US2091357A - Speed recording instrument - Google Patents

Description

Aug. 31, 1937. E L GOLDSMITH 2,091,357.

SPEED RECORDING INSTRUMENT FiledJuly 29, 1932 4 Sheets-Sheet 1 Aug. 31, 1937. E. 1.. GOLDSMITH 2.091357 SPEED RECORDING INS TRUMENT Filed July 29, 1952 4 Sheets-sheaf, 2

6M @yW v 47-May Aug. 31, 1937. E. 1.. GOLDSMITH ,0 3

SPEED RECORDING INSTRUMENT Filed July 29, 1932 4 Sheets-Sheet 3 ZWZ KW 1937- 5. L. GOLDSMITH 2,091,357

SPEED RECORDING INSTRUMENT Fi led July 29, 1932 4 Sheets-Sheet 4 lnooooooooo'floooodec OI Patented Aug. 31, 1937 UNITED STATES PATENT OFFICE 8 Claims.

My invention relates more particularly to that type of recording instruments which may be employed for recording conditions attending the travel of vehicles along a highway, and an object of my invention, among others, is the provision of an instrument of this type by means of which not only the number of vehicles passing along a certain section of the highway may be determined but the speed of such vehicles will be automatically denoted and each vehicle may also be positively identified.

One form of a recording instrument embodying my invention and in the construction and use of which the objects herein set out, as well as others, may be attained is illustrated in the accompanying drawings, in which- Figure 1 is a view in longitudinal section through a section of a roadway illustrating in a diagrammatical manner my improved apparatus installed relatively thereto, such apparatus being shown in section.

Figure 2 is a top view of the power unit.

Figure 3 is a view in elevation of the power unit with the motor removed.

Figure 4 is a view in elevation of the power unit looking from the right as shown in Figure 2 with a part of the motor broken off.

Figure 5 is a view in vertical section on a plane passing lengthwise through the axis of the actuating mechanism.

Figure 6 is a view in elevation looking from the left of the device as shown in Figure 3.

Figure '7 is a view in elevation of my improved apparatus embodying a modified construction, the recording frame being shown in vertical section.

Figure Bis a view in section on a plane denoted by the dotted line 8-8 of Figure 7.

Figure 9 is a top view illustrating another means for recording the conditions relating to travel.

Figure 10 is a view in elevation of the same looking from the right in the illustration in Figure 9.

Figure 11 is a detail view in section on a plane denoted by the dotted line ll-Il of Figure 9.

Figure 12 is a diagrammatic view on reduced scale illustrating the wiring of the device just referred to, parts being broken oif for clearness of illustration.

Figure 13 is a diagrammatic view illustrating in simplified form the actual conditions as to a" portion of the wiring shown in Figure 12.

Figure 14 is a similar view relating to the wir- 1 ing shown in Figure 1.

In the accompanying drawings the numeral l8 denotes a roadway having pits l-l--I2 spaced a certain distance apart and with traps |3l4 covering such pits, said traps being preferably hinged at one edge and with the other edge adapted to be raised as by means of a spring as shown in Figure 1. A starting apparatus is located in the pit II, as shown at the left in Figurel, and a stopping or resetting apparatus is located in the other pit I2, or that shown at the right in said Figure l. A starting switch lever l5 of insulating material is pivotally mounted on a support in the pit H and is connected by an actuating rod "5 with the trap l3 on one side of its pivot, its end on the opposite side of said pivot having a contact adapted to slide into engagement with a contact l1 on a movable terminal It also of insulating material pivotally mounted on the support herelnbefore mentioned. The terminal I 8 is held in contact with the end of the lever l5 as by means of a spring I! secured at one end to the terminal and at its opposite'end to an armature 28 of an electromagnet II also mounted on said support. The lever I5 is spring pressed out of engagement with the contact I1. The armature 28 has a notch for engagement with one end of the switch lever l5 to hold the same in engagement with the contact ll until released therefrom by electrical connections to be herelnafter described and operated from the resetting mechanism in the pit l2. This resetting mechanism is similar in construction to the starting apparatus just described and comprises in addition to the trap H a resetting switch lever 22 of insulating material having a contact thereon, actuator rod 23, contact 24 on a pivoted terminal 25, and a spring 28, the magnet with its armature being omitted. This resetting apparatus is electrically connected with the starting apparatus and with other parts of the structure in a manner to be hereinafter described.

A power unit is electrically connected with the starting and resetting apparatus hereinbefore mentioned, this unit comprising a controller shaft 21 rotatably mounted in bearings 28 at the upper ends of posts 29 rising from a base plate 38. A tubular "support is also mounted in the upper ends of said posts, as in ball bearings located in recesses in said posts, as shown in Figure 5 of the drawings. This support comprises a housing 3| for a sleeve 32 projecting from one end thereof with a plate 33 closing the chamber in the housing and having a hub received in one set of said ball bearings, the outer end of the sleeve 32 also being supported by another set of further and detailed description herein, but as shown in Figure 2 of the drawings.

An electromagnet 31 is secured within thehousing 3| to rotate therewith and the armature v 38 of said magnet is rigidly connected with the shaft 21 as by means of a block secured to the shaft and on which said armature is supported, as shown in Figure 5 of the drawings.

An indicator arm or exhibiting member 39 is l5 operatively connected with the shaft 21, said arm being loosely mounted upon a block secured -to said shaft and held in frictional driving contact therewith by means of a spring,. asshown in Figure 5. .The shaft is rotated backwardly as by means of a returning spring 40 having one end rigidly connected with the shaft and the opposite end secured to a bearing 28. A supporting plate 4| is secured to the base plate 30 and conductor rings 42-43 attached to an insulating plate 44 are supported by the plate 4|, a brush 45 being pivoted at the end of the arm 39 to movein contact with said rings.

The ring 42 is cut away as at 46, as shown in dotted lines in Figure 4, for a portion of its periphery, and the ring 43 has graduation marks bearing characters to denote speed. The arm 39 has a buffer plate 41 on the opposite side of its axis from the brush 45, .said plate bearing a spring buffer 48 adapted to strike a stop 49 pro jecting from one of the posts 29, and as shown in Figures 3 and 4 of the drawings.

An insulating bushing 50 is mounted on the sleeve 32 said bushing supporting conducting collars 5|52 from which conductors extend to 0 the opposite poles of the electromagnet 31. Brushes 53-54 extend from binding posts 55-56 secured to one of the supporting posts 29, and as toward the disk as by means of a spring in a box 50 59. The brake lever is held in releasing position by means of a lug on an armature 6| of a brake operating magnet 62 mounted on the base 30 and as shown in Figure 6 of the drawings. A camera or exhibiting device 63 is con- 55 ventionally illustrated in Figure 1 of the drawings, it being understood that said camera will be placed in position to receive the image of a vehicle passing along the road l0, said camera being electrically connected for operation in a 0 manner to be hereinafter described.

A battery 64 may be employed for supplying electric current to the several circuits. The starting circuit comprises wires denoted by the letter a extending from the positive pole of the 65 battery to the contact I! and continued therefrom through the contact on the switch lever I5 [to the binding post 56 and from thence to the electromagnet 31. The return wire of said circuit a is from said electromagnet to the binding post 55 and from said post to the negative pole of the battery.

A resetting circuit comprising wires 0 extends from the battery along the circuit (1 including the terminal l8 and the. lever l5 to a point be- 'yond the latter, andfrom said point by a wire a manner that will be readily understood without to a contact on the terminal 25, and from said contact to a contact on the lever 22, when the latter is in circuit closing position, and from thence to one pole of the resetting magnet 2|, and from said magnet to the negative pole of the battery. A speed indicating circuit e employs 1 the circuit 0 from the battery to a junction with the line 0 before its connection with the magnet 2|. From this point the circuit e leads to a magnet 63' for operating the camera 63 and from said magnet to and through the magnet 62, the conductor ring 42, the brush 45, when connecting the ring 42 with the ring 43, and

from said ring 43 to a junction with the circuit c and thence to the negative pole of the battery. In the operation of the device thus far described, if a vehicle is traveling at a certain rate, say over thirty miles. per hour, when said vehicle depresses thetrap 3 the lever l5 will be swung into engagement with the contact I? thereby closing the circuit a and will be held in this position by engagement with the armature 20. The magnet 31 being thereby excited its armature 38 will act as a clutch to connect the rotating housing 3| carrying the magnet 31 with the controller shaft 2'! thereby rotating the latter by the driving gear 34, and carrying with it the indicator or exhibiting arm 39 and the brush 45 mounted thereon, it being understood that the magnet is being continuously rotated by the action of the motor 35. With the apparatus arranged as illustrated herein the pits ||-|2 are located at such distance apart that if a vehicle be traveling over thirty miles per hour the brush 45 will continue in contact with both of the rings 42-43 thereby keeping the circuit closed at this point until after action of the trap l4.

When the vehicle depresses the trap M the resetting circuit c being closed by the lever 22 the current passes from the said lever along the return wire 0' to the magnet 2| and from said magnet to the negative pole of the battery. The

' magnet being energized the armature 20 is drawn from engagement with the lever l5 and the latter assumes its normal condition to break the circuit at this point.

The closing of the circuit by the lever 22 also establishes the circuit e through the magnet 63' for the camera 63 effecting its operation to take a picture of the vehicle passing in front of it. This also energizes the magnet 62 attracting its armature 6| and withdrawing the lug 60 from engagement with the brake lever' 58 and permitting the latter to act under the influence of the spring in the box 59. Pressure of the lever against the brake disk 51 stops the operation of the indicating apparatus and the location of the brush 45 with respect to the indicating marks on the index will denote the rate of travel of the vehicle.

vIt will be understood that the power unit may be located some distance from the traps |3|4, as alongside the roadway, and the apparatus thus far described being arranged to denote speeds above thirty miles an hour, as soon as a vehicle has passed over the trap I4, an attendant will reset the mechanism as by pulling down a cord 65 thereby releasing the brake lever 58 from the brake disk 51 and permitting the lug 60 to engage the lever and hold it in unbraking position.

If a vehicle should stop between the two traps, or if such vehicle should be traveling at a rate less than thirty miles an hour, no indication of speed will be made. The 0 ration of the trap l3 will start the mechanism as hereinbefore described, but before the vehicle reaches the trap l4, the brush 45 will have reached the cut away portion 46 of the conductor ring 42 so that the electric circuit will be broken at this point. In this event the plate 44 continues its rotation until the arm 39 contacts with a circuit closer 66 thereby completing the resetting circuit comprising the wires e which is broken at the trap I4, such completion taking place through wires 2' constituting a supplemental resetting circuit, one of said wires 1' leading from the positive side of the circuit to a terminal 61 and the other wire 1' leading from a terminal 68 to the opposite side of the circuit c. Said terminals being pressed into contact the circuit is completed through the positive side of the circuit 0 to the wire 1', terminal 61, terminal 68, wire i, to the negative side of the circuit 0, thence to the electromagnet 2| and therethrough to the negative pole of the battery. This energizing of the magnet 2| resets the device as hereinbefore described without a record having been made. In this operation it will be noted that the camera 63 and brake operating magnet 52 will not be operated owing to the fact that the circuit is broken at the rings 42 and 43.

It is evident that the cut-away portion 46 of the ring or disk 42 may be reduced or elongated to determine the taking of a picture at different speeds, or the ring or disk 42 may be adjustable on its axis to accomplish the same purpose and as shown by the slot and screw in Fig. 4 of the drawings.

The structure shown in Figures '7 and 8 is, so far as the operating mechanism is concerned, the same as hereinabove described. All that is changed is the recording mechanism which is substituted for that, hereinbefore described, this recording mechanism being designed to :make a record of every vehicle passing along the roadway lll. The braking mechanism is also omitted. A marking finger 69 is substituted for the indicator arm 39 said fingerbeing supplied with a marker 10 which may Help the form of a pencil or other marker. This marker operates in connection with a chart I l passing as from a supply roll 12 over a feed roll 13 along a vertically disposed table 14 for supporting the chart during recording operations, to a feed roll I5 and on to a receiving roll 16. The rolls 12 and 16 may be removably mounted as in the side parts of a recording frame 11. The chart or strip 'll may be perforated at its opposite edges to receive prongs from the rolls 13-15 to ensure even movement of the chart. For operating the feeding mechastate that the shaft of the motor has a sprocket 80 carrying a sprocket chain 8| which passes around sprockets on the shafts of the roll and a feeding roll 82 for driving the roll 16 by frictional contact therewith. A sprocket chain 83 extends from a sprocket on the roll 15 around a sprocket on the roll 13 for the purpose of driving the latter.

In place of the brush 45 described in connection with the device shown in Figures 1 to 6 a brush 84 is attached to the. buffer plate 41, being insulated therefrom and this brush connects contacts 85-86 projecting from a block on the base of the recording mechanism. These contacts have the same function as the rings 42-43 in the other structure, said contacts being included in the circuit comprising the wires e, and as illustrated diagrammatically in Figure 8.

In the operation of this form of recording mechanism when the trap I3 is depressed the operation of rotating theshaft 21 is the same as before, the electrical connections being the same. This swings the arm 69 toward the'left, as seen in Figure 8, and the chart H being moved by the clock mechanism the time of operation of the arm 69 will be denoted. Thegraduations 8'! with the lines extending therefrom will denote the speed of the vehicle, such speed being determined by the ends of the lines 88 made by the marker, the

movement of the arm 69 being stopped when the vehicle passes over the trap 14, in the manner hereinbefore described with respect to the device of the other figures.

Should the vehicle be traveling at a rate less than that provided for by the chart ll so that the finger 69 will reach the left hand edge of the chart before the vehicle passes the trap H, the base of the marking finger 69 will strike the terminal 61 pressing it into contact with the terminal 68, thereby completing the circuit comprising the wires 2' hereinbefore described and operating the magnet 2| to release its armature from the lever l5, thereby resetting the mechanism as hereinbefore explained with respect to the other device.

It will be noted that the brake operatingmechanism 62 having been dispensed with in this latter mechanism the magnet for the camera 53 is connected directly with the wire e (or c) extending from the levr 22. The mechanism just described will operate to take a picture by use of the camera only in case a vehicle is traveling at a prohibitive rate of speed which will be indi-' cated by'a termination of a line 88 before reaching the crosswise center line 89 shown in Figure 8. In case, however, it is desired to take a picture of every vehicle moving along the roadway, as will frequently be the case, the contacts 85-}6 will be long enough not to be disengaged from the brush 84 during the complete movements of the marking finger 69. It will be understood that in actual construction the lines included in the index l9 and those included in the index 81 will extend entirely across the sheet, intersecting each other, in a manner common to charts of this class.

In Figures 9 to 12 inclusive I have shown an arrangement of the recording mechanism which I have found to be extremely eiiicient and which, I might say, is the preferred construction. The general arrangement of the mechanism is the same as hereinbefore described, with the exception that thestarting and, stopping apparatus is arranged in the case containing the mechanism hereinbefore described and of which the base plate 30 comprises the back or bottom, said start ing and stopping apparatus being connected with the traps by wiring to be hereinafter described, said traps actuating push buttons or similar devices located in the pits H and I2 to be actuated by said traps. In this form of the mechanism a reciprocating slide is employed in place of the reciprocating indicating arm 39 and marking finger 69 shown in connection with the other devices.

'A pivotally mounted starting switch lever 90 is connected as by a link with an armature 92 of a starting magnet 93, which armature is spring pressed away from the magnet, as shown in Figure 11. The magnet is electrically connected in a manner to be hereinafter described with a push button or similar device 94 in the pit II, and the armature 92 is arranged to be held and released by the armature 20 of the resetting electromagnet 2|, as in the device shown in Figure 1, the lever 90 having one end bearing an insulated contact in sliding contact with the pivoted terminal I8 and the contact I! thereon, as in said Figure 1. It will be noted that in connection with this device I have applied the same characters used in the device of Figure 1 to designate members operating substantially in the same manner and having substantially the same functions as said members in Figure 1.

In the construction now being described the V speed recording apparatus comprises a recording slide 90 reciprocatingly movable on slide rods 01 projecting from an insulated block 98 secured to a U-shaped mount 99 fitting over the top of and supported by a box I00 secured to a frame IOI rising from the base 30' and including a supporting plate I02 and a bracket I03 projecting from the upper end of said .plate, and as shown in Figs. 9 and 10. The box I00 contains a motor in the form of a clock mechanism, which is of standard make. The mechanism is operatively connected with the driving shaft I04 of a timing set of rollers supporting a timing and recording Y sheet I05 preferably having its edges perforated I to receive spurs projecting from the driving roll to the shaft 21.

(not shown) secured to the shaft I04. Said rollers and sheet being of well known construction and operation a further and detailed description is omitted herein as their operation will be readily understood by those skilled in the art.

The outer ends of the rods 91 are loosely supported in insulated'bushings in fixtures I06 rotatably supported upon a fixed shaft I01 secured in the bracket I03, said shaft acting as a pivotal mount for the rods 91 and parts supported thereon, so that the mount 99, the block 90 and the slide 96 with parts located thereon may'be lifted to permit ready change of sheets I05 when required. A post I08 secured to and rising from the slide 96 acts as an anchorage for one end of a flexible actuator I09 secured to the post as by means of a. clip and as shown in Figure 10 of the drawings, said actuator passing around a roller IIO, rotatably mounted on the shaft I01, and having its opposite end secured to a disk I II fixed Another disk II2 secured to said shaft has another section II3 of said actuator secured thereto said section passing upwardly and around a roller I I4 loosely mounted on the shaft I0'I. In order to enable the section II3 of the flexible actuator to be given a quarter turn a block H5 is employed to. which the adjacent ends of the actuator are secured, and as shown in Figure 9 of the drawings. This enables the actuator to be passed around a roller IIB mounted on a stud shaft rising from the mount 99 and as shown in Figure 10, this end of the actuator.

II3 being secured to-a clip fastened to a tubular post III rigidly fixed to the slide 96.

I The actuator I09 passes on to the disk III at I I l one side, as shown in Fig. 10, and the actuator II3 passes on to the disk H2 at the opposite side, the two actuators thus being wrapped in opposite directions about the disks, so that one actuator is being wound on its diskwhile the other actuator is being unwound. The disks turning in the direction indicated by the arrow in Fig. 10, the actuator I09 is wound upon the disk, exerting a pull on the slide 96 and at the same time the actuator H3 is unwound, thus yielding to permit movement of said slide toward the right as viewed in Figs. 9 and 10. t a

A marker in the form of a prick point H8 is mounted for vertical sliding movement in the tubular post I I1, said marker being spring pressed upwardly. Its upper end is engaged by an adjustable screw mounted in the armature II9 of a recording magnet I secured to the slide 96, said armature being pivotally mounted in the upper end of the post I08, and as shown in Figure 10 of the drawings.

In the operation of the mechanism just described the shaft 2'! is rotated in one direction by the operation of the clutch in-the housing 3| in the manner described with respect to the apparatusv shown in Figs. 1 to 6, said clutch being released under certain conditionsand the shaft 21 being returned to its normal position by means of the spring 40. When the clutch is thrown into operation andthe shaft 21 is rotated the disk III traveling in the direction of the arrow shown in Figure 10 will move the carriage 06 and the parts carried thereby to the right along the rods 91, the disk II2 permitting movement of the section I I3 of the actuator in one direction to allow such movement. The slide 96 will move to an extent determined by the speed of the vehicle traveling along the roadway I0, and when the trap I4 is operated the clutch will be released in the manner hereinbefore described and the spring 40 will return the parts to the position shown in Figure 10. At the time of operation of the trap I4 the magnet I20 will be energized, in a manner to be hereinafter described, the armature III! will be drawn to the magnet and the prick point or marker IIB will punch the sheet I05 at the point f reached by said marker at the timethe trap I4 is operated. The sheet I05 will bemarked with graduations and lines as shown in Figure 8 so that not only the time will be recorded, but the speed of the vehicle will also be recorded. These marks are omitted from Figure 10 of the drawings as they will be sufliciently understood by the showing made in Figure 8.

A register I2I is supported on the 'base 30, as shown in Figure 10 of the drawings, this register comprising a counter of ordinary form and construction together with electrical means for operating it, said means comprising a core I22 and a coil I23 which operate actuating mechanism I24. This counter with the actuating mechanism including the electrical means is of the ordinary and standard make and may be purchased upon the market, and therefore a. further and detailed description is omitted herein,

as the construction and operation will be readily understood by those skilled in the art.

The coil I23 for the registerand' the magnet I20 for actuating the marker II8 are included in the circuit e, as shown in Figures 12 and 13, the camera 03 with its switch comprising the rings 42-43, the register I2I and the marker IIB being in multiple, as shown particularly in Figure 13, except in the arrangement shown in Figure 12 the wire from the camera to the negative pole of the battery is separate from the return wire from the register and marker to the battery. It

- will be noted that in the arrangement shown in Figure 12 the slide rods 91 constitute a part of the e circuit.

As hereinbefore explained the starting magnet 93 and its armature 92 are substituted for the rod l6 in Figure 1 as a means for actuating the switch lever 96 which is the equivalent of the switch lever l5 shown in Figure 1, all of this mechanism in the device of Figures 9 to 13 being located in the enclosing casing, as hereinbefore mentioned.

In order to initiate the starting operation of this latter form of mechanism I employ an initiating circuit comprising wires-n extending from the positive .pole of the battery through the push button 94 and to the starting magnet 93, and through said magnet to a junction with the circuit 0 as shown in Figure 12. This completes the n circuit to the negative pole of the battery.

The motor 36 and the clock mechanism in the box I00 may be connected with a separate circuit I25 extending from any suitable source of power.

When arranged for operation the switches to the motor and the clock mechanism within the box I06 will be closed and said devices will therefore be in operation, thereby rotating the housing II with parts therein and also moving the sheet I05. As to the other switches they are all open at the starting ofan operation. When the trap I3 is depressed, as by a vehicle passing over it, the switch comprising the push button 94 is closed, thereby energizing'the magnet 93 through the circuit n. This operates'the armature 92, thereby swinging the switch lever 90 to close the switch comprising the contacts I! and 95. This puts the circuit a into operation to energize the magnet 31 and operates the clutch comprising the armature 36, as hereinbefore described to rotate the shaft 21 and the disks II I and H2 secured thereto. The actuators being wound in opposite 40 directions upon said disks this operation effects a pull upon the flexible actuator I09 and slackens the section H3 of said actuator, thereby moving the slide 96 and parts thereon toward the right as viewed in Figure 10 as hereinbefore set out, The

45 starting switch remains closed during this interval. This mechanism is reset by rotation of the shaft 21 to its position of rest by the spring 46, the actuators operating reversely to the manner above explained.

50 When the trap H is depressed, as by the weight of a passing vehicle, the switch comprising the push button in the pit l2 will be closed, thereby establishing the c circuit and energizing the magnet H to operate the armature 20 and release 55 the switch lever 90, thereby resetting the starting switch mechanism. The e circuit is also established simultaneously with the c circuit, thereby operating the register or counter l2| to register the event of a passing vehicle. This establishment of the e circuit also energizes the magnet I20, causing the marker H8 to operate to perforate the sheet I05 at the point reached by said marker in the movement of the slide 96.

If the vehicle is traveling fast enough the cam-- era will also be operated at this time in the manner hereinbefore described with respect to the mechanism of Figures 1 to 6. If the vehicle be traveling not to exceed a certain speed the switch comprising the rings 62 and 43 will be opened,

70 thereby rendering. the camera inoperative, and

the switch 66 will be operated in the manner hereinbefore described to reset the mechanism.

This resetting operation will also take place in the event that the vehicle does not reach the second trap or otherwise fails to pass over it.

When the resetting magnet is operated as hereinbefore described, the circuit a will be opened, thereby releasing the clutch 38 and the shaft 21 will be returned to its normal position by the spring 46, and this will also effect a return of the slide 96 to its normal position ready for a succeeding operation.

I claim:

1. A recording instrument including a rotatable support, a drive member mounted on said support and rotatable with respect to said support, means for coupling said support to said drive member, an exhibiting member driven by said support, a control member biased to one position and actuable to a second position, means effective to latch said control member in said second position upon such actuation, means responsive to such actuation for rendering the coupling means effective to couple the drive member to the support, a stop means, and means responsive to op' eration of the stop means to release said latch means.

2. A recording instrument including a rotatable support, a drive member mounted on said support and rotatable with respect to said support, means for coupling said support to said drive member, an exhibiting member driven by said support, a member biased to one position and actuable to a second position, means effective to latch said member in said second position upon such actuation, means responsive to such actuation for rendering the coupling means efiective to couple the drive member and the support, a stop means, means responsive to operation of said stop means to release said coupling means, and a movably mounted recording sheet supported in cooperative relation with respect to said exhibiting member.

3. A recording instrument including a movable support, a drive member mounted on said support and movable with respect to said support, means for coupling said support to said drive member, a slidably mounted recording member operatively connected with said support, said recording member including a perforating device, an electric circuit including a member for operating said perforating device, means to control continuity of said circuit, a movable starting control member, and means for operatively connecting said starting control member and said coupling means to effect operation of the latter to operatively connect said drive member and movable support.

4. A recording instrument including a movable support, a drive member mounted on said support and movable with respect to said support, means for coupling said support to said drive member, a slidably mounted exhibiting mechanism operatively connected with said support and including a perforating member and elect'romagnetic means for actuating said perforating member, a plurality of interconnected electric circuits, said magnetic means being connected in one of said circuits for operation by electrical current therein, means to control a break in said circuits, said means including a movable starting control member biased to one position and actuable to a second position, means effective to latch said control member in said second position upon such actuation, means for releasing said control member, means included in one of said circuits for electrically operatively connecting said control member and said coupling means and responsive to said actuation to couple the drive member to the support, and means for operating said control member.

5. In a recording instrument having a time driven chart and a marker, the combination of a rotatably mounted support carrying the marker, a time driven member rotatably'mounted on said support, electromagnetic means operative to connect the support to the member, a circuit for energizing said electromagnetic means, starting means operative to close said circuit, latching means operative to keep said starting means in closed position, stopping means operative to release said latching means and alternative means for unlatching said starting means operative by the stylus support after said support has rotated to a predetermined position.

6. A recording instrument including a drive member, an exhibiting member, an actuable start control means, means retaining said start control means in actuated position, means for resetting said start control means to unactuated position, means responsive to actuation of said start control means for coupling the exhibiting member to the drive member, an exhibiting device, electrical operating means for said exhibiting device, a circuit for said operating means, means driven conjointly .with the exhibiting member for conditioning the circuit to said operating means during a predetermined portion of the drive of the exhibiting device, stop control means, means magnetic clutch and an exhibiting structure drivable by said clutch when said clutch is energized, a circuit for energizing said clutch completed upon actuation of said start control member, a stop control member, means for releasing said latch, and means responsive to actuation of said stop control member for actuating said latch release means.

8. A recording instrument as set forth in claim 7, wherein the start control member includes a switch closed in the second position of the start control member and wherein the stop control member includes a switch closed when said stop control member is actuated, a pair of conducting members, one of which is of a predetermined length, bridgingmeans for said conducting members driven by said exhibiting structure, a camera, and camera operating means included in a circuit containing in series one of said conducting members, said bridging member, the other of said conducting members, said start control switch and said stop control switch.

EDWARD L'. GOLDSMITH.

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