US2539832A

US2539832A - Apparatus for producing oscillographic records

Info

Publication number: US2539832A
Application number: US463380A
Authority: US
Inventors: Claude M Hathaway
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-10-26
Filing date: 1942-10-26
Publication date: 1951-01-30
Anticipated expiration: 1968-01-30

Description

Jan. 30, 1951 c. M. HATHAWAY 2,539,832

APPARATUS FOR PRODUCING OSCILLOGRAPHIC RECORDS Filed Oct. 26, 1942 2 Sheets-Sheet l flail/6 28 MHaZ /zaweg C. M. HATHAWAY APPARATUS FOR PRODUCING OSCILLOGRAPHIC RECORDS Jan. 30, 1951 Filed Oct. 26, 1942 2 Sheets-Sheet 2 AJ/3073A ww mm S3 CZazzde Patented Jan. 30, 1951 APPARATUS FOR PRODUCING OSCILLOGRAPHIC RECORDS Claude M. Hathaway, Denver, 0010.

Application October 26, 1942, Serial No. 463,380

13 Claims.

My invention relates to oscillographs or recording systems and an apparatus for producing an oscillographic record.

Frequently, it is desired to provide an oscillograph which is designed for automatically recording chance or unanticipated transients and disturbances. In providing any arrangement suitable for this purpose, it is desired to maintain the oscillograph in a substantially de-energized condition during all periods when no transients or disturbances are occurring. To maintain the oscillograph de-energized for such periods requires some arrangement whereby fullspeed recording of the oscillograph may be obtained within a relatively short time interval after the beginning of a transient or disturbance. Since oscillograph recording mechanisms are usually provided with a motor driving means and a roll of record paper or film it will readily be appreciated that these elements have a certain amount of inertia which must be overcome before full speed operation thereof is obtainable. Since however, a record is desired shortly after the beginning of a disturbance or fault, other means must be provided which will provide for such a record during the time that the inertia of the elements is being overcome and thereafter when full speed of the normal recording elements is obtained, the initial recordin apparatus may be permitted to become inactive. Therefore in accordance with the present invention, means are provided which are responsive to an abnormal condition or disturbance to initiate the normal recording apparatus of an oscillograph and also to start into operation an auxiliary apparatus for making a record during the early portion of the operating period immediately following such disturbances. This is accomplished by providing a device having a relatively high initial energy value so as to rapidly place into motion certain other devices and thereafter the operation of the auxiliary apparatus is gradually reduced until the acceleration of the regular recording apparatus has brought it to its normal operating speed.

Therefore it is an object of my invention to provide an improved oscillograph arrangement which will automatically record chance and unanticipated transients and disturbances.

Another object of my invention is to provide in an automatic oscillograph an auxiliary record driving mechanism operated by means having a high initial energy value.

Another object of my invention is to provide in an automatic oscillograph a high energy record driving mechanism which is operative during the initial stages of recordation during the period when the normal recording apparatus is accelerating to its normal operating speed.

Still another object of my invention is to provide a record driving mechanism in anoscillograph which utilizes stored mechanical energy which is released in response to the occurrence of a transient, fault or disturbance.

Still another object of my invention is to provide a recording apparatus for an oscillograph which upon the occurrence of a transient or disturbance will within a relatively brief time interval move the record receivin medium at substantially the normal operating speed thereof.

A further object of my invention is to provide an improved apparatus for producing an oscillographic record which will operate for a predetermined time interval after the occurrence of a disturbance or transient. A

Still another object of my invention is to provide an improved apparatus for obtaining a record which after a predetermined time interval will store energy in a mechanism for use during the initial period of the next recording interval.

' A still further object of my invention is to provide in an automatic oscillograph an improved arrangement for rendering the oscillograph inoperative during the period in which the mechanism thereof is being reset for recording a successive transient.

Other and further objects of my invention will become more readily apparent by reference to the following specification taken in connection with the accompanying drawings wherein Figure 1 is a circuit diagram of the electrical apparatus controlling the automatic operation of an oscillograph; Figure 2 is a schematic representation of various mechanical elements provided for making a record; and Figure 3 is a curve illustrating certain operating characteristics of various elements comprising an oscillograph constructed in accordance with my invention.

Referring more particularly to Figure 1, there is shown a pair of terminals ll connected to a suitable source of power. Connected across the source of power is a series of pairs of contacts l2, l3 and M which are connected in series with three relays in parallel, one having a coil I5, another having a coil l6, and the other having a coil 20. a

The relays I6 and 29 are arranged normally to hold thereagainst armatures 21 and 3!! respectively, the purpose of which will become more readily apparent in the description given in connection with Figure 2. The pairs of contacts l2, l3 and M are each controlled by one of a plurality of armatures H, l8 and I9 which are arranged opposite a plurality of magnetic relay cores 2|,

voltage relay having an armature H which is held in the position shown by the energy flowing through the coil 24. When the voltage across the coil 24 decreases below a predetermined amount,

the armature I! will drop because of a decrease in the magnetic flux of the relay 24 and the fact that the armature is sprin biased to open the contacts 62. The relays 22 and 23 each have a soft iron core provided with a coil so that when an over-voltage condition or an over-current condition occurs the relay will attract its armature. In order to provide high speed operation in response to transient conditions the armatures i8 and 59 are normally held downward by the attraction of permanent magnets 9 and i8 thereby holding the contacts is and i l in closed circuit relation. When the attraction of the upper magnet exceeds that of the permanent magnet, the armature is pulled upwardly away from the permanent magnet. Each of the armatures is also spring biased toward this upward position. The permanent magnet normally has suincient strength to retain the armature in closed circuit position until the electromagnet is energized. Whenever an electromagnet is energized, the armature is pulled away from a permanent magnet and thus the attraction of the permanent magnet is greatly decreased thus resultin in a highly effective force for moving the armature. The armature once having been attracted away from the permanent magnet is retained in its position by a suitable spring bias.

Thus if any one of the relays 2!, 22 or is actuated in response to the occurrence of a condition which it is desired to be recorded, the armature thereof will be moved to op n the contacts controlled thereby. Thus actuation of one of these relays will cause the opening of one of the pairs of contacts i2, E3 or it. When any one of these pairs of contacts are opened, the relay coils i5, i and 29 will become de-energized The r lay !5 is provided with stationary contacts 2E3, and 341 and with cooperating

movabl contacts

29, 32 and 33. There is also provided a resetting mechanism for the armatui ii to 59 comprising a plurality of levers and 3? which are connected to the core of a solenoid 353, one side of which is connected to one terminal i i of the source of power and the other side of which is connected to a contact 39'ar= ranged to cooperate with a contac't' i-l which in turn is connected to the other terminal i i of the source of power. The contacts 33 and ii are normally open circuit and are arranged to be closed for a short time interval by a cam which is driven by a motor 63. The motor by driving the cam 52 also operates a switch having contacts to is inclu ive, so arranged that when actuated, first the contacts l 'i and 25 are closed, then the contacts Q5 and ll and thereafter the

contacts

48 and 39 are opened from their normally closed circuit relation.

i'here is also provided a plurality of relays having coils 5i, 52and 53. The relay El is pro vided with two movable contacts '53 and 55 which are normally in open circuit relation with resnect to stationary cooperating contacts 56 and The relay 52 is provided with a movable contact which is normally in closed circuit relation with a contact 59 but which may he moved therefrom to closed circuit relation with contact G5. The relay 53 is provided with two movable contacts 62 and 63 which are arranged to be moved to closed circuit relation with stationary contacts 6 3 and 65. There is also provided a motor 68 which drives a cam switch 6! arranged to close for a short interval a pair of contacts 68 and E59 and thereafter to open a pair of normally closed contacts ii and 32. A shutter closing solenoid i3 is connected between the contact 3 1 of the relay coil 55 and the contact ll of the switch operated by the cam 32.

The contact 28 of the relay i5 is connected to one terminal of the relay 5! and also to the contact GS of the switch operated by the cam 52 which in turn is connected to the contact 32 of the re lay H5. The contact 29 which cooperates with the contact 28 is connected to one side of the source of power. The contact 32 which cooperates with the contact 3i is connected to the contact id of the cam switch 42 and also to the contact 56 of the relay 5E. The contact M of the cam switch 62 is connected to the contact 5'! of the relay 5!, one side of the relay 52 and also to one side of the motor 63. The other side of the relay 52 and the other side of the motor 43 are connected to the return wire of the power source H. The contacts 45 and 45 of the cam switch 52 and the contacts 5 5 and 55 of the relay 55 are connected to the upper side of the source of power H. The contact 58 of the relay 52 is connected to the upper side of the source of power 5 i. The contact 59 which normally engages the contact 53 is connected to the contact 83 of the relay 5-3 and also to the contact 69 of the switch operated by the cam iii. The contact 6! of the relay 52 is connected to one side of the relay 53 and also to the contact ii of the switch operated by the cam 5?. The other side of the relay 53 is connected to the other terminal of the power source H. The contact ii of the cam switch Ell is connected to the contact 6 of the relay 53. connected to the contact 63 of the cam switch 5'! and al o to one side of the motor 55.

Connected in parallel with the pairs of contacts i2, i3 and M which are controlled by the armatures ill, 98 and i9 of the relays 2Q, 25 and 26 respectively, are a pair of contacts and (it! which normally are in open circuit relation. The contact 59 is mounted on or actuated by a lever iii which is spring biased by a spring ii} towards closed position. The lever Till is arranged to onerate in response to exhaustion of the supplyof record receiving material in a record magazine thereby to render inoperativethe entire apparatus when the record receiving material has been exhausted. The purpose and operation of this arrangement will become more readily apparent in the description of the operation of the ap paratus.

Referring now to the schematic showing of Figure 2 of the drawing, there isprovided a source of light M which is directed upon the movable elements of a plurality of galvanometers one of which is indicated by the rectangle from which the light is reflected towards alens it which directs the light towards a record mate? rial or film ll whenever a shutter '58 is not interf, posed infront-of the-lens 7-6; A plurality-of-gal The contact 65 of the relay 53 is vanometers are arranged in a row extending in back of the first galvanometer represented by the rectangle 15. The shutter 18 is actuated by a lever -'|9 which is spring biased by a spring 8| in a direction tending to move the shutter out of the path of the light between the galvanometer l5 and the lens '56. The lever 19 is latched by one end of an armature 39 which is retained in that position by the magnetic flux of the core by the normally energized relay 29. When the coil surrounding the core of the relay 2?] is de-energized, the armature is released thereby disengaging the lever 18 so as to move the shutter 18 out of the light path. After the recording apparatus has operated for a predetermined period of time, the coil is again energized and a solenoid i3 is energized so that a rod operated thereby engages one end of the lever '19 which again moves the shutter 18 into the path of the light and latches the shutter into this position by engaging armature 30 of the relay 20. The relay I6 which is provided with an armature 2'! retains in latched position a lever 82 until the coil I6 is deenergized. The lever 82 is retained in latched position against the action of the bias of a tenwhich extends through an aperture 86 formed adjacent one end of a connecting rod 8'1. At a point adiacent the other end of the lever 82, there is a dash pot 88 which serves to retard the motion of the lever 82 after the lever has moved a predetermined distance upon being released by disengagement of the lever 82 from the armature 21. The particular function and operation of the dash pot 88 with respect to the lever 82 will subsequently become more readily apparent in the explanation of the operation of the oscillograph a paratus at which time reference will also be made to Figure 3.

The other extremity of the connecting rod 57 is connected to a crank or cam member 89 when in turn is driven by the motor 66. The crank 89 is also connected to a link 9|, one extremity of which is pivotally connected to an intermediate portion of a lever 93. At the free end of the lever 93, there is positioned a roller 94 which is arranged to engage at certain times, the record paper or film TI. The recording apparatus includes a supply magazine 95 from which the record receiving material T1 is supplied, and after the record has been made, the record receiving material is taken up in a receiving magazine 96. Interposed between the supply magazine 95 and the receiving magazine 95 are three idler rollers 91 to 99. The motor 43 is connected by means of a spring biased friction clutch lilll to the record receiving roll within the receiving magazine 96. The motor 43 also is connected to one of a pair of rolls HM and I222 which normally, when the motor 43 is operating at full speed, operate to move the record receiving material or paper therebetween at a predetermined relatively constant rate The initial positions of the roller 84 and the roller 94 are shown in solid lines, and the subsequent positions are indicated by the dotted lines. In the solid line position illustrated, the mechanism is in readiness to respond to the detection of a transient or disturbance by one of the relays 24 to 29 of Figure 1 whereupon the relays l5 and 20 will be de-energized thereby permitting the roller 84 to move to its second positiong After the recording apparatus has ill) been recording for a certain time interval, the motor 66 will become energized thus moving the crank 89 to position the roller 94 at its second position which brings about the formation of a loop of record receiving material at I03. The record receiving paper may therefore be traced from the supply magazine to the idler roller 97, past the roller 94 of the lever 93, thence to the idler roller 98, over roller 99, the roller 84 of the lever 82, between the rollers |0| and I92, and then into the receiving magazine 96. The roller 99 is positioned beneath the lens 16 so that the record on the paper is made when the paper passes over this roller 99.

The record magazine 95 is provided with a lever mechanism indicated by the lever 19 which is arranged to be responsive to the depletion of the record receiving paper or material in the magazine 95. When the record receiving material in the magazine 95 has been exhausted, the lever mechanism represented by the lever 16 will be permitted to operate since this mechanism is biased by a suitable spring 40 so arranged as to tend to close the contacts 5|! and 6! Therefore when the record receiving material magazine is empty, the contacts 59 and 69 are closed, thereby preventing de-energization of the relays I5, l6 and 29 and hence the entire recording apparatus is maintained in an inoperative condition.

Reference may now be had to Figures 1 and 2 in connection with the following explanation of the sequence of operations occurring in a cycle of operation of the apparatus. It will be assumed that one of the relays 24 to 26 has been actuated in response to a fault, a transient or a disturbance. Thus the armature of one of these relays is actuated so that one of the pairs of contacts l2, I3 or H! is opened thereby de-energizing'the relays l5, I6 and 29. The de-energization of the relay 20 permits the shutter 18 to snap open so that light from the source I4 impinging on the galvanometers 15 may pass through the lens 16 to the paper I! immedately above the roller 99. The de-energization of the relay l5 releases the armature 2! from engagement with the lever 82 so that the tension spring 83 moves the roller 84 toward the left. The lever 82 is permitted a certain amount of relatively free movement before the collar I23 on the end of the piston rod of the dash pct 88 is engaged. The de-energization of the relay l5 permits the closing of the relay contacts 28, 29; 3|, 32; and the opening of contacts 33, 3Q. The closing of the contacts 28, 29 energizes the relay 5| so that its contacts 54., 55 and 55, 51 are closed. The closing of the contacts 54, 55 looks in the relay 5| since this brings about a short circuiting of the contacts 28, 29 of the relay IS. The relay 5| can now only be opened. at a subsequent time by the opening of the contacts 48, 49 of the cam switch 42 which are in series with the locking circuit. The contacts 55 and 51 of the relay 5| when closed bring about the energization of the motor 43 which drives the cam 42, the driving rollers NH and H32, and the takeu reel within the receiving magazine 96. The motor 43 thereupon accelerates until its normal operating speed has been attained.

The closing of the contacts 55 and 51 of the relay 5! also causes energisation of the relay 52 so that its contacts 58 and 59 are separated and contacts 58'and 5| areclosed. The closing of the contacts 58 and 6| of the relay 52 energizes the relay 53 thereby closing the

contacts

63, 55 and B2, 64. The closing of the contacts 52, fi lshort the relay 53 will not open when these contacts are again opened. After the relay 53 has been locked in by the closing of the contacts 52, 54, the relay cannot be opened until the contacts 1 I, 12 of the cam switch Bl are interrupted since these contacts are connected between the contacts 52, 64 and the relay coil of the relay 53. The contacts 63, 65 of the relay 53 are in circuit with the motor 56 which however is prevented from running since it is connected through the open contacts 58, 59 of the relay 52 to one side of the power source H. The resetting motor 65 therefore cannot start until the relay 52 is deenergized thereby permitting the closing of the contacts 58, 59. I v

' When the chart driving motor 43 is started by the operation of the relay which closes the contacts 55, 51, the cam 42 begins to rotate in a clockwise manner. After about three-fourths of a revolution, the contacts (it, 4% are closed which energizes the solenoid 38, so as to operate the levers 95 to 971' to reset the armatures ll to H9 of the starting relays 24 to 25. If at that time there is no longer any disturbance affecting any of these relays, the armatures thereof will remain reset so that the relays or electromagnets it and 26, are energized and the reTay l5 will have opened its contacts. The motor 43 and the cam 42 will continue to run because the relay Si is locked in. As the cam 42 continues to rotate, the contacts 44 and 45 which are in parallel with contacts 55, 51 of relay 5i will first be closed. The closng of the contacts 46 and 41 energizes the shutter closing solenoid E3 to move the shutter in front of the lens. The next contacts to be actuated by the cam 42 are cont-acts 43 and 49 which are thereupon separated. These contacts are in the holding circuit for the relay 5! which when deenergized, opens the contacts 55 and 5'? of the motor 53. The motor 43 however continues to run because the closed contacts and 45 are in parallel with the contacts 55 and 51. The cam therefore continues to move until the contacts 44 and 45 are opened. When these contacts are opened, the shutter closing solenoid E3, the motor 43 and the relay 52 are all de-energized. When the relay 52 is deenergized, the contact 58 strikes the contact 59 thereby setting into operation the resetting motor 66 which drives the crank 89. The crank 89 moves the connecting rod 81 so thatthe lever 82 is locked into position by the armature 27 of the electromagnet It. The roller 94 is moved from its solid line position to its dotted line position thereby establishing a new free loop of paper i935. The crank continues to rot-ate to return the rol er 94 to its solid line position. The resetting motor 55 thereupon is de-energized by the operation of the cam 67 which closes the contacts 58, 59 and opens contacts ii and '52. The opening of the contacts H and i2 tie-energizes the relay 53 thereby opening the contacts 53, 65. This howeverdoes not stop the resetting motor 66 because these contacts are short cirouited by the contacts 68, 59. The cam 6? rotates then sufficiently until the contacts 63, as open thereby stopping the resetting motor as after one revolutionof the cam 51. The oscillograph apparatus therefore has beenreturned to its original condition and is now ready fo another cycle of operation. I If at the time that the chart motor 49 was driving the cam 42 to the position where the'contacts 4i and 35 were engaged, there stll has been a disturbance on any one of the relays 24 to 26, one of these relays would not have remained reset-ed that one -01- the pair's-pf contacts lZ to I4 would again have opened. This would have brought about a closing of the contacts 28, 29 and (H, 32 of the relay 15 as soon as the contacts 39, 4| of the cam switch had opened. Since the contacts 3!, S2 of the relay i5 are across the contacts 48, 49 of the cam switch 42, the relay 5| would not have been opened when the stud on the cam 42 operated these latter contacts. Therefore, the chart motor 43 would have continued to drive the cam 42 for another revolution. Therefore, the oscillograph would continue in operation until all of the starting relays 24 to 26 have their armatures ll to E9 reset so as to close the pairs of contacts I2 to [4.

If at the time that the resetting solenoid 38 had closed all of the armatures I? to I9 of the starting relays 24 to 26, and the resetting motor 66 has started operating, a subsequent actuation of any one of the starting relays will not start the oscillograph until the resetting operation has been completed. This is brought about by the fact that a relay til is connected in parallel with the motor 65 and its contacts 99 are in parallel with the pairs of contacts 52 to i l of the starting relays and the electromagnets l6 and 28. This makes it impossible to tie-energize the relay l5 as long as potential is being supplied to the resetting motor 66 and hence no cycle of operation can be initiated unless the relay i5 is de-energized.

In the previous description of the operation, it will be remembered that de-energization of the electromagnet it permits the armature 2'? to unlatch the lever 82 which was permitted a certain free movement before engaging the dash pot 88. By referring to Figure 3, it will be seen that there has been plotted velocity against time. The curve represents the operation of the roller 84. The roller therefore during a small time interval I06 which maybe in the vicinity of one twohundred-fortieth of a second permits relatively rapid acceleration of ths roller until the maximum is reached whereupon the dash pot 88 becomeseifective. Thereafter, there is a deceleration along the curve as shown. Over the period of the curve E95, the chart motor 43 is accelerated and this acceleration curve may approximate the curve such as it? so that it may be seen that shortly after the time interval I65, the resultant velocity of the paper 'll across the roller 99 is a relatively constant quantity, This action takes place because the driving rollers Illl and H02 are accelerated until the normal operation thereof is obtained. The normal operation of the rollers HM and sea is reached at about the time that the roller 84 has reached the limit of its travel. The receiving magazine roller of the magazine 93 is driven through a friction clutch which tends to drive it faster than necessary so as to keep the paper tightly wound on the reroll spool. The paper passing through the rollers IUI and W2 however, if the normal speed of these rollers has been attained, is at a constant rate regardless of the amount of paper in the supply magazine or in the receiving magazine. From the above description, it will be seen that when the oscillograph is not recording there are no parts in motion and only the oscillograph lamp l4 is energized in addition to the relays 55, I 5 and 29. From Figure 3, it will be seen that full speed operation of the record obtained within a rela tively short time interval such as approximately one two-'hundred-fortieth of a second after a transient condition has begun.

Since an automatic apparatus has been provided for recording the currents of transients cit-unanticipated con'ditionsit willheappreciated that it is desired to reduce the operation of the oscillograph to a minimum. In addition to plyof record material or paper in the supply magazine 95 has been exhausted. This is ac- .complished by providing a suitable lever means indicated by the lever 10 which is biased by a spring 48 so as to tend to close a pair of contacts 50 and 69. When the record material has been used up, the contacts and 60 will be closed. Since the contacts 59 and 60 are in parallel with the contacts l2, l3 and 14 of the relays 24 to 25, it will be appreciated that any transient occuring which may open any of the contacts 12 to Hi cannot initiate the operation of the oscillographic apparatus since the opening of one or more of such contacts cannot deenergize the relays l5, l6 and 20. Therefore, the oscillogranh is maintained in an inoperative condition until a new supply of record material is provided for the magazine 95.

While for the purposes of illustrating and de" scribing my invention, a particular embodiment has been employed, it is to be understood that I am not to be limited thereby since obviously modifications may be made in the circuit arrangements and in the mechanical instrumentalities employed without departing from the spirit and scope of my invention as set forth in the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In an oscillographic recor ing apparatus, the combination comprising a source of light, a galvanometer, means for directing light from said galvanometer to a recording point, a normally closed shutter interposed between said galvanometer and said recording point, mechani cal means biasing said shutter toward an open position, electromagnetic means for retaining said shutter in closed position, and means responsive to a phenomenon to be recorded for de-energizing said electromagnetic means retaining said shutter in closed position.

2. In an oscillographic recording apparatus,

the combination comprising means responsive to an occurrence of a condition to be recorded for initiating the operation of said recording apparatus for a predetermined time interval, means for moving a record receiving medium past a recording pointand an auxiliary record receiving medium moving means arranged to be operative during-the period in which said first means accelerates to its normal operating speed, said auxiliary means including mechanical energy storage means adapted to move with high initial velocity and being arranged to be released upon occurrence of said condition to move said record receiving medium past a recording point at a velocity comparable to the normal velocity of the record receiving medium as moved by said first means at its normal operating speed, and means for gradually decreasing the velocity of said auxiliary means during the period of acceleration of said first mentioned record moving means.

3. In a recording apparatus, the combination comprising a source of record receiving medium, a recording point, means responsive to the co currence of a condition to be recorded for producing a record on said record receiving medium, normally inoperative means for moving said record receiving medium past said recording point, means comprising a tension spring and a lever arranged to move said record receiving medium past said recording point at a relatively high initial velocity upon occurrence of a condition to be recorded, means responsive to the occurrence of the condition for energizing said normally inoperative means, and a retarding means arranged to be energized by said lever after movement over a predetermined distance, said retarding means operating ,to decelerate the movement of said lever whereby said record receiving medium will pass said recording point at a relatively uniform rate during the acceleration period of said normally inoperative means for moving said record receiving medium.

4. In an oscillograph for recording automatically the occurrence of a condition to be recorded including a record receiving medium moving means normally maintained in an inoperative condition, an energy storage means, an auxiliary receiving medium moving means arranged to be actuated by said energy storage means upon occurrence of said condition, means responsive to occurrence of said condition for rendering operative said record receiving medium moving means, and means correlating the movements of both said record receiving medium moving means so as to move the record receiving medium past a recording point at a relatively constant rate of speed.

5. In a recording apparatus, the combination comprising a source of record receiving medium, a recording point, normally inoperative means for moving said record receiving medium past said recording point, and means comprising a tension spring and a lever arranged to move said record receiving medium past said recording point at a relatively high initial velocity upon occurrence of a condition to be recorded, means responsive to the occurrence of said condition for energizing said normally inoperative means, and a retarding means arranged to be engaged by said lever after movement over a predetermined distance, said retarding means operating to decelerate the movement of said lever, whereby said record receiving medium will pass said recording point at a relatively uniform rate during the acceleration period of said normally inoperative means for moving said receiving medi- 6. In an automatic recording oscillograph, having a plurality of galvanometer elements, the

combination of a plurality of relays each arranged to be responsive to a different condition to be recorded, a plurality of serially connected contacts each arranged to be interrupted by the action of one of said relays, a recording point, a light source for said galvanometer elements, means directing light therefrom to said recording point, a shutter retained in closed position adjacent said recording point by electromagnetic means connected in series with said contacts, said shutter being interposed in the path of said light, means controlled by said relays for opening said shutter, and means also connected in series with said contacts for controlling a cycle of operation of said automatic oscillograph.

7. The combination comprising a supply roll or" record paper, a recording point for making a record on said paper, means for forming a loop of paper of variable size between said roll and said recording point, means for driving said record paper past said recording point, and auxiliary means between said recording point and said record paper driving means for moving and increasin the size of saidloo of said paper past driving .said record paper past said recording point at a constant rate, auxiliary means be-- tween saidfrecording pointand said driving means for moving said paper past said recording point .during the acceleration periodof said first means, said auxiliary means including mechanical energy storage means to actuate said auxiliary means for a relatively short time interval after .the initiationof operation of said apparatus, and means operative at the end of a period of operation of said apparatus for actuating said paper 1001?) forming means and for storing energy in said mechanical energy storage means.

9. In an oscillographic recording apparatus, means for moving record receiving material for a predetermined time interval upon the occurrence of a condition to be recorded, auxiliary record receiving material moving apparatus operative only during the acceleration period of the operation of said first record receiving moving means, said auxiliary apparatus including mechanical energy storage means arranged to be released upon occurrence of said condition to'actuate said apparatus and means subsequently operative at the end of the time interval of operation-of said first record receiving moving means for storing energy in said mechanism for use during the next --cycle of operation of said recording apparatus.

10. In an oscillographic recording apparatus having a recording cycle apparatus, said apparatus including electrical means for moving a strip of record receiving medium past a recording point and an auxiliary mechanical record receiving medium moving means arranged to be operative during the period in which said first means accelerates to its normal operating speed,

electromagnetic means responsive to an occurrence of a condition to be recorded for initiating recording cycle apparatus for a predetermined time interval and initiating said auxiliary mechanical energy storage means efiective to move with high initial velocity and being arranged to be released upon occurrence of said condition to move a loop of said strip of record receiving medium past said recording point at an initial velocity comparable to the velocity of the record receiving medium as moved by said first mentioned means at its normal operating speed.

11. In an oscillograph for recording automatically the occurrence of a condition to be recorded including a record receiving medium driving motor normally maintained in an inoperative condition, a mechanical energy storage means, an auxiliary record receiving medium moving means arranged to be actuated by said mechanical energy storage means upon occurrence of said condition, said auxiliary means being arranged to operate for a relatively short time,

means responsive to occurrence of said condition for rendering operative said record receiving medium driving motor and said auxiliary means, and means correlating the movements of said "driving motor and said auxiliary record receiving medium movin means so as to move the record receiving medium past a recording point at a relatively constant rate of speed while said driving motor attains normal speed.

212 112. In an .oscillographic recording apparatus, normally inoperative means for moving a record receiving :medium past a recording point :for a predetermined time interval .upon the occurrence of a condition to be recorded, .an auxiliary record receiving medium moving apparatus including an energy slorage mechanism, said auxiliary record receiving medium moving apparatus being for subsequent actuation of said auxiliary record receiving medium moving apparatus during the next cycle of operation of the recording apparatus.

13. In an automatic 'oscillograph for recording certain conditions, the combination comprising an electrical record receiving medium moving means, an auxiliary mechanical record receiving medium moving means, mechanical energy storage means for actuating said auxiliary record receiving medium moving means, means responsive to the occurrence of a-condltion to be recorded to energize said record receiving medium moving means and to render operative said energy storage meansto actuate said auxiliary record receiving medium moving means, a recording point, means correlating the movements of both said record receiver moving means so as to move the record receiving medium at a relatively constant rate past said recording point during the acceleration period of said first means, and electrical means operable subsequent'to the operation of said first record receiving medium moving means for storing energy in said mechanical energy storage means for subsequent use.

CLAUDE M. HATHAWAY.

REFERENCES CITED The following references are of record in the file of this patent;

UNITED STATES PATENTS Number Name Date 610,782 W-ich Sept. 13, 1898 1,017,984 Martin Feb. 20, 19 2 1,196,335 C-lokey Aug. 29, 1916 1,545,078 I 1925 1,580,802 1926 1,684,309. 1928 1,779,324 1930 1,800,256 1931 1,817,432 Angus Aug. 4, 1931 1,871,379 Legg Aug. 9, 1932 1,883,907 Hathaway 1- Oct. 25, 1932 1,853,960 Cunningham 1,... Apr. 12, 1932 1,919,697 Thompson July 25, 1933 2,034,543 Twiss et a1. Mar. 17, 1936 2,059,879 La Pierre Nov. 3, 1936 2,126,775 Hodgson Aug. 16, 1938 2,202,731 Crago May 28, 1940 2,256,746- Mayer Sent. 23, 1941 2,262,520 Twiss Nov. 11, 1941 2,359,651 Krogh Oct. 3, 1944 2,467,008 Brown Apr. 12, 1949