits which may be employed in one of the applications of my invention.

Upon any suitable bracket 1, shown in Fig. 2, may beswung on the hinges 2 the main frame or support 3. Upon the box 4, which may be a part of the frame'3, is supported an electric motor M on whose armature shaft 5 is a secured worm 6, Fig. 4, which meshes with and drives the worm gear 7 secured upon the main driving shaft 8 having bearings upon the frame 3 at 9 and 10. The motor M is continuously in operation and its speed is controlled by the centrifugal governor within the box 4, such governor comprising stationary contact 11 and rotating contact 12 carried on the arm 13 by a bell crank lever whose other arm is 14 upon which is disposed the weight 15, the bell crank lever being pivoted at 16 to the bracket 17 secured upon the motor shaft 5 a tension spring 18 being secured at its one end to the arm 14 and at its other end to the member 19 carried by the bracket 17. The contacts 11 and 12 are associated with the electrical circuit of the motor M, the speed control being effected as and the centrifugal governor being of the character described in my prior Patent No. 1,057,436 granted April 1, 1913. By means of this centrifugal governor, or by other suitable means, the motor shaft 5 runs at practically uniform speed, the variation in speed being preferably not more than one-half of one per cent.

Supported and movable upon the pivots 20 upon the base 3 is a lever 21 carrying at its lower end an adjustable screw 22 to which is attached one end of a spring 23 Whose other end is attached to the arm 24 secured to the base 3, the spring 23 pulling the lower end of the frame 21 toward the left as viewed in Fig. 5 and away from the observer in Fig. 1. Upon the back of the lever 21 is secured a bracket 25 between which and the lever 21 and carried by them is a pivot 26 upon which is movable the pivotal arm 27 on each end of which at 28 is a shoe of cork or other suitable material for frictionally engaging the rim 29 of the disk or wheel 30 secured upon the shaft 31 carried by and rotatable with respect to the frame 3. Secured upon the shaft 8 is a cam 32 which, in the clockwise rotation of the shaft, as viewed in Fig. 5, periodically engages the lever 21 and moves it outwardly in opposition to sprin 23 thereby lifting the friction shoes 28 carried by the arm 27 free from the rim 29 of the wheel 30. Secured to the shaft 8 is a second cam 33 which, immediately after the cam 32 has caused the freeing of the shoes 28 from the rim 29 engages the end of finger 34' upon the arm 35 secured at 36 to the frame 37 pivoted to the main frame 3 at 38, 38. The osition of the end of finger 34 may be ad iusted by the screw 39. A stop 37 on frame 3 serves to limit the travel of member 37 in one direction. Upon the frame 37 is carried the member 40 whose upper edge'41, here shown as inclined, is positioned directly beneath the needle or pointer 42 of an indicating or measuring instrument, mechanical, electrical or other type, which swings to the right or left, Fig. 1, with variations in the quantities or magnitudes to be recorded. Most of the time the needle 42, which is here shown in zero or mid position, swings freely to the right or left without engaging the edge 41, the member 40 having at its ends the stops 43 for limiting the swing of the needle 42. The needle 42 normally swings freely beneath the edges 44, preferably straight horizontal ,edges, upon the members 45 pivoted at 46, 46 to the bracket 47 on the main frame 3. The

members

45, 45 extend toward each other but a gap is left between them of sufiicient width to allow the free entry of the needle or pointer 42 when the same is in the balanced, zero or mid position. To the members 45 are secured the downwardly extending

arms

48, 48 drawn toward each other by the spring 49 whose ends are attached to these arms Associated with the lower ends of the arms 48 are the

pins

50, 50 which, as best seen in Fig. 8, are carried by the triangular member 51 hung with the arms 27 u n the pivot 26 and secured to the arms 27 in different adjustment positions by the screw 52 extending into the 111 upon the arms 27, the screw 52, extending through slot 54 in the triangular member 51. At

the lower end of the member 53 is a screw 55 by which the plate 51 may be moved with respect to the lug 53 for adjusting purposes, the spring 56 urging the plate 51 in one direction. After the nice adjustment is effected by the screw 55 to secure the proper ad- Justment the screw 52 is tightened to maintain the parts in the adjusted position.

The

pivots

38, 38 and 46, 46, are at the same height (see Fig. 1) to produce as nearly as possible a right or straight line movement of the associated parts.

At the outer ends of the arms 27 are carried projections 57 with which are adapted to be engaged by the

cams

58, 58 similar in shape and similarly positioned and secured upon the shaft 8.

The shaft 8 is continuously revolving at preferably uniform speed and as a consequence the cams 32 and 33 periodically lift the friction shoes 28 from the rim 29 and periodically raise the edges 41. So long as the needle or pointer 32 is in the zero or mid position the upward movement of the edges 41 engaging the lower side of the needle 42 raises the needle into the gap between the members 45, and nothing occurs. If however the needle 42 has been deflected either to the right orthe left, it will upon the next upward movement of the edges 41 be raised by the one or the other of them, according as the deflection has been toward the right or the left, the needle 42 then engaging one or the other of the edges 44 on the members 45 causing such member 45 to be raised by power transmitted by cam 33 through the needle 42. Assuming the needle to have deflected toward the right, the right hand member 45 will be raised and moved in a clockwise direction about its pivot throwing the lower end of the corresponding lever 48 toward the left, Fig. 1, causing it to transmit through the engagin pin 50 clockwise movements to the arms 2 about their pivot 26, it bein remembered that during this time the friction shoes 28 are free from the rim 29. Immediately after the cam 32 releases the arm 21 to the control of spring 23 which then causes the friction shoes 28 to engage the rim 29, not in the horizontal position shown in Fig. 1 but in an inclined position extending from the upper left to the lower right. The cams 32 and 33 are immediately disengaged from their co-acting members, and now the cams 58 approach the members 57 and the left hand cam 58, Fig. 1, will engage the left band member 57 and depress and return it to the position shown in Fig. 1, moving the wheel 30 around in a counter-clockwise direction due to the frictional enga ement of the shoes 28 carried by arms 2 with the rim 29. In other words the wheel 30 has been moved around in a counter-clockwise direction by power delivered from the motor M through the shaft 8. Immediately this is accomplished the parts are again in the position shown in Fig. 1.

In case the needle 42 had deflected toward the left the left hand arm 48 would have engaged the left hand pin.50 to set the arms 27 in an inclined position, but in another direction, with the result that the wheel 30 would have been moved around in a clockwise direction.

It will be noted that the gap between the inclined or slightly curved edges 41 and 44, longitudinally of which gap the needle 42 deflects, is not of constant width, but is of greatest width at the mid position of the needle and becomes progressively narrower to both the right and the left. The result is that with greater and greater deflections of needle 42 the members 15, 15 are lifted higher and higher and consequently the lower ends of the arms 48 are deflected farther and farther with corresponding increases in the angles to which the arms 27 are deflected and resultant increases in the angular movement of the wheel 30 when restored by the cams 58, these increases in angular adjustment of arms 27 and movement of disk 30 being so made proportional to the extent of deflection of needle 42. In other words greater deflections of the needle 42 are accompanied by greater and proportional movements of the wheel 30.

Secured upon the shaft 31, and therefore actuated by the wheel 30 is the grooved wheel or pulley 59 around which passes the cord 60 which passes over the grooved pulleys 61, 61 pivoted on the frame 3 at opposite ends thereof, as seen in Figs. 2, 3, 4 and 9. The ends of the cord 60 are secured by the clamp 62 to the carriage 63 adapted to slide longitudinally upon the fixed rod 64 supported at its ends on the frame 3.

The marker of the recorder is shifted transversely of the paper by the arm 65 secured to.the carriage 63. The marker may he of any suitable type, such as a pen, penoil, or any other point or line drawing or printing device. In the present instance however in which a multiple point recorder is described, the marker takes the form of a wheel 66 carrying a plurality of types or other printing devices 67, each type or charactor 67 preferably different from the others on the same wheel 66. On the end of the arm there is pivoted at 68 a link 69 to which is pivoted the inkroll 70 for inking the type, the handle 71 serving to raise the inkroll and serving also as a weight for pressing the inkrolI against the type with the desired pressure. 'T he arm 65 embraces the sleeve 72 to which the wheel 66 is secured, the sleeve 72 being shifted longitudinally of v the bar or rod 73 by the carriage 63, and the sleeve 72 and Wheel 66 rotated by rod 73. It will be understood therefore that the shifting of the wheel 30 moves the carria e 63 in one direction or another longitudinal y of the bar or rod 64, according to the direction of deflection of needle 42, and that this same movement is communicated to the type wheel 66 longitudinally of the rod or bar 73. As seen in Figs. 1 and 5 the rod 73 has a longitudinally extending groove 74 into which extends the point or stud 75 carried by the sleeve 72. By this construction the type wheel 66 may be shifted longitudinally of the rod 73, but not rotated with respect to rod 73. The rod 73 is journaledat its ends in levers 76 pivoted on shaft 77. At one end of the shaft 77 is secured a gear 78 meshing with the gear 79 secured upon the type wheel shaft 73. Secured upon the shaft 77 is a notched wheel 80 with whose teeth is adapted to engage the dog 81 pivoted at 82 on the lever 83 which is itself pivoted at 77 and whose free end 81 is adapted to be engaged by the pin 85 carried upon the gear wheel 86. Thls gear wheel 86 is driven by the motor M through the train of gearing comprising the worm 6, worm wheel 7, shaft 8, pinion 87 meshing with gear wheel 88 and driving pinion 89 meshing with the gear 86, the direction of rotation of the gear 86 being indicated by the arrow, Fig. 4. Rotated by the gear 86 is the cam 90 secured upon the shaft 91 which carries at its other end a similar cam 90, these cams 90 coiiperating with the tails 91" of the levers 76 which support the type wheel shaft 73. Each cam 90 has a notch 92 operating as hereinafter explained. The spring 93 is attached at its one end to the lever 81 and at its other end to the base 3.

On the shaft 94 is secured the roller 95 carrying spurs 96 engaging in the marginal perforations of the record paper 97 which is stored upon the roller 98 pivoted in the arms 99 extending downwardly from the frame 3. On one end of the shaft 94 which drives the paper roller 95 is a gear 100 driven by the gear 101 meshing therewith and driven by the shaft 77. The paper is unwound from the roller 98 and wound up upon the roller 95 and comes into operative relation with respect to type wheel 66, the paper after passing over roller 95 dropping into a basket, or may be wound up on another roller, not shown.

()n the shaft 77 is secured also a beveled gear 102 with which meshes a similar beveled gear 103 which drives the shaft 104 carrying on its other end a beveled gear 105 meshing with a similar beveled gear 106 which rotates the switch contact 107 over the stationary switch contacts 109 to 121 inelusive.

As the gear 86 is continuously rotated by the motor M through the train of gearing named, the tails 91 of the levers 76 ride upon the surfaces of the cams 90 and simultaneously drop into the notches whereupon the shaft 73 carrying the type wheel 66 allows the type wheel to drop into contact with the paper upon the roller 95 to print a character thereon in a position indicating the magnitude of the quantity to be recorded. Further rotation of the cams 90 immediately lifts the type wheel 66 free from the paper and soon thereafter the in 85 engages the point 84 of lever 83 moving the same in op position to the spring 93 and causing t e pawl or dog 81 engaging in a notch of the wheel 80 to step the same around one notch, the pin 85 then passing beyond the end 84 of the lever 83 the spring 93 now contracting causes the pawl to ride into the next notch of wheel 80, this wheel having as many notches as the type wheel 66 has characters and as the movable contact 107 has cooperating stationary contacts. The stepping around of the wheel 80 one notch drives gear 78 which in turn drives gear 79 which rotates shaft 73 and the sleeve 72 and type wheel 66 bringing the next character H1120 position for printing. Simultaneouslythe movable contact 107 is moved to the next stationary contact of the series. Simultaneously the paper roll 95 is stepped around to bring a resh portion of the paper into position for printing. It is to be understood however that the roller 95 may be moved uniformly, by gearing to the motor M, in place of by steps as explained. Upon the shaft 31 is secured also the disk or wheel 122, preferably of wood or other insulating material. Upon its periphery is disposed the resistance conductor R, which may be in the form of a helix extending around the periphery of the member 122, a stationary contact 123, suitably supported by an .arm 124, Fig. 2, and upon and insulated from the frame 3 engaging the bare' resistance wire R, contact 123 and resistance R functioning as hereinafter described.

The two terminals of the resistance R are brought out approximate the center of the disk 102 and communicate through the flexible double conductor cable 125, .wrapped several times around the shaft, with suitable fixed terminals indicated at 126.

Secured upon the shaft 31 is a grooved wheel or pulley 127 through which and the cord 128 the wheel 30 drives the grooved wheel or pulley 129 freely rotatable upon the hollow stationary spindle 130 supported upon the frame 3 at 131, see Fig. 7. Pivoted at 132 upon the pulley 129 is the lever 133 carrying at its outer end a member 134 extending freely through pulley 129 and adapted to engage the crown spur wheel 135 which is rotatable upon the shaft 130 independently of the pulley 129. Secured to the spur wheel 135 is the wheel or disk 136, of wood or other suitable insulating material upon whose circumference is'secured a bare resistance wire R whose two terminals communicatewith fixed terminals by means similar to those described in connection with resistance R. Engaging the resistance R is a stationary contact 137, Figs. 1 and 2, carried by the metallic spring 138 whose tension is adjusted by. the screw 139, the contact 137 and the resistance R coiiperating as hereinafter described.

The spring 140 carried by the wheel 129 tends to move the member 134 into engagement with the crown wheel 135 to cause rotation of the resistance R with respect to contact 137. Normally the member 134 is held out of engagement with wheel 135 by pin 141 extending freely through the hollow shaft 130 and bearing upon the surface of the cam 142 secured upon the shaft 77, see Figs. 5 and 7. At one point in the surface of cam 142 is a depression 143 into which the pin 141 may move allowing spring 140 to move member 134 into engagement with wheel 135 to clutch the resistance R to the wheel 129. This notch or groove 143 is so positioned that the clutching of resistance R to wheel 129 occurs at the same time with the engagement of the movable contact 107 with stationary contact 121 connected with the standard cell S hereafter referred to. Further movement of the shaft of course re sults in the unclutching of the resistance R from the wheel 129 because the pin 141 lifts the lever 133 in opposition to spring 140 to remove member 134 from engagement of the wheel 135.

In Fig. 10 I have illustrated an example of electric circuits which maybe employed in connection with theabove described.recording mechanism when employing a potentiometer method. It is to be understood however that the needle or indicating pointer 42 may respond to other than electrical forces, and to electrical forces derived from or controlled by methods other than the potentiometer methods, for example, the Wheatstone bridge method. v

In Fig. 10 144 is any suitable source of direct current, such as a battery or a storage battery. In series -with it are indicated the resistances R and R above referred to, and the resistances R R, R, and R The resistances R and R may be short circuited by inserting a plug 145 into either or both holes between the terminal blocks 146, 147 and 148. And depending upon circumstance, resistances R may be omitted.

The galvanometer G whose pointer 0r needle 42 controls the extent of movement of the arms 48, has one terminal connected to one terminal of the resistance R and its other terminal to the traveling contact 107 of the switch. The contact 123 which traverses the resistance R is connected through conductor 149 with the positive terminals of a series of thermo-couples 'I to T inclusive, and the other terminals of the thermocouples are connected to contacts 109 to 120 inclusive of the switch. The thirteenth segment 121 of the switch is connected to the positive terminal of a standard cell or battery S whose other terminal connects with one terminal of the resistance R.

The operation is as follows: Assuming the motor M to be running, the contact arm 107 is stepped around by the action of the notched wheel as hereinbefore described. Assuming it to be on contact 109, and the thermo-couple T to be subjected to an unknown temperature which is to be recorded on the paper 97, the thermo-couple T will by virtue of that temperature produce a certain difference of potential. If this difference of potential is equal to the drop of potential in the resistance R due to source of current 144 between the contact 123 and the left hand terminal of resistance R where the galvanometer G is connected, there will be no current flow through the galvanometer G and the needle or pointer 42 will remain in zero or mid position.,,and as the edges 41 periodically rise will not affect the arms 48. And the wheel 66 will print at a position representing the temperature a characterdesignating thermo-couple T upon the paper 97. If however when the contact 107v comes into engagement with the segment 109 the potential difference produced by the thermo-couple T is not equal to the drop of potential between contact 123 and the other end of the resistance R, the galvanometer G will not be balanced, but a current will be passed through it and the needle 42 will be deflected, either to the right or to the left, and consequently the wheel 30 will he stepped around, as previously described, causing the type wheel 66 to move across the paper 97 to a new position; and simultaneously the resistance R is moved around with respect to contact 123. The result is that the difference in potential between the contact 123 and the other end of the resistance R is changed in a direction to attain or approximate a balance with the potential difference produced by the couple T The shaft 8 makes many revolutions for one revolution of the gear 86 and consequently if the first movement of the disk or wheel 30 does not move the resistance R to such a position with respect to the contact 123 as to produce a balance, there is ample time for several successive movements of disk 30 to be made until finally the balance is obtained, for when a balance is attained the needle 42 when raised by the edges 41 passes freely into the gap between the members 45 without affecting either arm 48. And if such successive movements are necessary for balancing, the type wheel is also moved further across the paper and is finally in position, corresponding to a balance of the galvanometer, which measured from one edge of the paper or a base line on the paper, indicates the temperature to which the thermo-couple T is subjected. From scale 95, near the paper, may be read the magnitude recorded. Sometime later, as previously ex lained, the tails 91 of the levers 96 drop into the notches 92 and print upon the paper 97 a character referring to thermo-couple T and at the position named, that is, at a position which indicates the temperature of the thermo-junction T Immediately after the type wheel is lifted from the paper and then the pin 85 causes the stepping around of the typewheel to the next character referring to thermo-couple T and simultaneously the paper is advanced on roller 95, and simultaneously the contact 107 moves to segment 110 of the switch. Then the same operation is repeated with respect to thermo-couple T and finally the type wheel prints :1 character referring to couple T and in such position on the paper as to indicate the temperature to which thermo-couple is subjected. And so on in succession for each new thermo-couple brought into circuit by the switch the type wheel has been stepped around a notch to a new character. The result is that the apparatus prints all the characters in succession for the different thermo-couples, the apparatus automatically balancing itself against the potential difference of each thermo-couple in succession.

Once in each revolution of contact 107 the standard cell S is brought into circuit when contact 107 engages segment 121. And simultaneously, as previously explained, the resistance R has been brought into operative relation with the disk 30. If at such time the drop of potential in the resistance R due to the current from source 144 is equal to the potential of the standard cell S the galvanometer is in balance and the disk 30 will not be moved. If however such balance does not exist, the needle 42 will be deflected either to the right or to the left with the result that the disk 30 will be moved as will also the resistance R with respect to its stationary contact 137. The direction of movement is such that the amount or resistance R in circuit with the source 144 is automatically varied until the galvanometer G is again balanced. When this occurs the main potentiometer employing resistance R with the thermo-couples has been re-adjusted by comparison with the standard cell S. It is accordingly seen that not only does the apparatus by potentiometer method record the temperatures of a plurality of thermocouples, but that, periodically, the apparatus automatically re-adjusts or re-calibrates itself by varying the resistance R to the proper value.

By drawing a line through the successive characters printed upon the paper for a after returning said given thermo-couple a curve is obtained showing the variation in the potential difference produced by it. And longitudinally of the paper, between any two successive points in a given curve will be a printed character for each of the other thermo-couples.

It will be noted that while the resistance R is coupled to the disk 30 the resistance R will also be moved. But this movement of resistance R will have no effect because the circuit through the contact 123 is during such time open, because contact 107 is not on any segment connected to a thermocouple, but is in engagement only with the contact 121 connected to the standard cell S. And when the movable contact 107 again engages a segment connected to a thermocouple the unbalancing that may have been occasioned by such movement of resistance R is immediately taken care of in the re-balancing operation with respect to that thermo couple.

What I claim is:

1. The combination with a member movable in response to a change to be recorded, of a periodically operating "member adapted to engage said movable member, driving and driven clutch members, means for setting said driving clutch member with respect to said driven clutch 'member in response to engagement of said movable member by said periodically operating member, means for thereafter actuating said driving clutch member to move said driven clutch member, and a marker moved by said driven clutch member.

2. The combination with a member movable in response to a change to be recorded, of aperiodically operating member adapted to engage said movable member, driving and driven clutch members, means for setting said driving clutch member with respect to said driven clutch member in response to engagement of said movable member by said periodically operating member, means for thereafter. returnin said driving clutch member to its norma position, the return of said driving clutch member to its normal position moving said driven clutch member,

and a marker moved by said driven clutch member.

3. The combination with a member movable in res onse to a change to be recorded, of a peri 'cally operating member adapted to engage said movable member, driving and driven clutch members, means for setting said driving clutch member to different positions with respect to said driven clutch member in response to different degrees of movement of said movable member and engagement of said movable member by said periodically operating member, means thereriving clutch member to its normal position and thereby driving driven clutch member, and a member actuated by said driven clutch member.

5. The combination with a deflecting member, of a periodically operating member adapted to en age said deflecting member, driving and driven clutch members normally in engagement with each other, means for separatln said clutch members, means operative whi c said clutch members are separated for setting said driving clutch member with respect to said driven clutch member in response to engagement of said deflecting member by said periodically operating member, means for bringing said clutch members into engagement with each other after the setting of said driving clutch member, and means for thereafter actuatin said driving clutch member to move said riven clutch member. 1

6. The combination with a deflecting member, of a periodically operating member adapted to engage said deflecting member, driving and driven clutchmembers normall in engagement with each other, means for isengaging said clutch members from each other, means for setting said driving clutch member with respect to said driven clutch member during disengagement of said clutch members in response to engagement of said deflecting member by said periodically operating member, and means for thereafter returning" said driving clutch member to its normal position, the return of said driving clutch member to its normal position moving said driven clutch member.

7. The combination with a deflecting member, of a periodically operating member adapted to engage said deflecting-member, driving and driven clutch members, means for periodically disengaging said clutch members from each other, means for setting said driving clutch member with respect to' said driven clutch member during disengagement of said clutch members in response to engagement of said deflecting member by said periodically operating member, and means for thereafter moving said clutch members when reengaged.

8. The combination with a deflecting member, of a member having a smoothly continuous edge adapted to engage said de fleeting member, a source of power, a clutch controlled by said second member and actuated by said source of power through different distances in response to different deflections of said deflecting member.

9. The combination with a deflecting member, of a periodically operating member adapted to engage said deflecting member,

driving and driven clutch members, means for periodically engaging and disengaging said clutch members with and from each other, means operative when said clutch members are disengaged from each other for setting said driving clutch member with respect to said driven clutch member in response to engagement of said deflecting member by said periodically operating member, and means actuating said drivin clutch member after rengagement of sai clutch members.

10. The combination with a deflecting member, of a periodically operating member adapted to engage said deflecting member, a driven clutch member, a driving clutch member comprising a pivoted arm, means for shifting said pivoted arm with respect to said driven clutch member while disengaged from said driven clutch member in response to engagement of said deflecting member by said periodically operating member, and means for shifting said pivoted lever in reverse direction after rengagement with said driven clutch member.

11. The combination with a deflecting member, of a periodically operating member adapted to engage said deflecting member, a driven clutch member, a driving clutch member comprising av pivoted arm, means for shifting said pivoted arm with respect to said driven clutch member in response to engagement of said deflecting member by said periodically operating member, and a continuously rotating cam shifting said lever in reverse direction during its re engagement with said driven clutch member.

12. The combination with a deflecting member, of a periodically operating member adapted to engage said deflecting member, a driven clutch member, a driving clutch member comprising a rocking lever, means for rockin said lever while disengaged from said driven clutch in one direction or the other depending upon the direction of deflection of said deflecting member and in response to engagement of said deflecting member by said periodically operating member, and means for returning said rocking lever to its normal. position when reengaged with said driven clutch member.

.13. The combination with a deflecting member, of a periodically operating member adapted to engage'said deflecting member, the engaging edge of said periodically operating member being smoothly continuous and varying in distance from the path of travel of said deflecting member, dri ing and driven clutch members, means responsive to engagement of said deflecting mem ber by said periodically operating member for shifting said driving clutch member when disengaged from said driven clutch member through different distances for different deflections of said deflectin member, and means for returning said driving clutch member toward normal position when re- 'engaged with said driven clutch member.

14. The combination with a deflecting member, of a periodically operating member adapted to engage said deflecting member, a clutch member, and means for setting said clutch member actuated by said deflecting member when engaged by said periodically o erating member.

15. he combination with a deflecting member, of a periodically operating member adapted to engage said deflecting member, a pivoted member actuated by said periodically operating member through said deflecting member, and a clutch member set by said pivoted member. Y

16. The combination with a deflecting member, of a pivoted periodically operating member, a pivoted lever. actuated by said periodically operating member through said deflecting member, the pivotal axes of said periodically operating'member and said lever being in the same plane of movement of said deflecting member,.and a clutch member set by said ivoted lever.

17. The combination with a member defleeting in response to a change to be recorded, of a record 'sheet, a marker nor mally disengaged therefrom, a source of power, means controlled by said deflecting member for connecting said marker with saidsource of power for moving said marker with respect to said sheet, and automatic means forthereafter causing engagement between said marker and said sheet.

18. The combination with a member deflecting in response to a change to be re corded, of a record sheet, a marker normally disengaged therefrom. a source 0F power. means controlled by said deflecting member for connecting said marker with said source of power for 'moving said marker with respect to said sheet. automatic means for thereafter causing engagement between said marker and said sheet. and automatic means for advancing said record sheet a stop with respect to said marker.

19. In a recorder, a longitudinally moving record sheet. a multiple marker. and auto matic means for shifting said marker to said sheet and for presenting different charactors to said record sheet.

20. In a recorder, a record sheet. a multiple marker, :1 switch controllin a plurality of circuits, means maintaining .vvd relation between movable means of said switch and said marker, means for shifting said marker transversely of said shcetand for periodieally presenting a different character to said sheet, and means for shifting said switch for each marker character presented to said sheet;

21, Thecombinatioirwith a member deflecting in response to changes to be re: corded, of a record sheet, a multiple markel, a source of power, means controlled by said deflecting .niember for connecting said marker with said source of power to move said marker with respect to said sheet, and automatic means for shiftingsaid marker to bring different characters successively into operative relation with respect to said sheet.

22. The combination with a member deflecting in response to changes to here-- corded, "of a record sheet, a multiple marker, a source of power, means controlled by said deflecting member for connecting said marker with said source of power, automatic means-for shifting said marker to bring dilfercnt characters successively into operative relation with respect to said sheet, and automatic means for causing temporary engagement of said sheet by said marker.-

23.-The combination -with an'electrical instrument bavinga deflecting member, of a plurality of circuits, a switch for bringing said instrument into operative relation with said circuits inisnccession, a source' of power for actuating, s'aid switch, amarker, means controlled by said deflecting member for connecting said marker to said source of power for shiftingsaid marker, a plurality of characters on said marker, and means operated by said source of power simultaneonsly with said switch for shifting said marker to bring a new character into operatire position. s r I '24. The combination with an electrical iii-- strumcut having a deflecting member, of a guurality of circuits, a switch for bringing said instrument into operative relation with said circuits in SlIccQz-SlOD a source of power for actuating said switch, a marker, means controlled by said deflecting member for. connecting said marker to said source of power for shifting said marker, a plurality of characters on said marker, means oper ated by said source of power simultaneously with said switch for shifting said marker to bring a new character into operative po sition, and means for bringing each new character temporarily into engagement with a record sheet.

The combin tion with an electrical recorder, of a potentiometer circuit controlling the same, a source of current of fixed electro-motire-force, and means automatically adjusting the resistance in'said potentiometer circuit to cause a drop of potential in another resistance in said circuit equal to the electro-motive-force of said source.

2G. The combination with an electrical recorder, of a potentiometer circuit controlling the same, a sourceof current of fixed 4'l0('tlO-lllOtlVO-fOl'CC, means automaticallyadjusting the resistance in said potentiome; ter circuit to cause a drop-of'potential in another resistance in saidcircnit-upial to the electro-motive-force of said source,,a co n-'v tact associated with said first named resistance, and means -auton1atically-disconnect-f ing said recorder from said potentiometer circuit and causing relative niovement be tween said contact and 'said resistances-i= 80 .27. The combination with an electrical-jre eorder, of a potentiometer circuit controlling the same,.a fixed resistance in said circuit, an adjustable resistancein said circuit com: prising a resistance and.a-contactnmorable with respect to each other,-means for mov ing said contact and resistance withrespect to each other, a source of current offixed electrii-motive-forcc, a switch for disconnecting said recorder and for connecting said source, and 'means simultaneously; automat' cally connecting-said adjusting means witha movable fmcmbe of said re Carder. w .V; v ,7 "a

28. The combination witlr'apotentiometer circuit; of a galvanometer, a source of power, a resistanceinsaid. potentiometer circuitharing a coiiperating'relatively movable contact, a fixed resistance in said circuit, a

source of fixed electro-motire-force, and

means controlled by said galranometer for making a connection to said source of power for moving said fiist named resistance and tact movable with said-marker forbala'nc- 1 5 ing said galvanometer, means for automatically disconnecting said galvanometer from. the source of unknown electro-motire-force and connecting it to a sourcc of fixed electromotive-force, and means for simultaneously 1 0 automatically adjusting the resistance in said potentiometer circuit.

30. The combination with a potentiometer circuit and its galvanometer, of a.-plurality of circuits containing thermo-couples a nail 121i tiple point recorder controlled by said gal ranometer for recording the potentials of said thermo-couples in succession, and means associated with said recorder for pcriodically automatically equating a potential drop in said potentiometer circuit to a potential of fixed value.

31. The combination with a potentiometer circuit and its galvanometer, of a plurality of circuits containing current sources, a multiple point recorder-controlled by said galvanometer for recording the potentials of said source in succession, and means associatedwith said recorder for periodically automatically equating a potential drop in said potentiometer circuit to a potential of fixed value.

32. The combination with a potentiometer circuit and its galvanometer, of a resistance in said potentiometer circuit, means for varying said resistance, a source of power, means controlled by said galvanometer for connecting said resistance varying means with said source of power, a source of current of fixed electro-motive-force associated with said galvanometer and said .potentiometer circuit, the variation of said resistance continuing until said galvanometer is balanced by equal and opposite potentials of said source of current and of a portion of said potentiometer circuit.

33. The combination with a deflecting member, of movable abutments between which said member is movable, means for actuating one of said abutments to engage said deflecting member and thereby actuate the other of said abutments, a source of power, a marker, and means controlled by said second abutment for controlling connection between said marker and said source of power.

34;. The combination with a deflecting member, of movable abutments between which said member is movable, driving and driven clutch members, a marker connected with said driven clutch member, means for moving one of said abutments to engage said deflecting member and thereby actuate the second abutment, said second abutment setting said driving clutch member with respect to said driven clutch member.

35. The combination .with a deflecting member, of driving and driven clutch members, means periodically disengaging said driving clutch member from said driven clutch member, a periodically operating member adapted to engage said deflecting member to set said driving clutch member while disengaged from said driven clutch member with respect thereto, a record sheet, a marker connected with said driven clutch member and normally separated from said record sheet, means for actuating said driving clutch member to move said marker, and means thereafter bringing said marker into engagement with said record sheet.

36. The combination with a deflecting member, of driving and driven clutch members, a member adapted to engage said deflecting member to set said driving clutch 37. The combination with an electrical instrument having a deflecting member, of a switch for bringing said instrument into a circuit, a variable resistance, a source of power, means for varying sai'd, resistance, and means for coupling said resistance varying means with said source of power when the circuit of said instrument is closed through said switch.

38. The combination with an electrical instrument having a deflecting member, of a switch for bringing said-instrument into a. circuit, a resistance, means for varying said resistance, a source of power, a clutch con trolled by said deflecting member intervening between said source of power and said resistance varying means, and a second clutch intervening between the driven member of said first named clutch and said resistance varying means, said second clutch operative when said switch brings said instrument into said circuit.

39. The combination with an electrical instrument having a deflecting member, of a switch for bringing said instrument into a circuit, a variable resistance, means for varying said resistance, a source of power by which said switch is operated, and means for coupling said resistance varying means with said source of power when said instru ment is brought into circuit by said switch.

40. The combination with a recorder comprising a source of power and a. multi le marker, of a deflecting member controlling connection between said marker and said source of power, a plurality of circuits controlling said deflecting member, a switch actuated by said'source of power for bringing said deflecting member under control of said circuits successively, a calibration circuit under whose control said deflecting member is brought by said switch, and means.

for adjusting said calibration circuit, said deflecting member controlling the connection between said adjusting means and said source of power.

41. In a recorder, the combination with a longitudinally movable record sheet, of a multiple marker, means for moving said marker transversely of said record sheet, for each of a plurality of different changes to be recorded, and means for shifting said marker to present a different character to said reference sheet for each of said diflerent changes to be recorded.-

42. In a recorder, the combination with a.

deflecting member, of a source of power, a marker having a plurality of characters, a longitudinally movable record sheet, means controlled by said deflecting member for couplng said marker to said source of power for moving said marker transversely of said sheet, and means actuated by said source of power for moving said marker to present a different character to said record sheet for each of a plurality of different changes to be recorded.

43. In a recorder, the combination with a source of power, of a deflecting member, a marker having a plurality of characters, a longitudinally movable record sheet, means for bringing said deflecting member under the control of a plurality of different quantities to be recorded, a coupling between said marker and said source of power controlled by said deflecting member for causing movement of said marker transversely of said record sheet, and means actuated by said source of power for moving said marker to present a different character to said record sheet for each of said quantities to be recorded.

44. The combination with a deflecting member, of a member having a smoothly continuous sloping edge adapted to engage said deflecting member, a source of power, a clutch controlled by said second member and actuated by said source of power through different distances in response to different deflections of said deflecting member.

45. The combination with a deflecting member, of a member having a smoothly continuous sloping edge adapted to engage said deflecting member, a source of power, a clutch controlled by said second member and actuated by said source of power through different distances in response to different deflections of said deflecting member, and a marker actuated by said clutch.

46. The combination with a deflecting member, bf abutments having smoothly continuous edges varying in distance from each other between which said member deflects, a source of power, a clutch controlled by one of said abutments and actuated by said source of power through different distances in response to different deflections of said deflecting member.

47. The combination with a deflecting member, of movable abutments between which said member is movable, said abutments having smoothly continuous edges varying in distance from each other, means for actuating one of said abutments to engage said deflecting member and thereby actuate the other of said abutments, a source of power, a marker, and means controlled by saidsccond abutment for controlling connection between said marker and said source of power.

48. The combination with a deflecting member, of movable abutments between which said member is movable, said abutmen'ts having smoothly continuous edges varying in distance from each other, means for actuating one of said abutments to engage said deflecting member and thereby actuate the other of said abutments, and a marker controlled by said second abutment.

49. The combination with a deflecting member, of movable abutments between which said member is movable, said abutments having smoothly continuous edges varying in distance from each other, driving and driven clutch members, a marker connected with said driven clutch member,

means for moving one of said abutments'to engage said deflecting member and thereby actuate the second abutment, said second abutmentsetting said driving clutch member with respect to said driven clutch member.

50. In a recorder, a record sheet, a marker member having a plurality of characters thereon, a source of power, means responsive to a change to be recorded for coupling said marker member to said source of power to move said marker member transversely of said sheet, means actuated by said source of power for thereafter bringing said marker member into engagement with said record sheet, and means actuated by said source of power for thereafter rotating said marker member to present a different character.

51. In a recorder, a record sheet, a marker member having a plurality of characters thereon, a source of power, a clutch for cou pling said marker member to said source of power for moving said marker member transversely of'said sheet, a member responsive to a change to be recorded controlling said clutch, and means actuated by said source of power independently of said clutch for thereafter bringing said marker member into engagement with said sheet and rotating said marker member to present a new character.

In testimony whereof I have hereunto affixed my signature in the presence of the two subscribing witnesses.

MORRIS E. LEEDS.

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