Abstract: A refrigeration system provided with a rotary compressor, a refrigeration pipe line system connected with the compressor and having a gas-liquid separator for separating an injection pressure gas refrigerant, and a gas injection channel extending from a gas zone of the separator and having an open-close valve. The compressor is provided at its cylinder block with an injection pressure port opening to a pumping chamber and with a valve chamber communicating with the port. A by-pass passage channel communicating with the suction port side of the chamber extends from the valve chamber, and a control valve having a communication aperture and a spring, are housed within the valve chamber, the injection channel is connected with a back chamber of the control valve within the valve chamber, so that the open-close valve may be operated to control a capacity of the refrigeration system.

Abstract: An ice cube forming tray for an ice making machine consisting of a plurality of side-by-side corrugated plates having alternating ridges and grooves, straight plates separating the corrugated plates and also providing outer borders to the corrugated plates, and triangular evaporator coils located in complementary mating engagement in the apices of the ridges and passing through complementary mating openings in the plates. The plates which are not corrugated, instead of being straight, may be of hollow diamond-shape to also carry refrigerant.

Abstract: A refrigeration installation method and system for transportable containers. The refrigeration system comprising at least one refrigeration panel readily attachable to the interior walls of the refrigerated compartment of a truck, rail car, trailer, or shipping container. Each panel includes a heat transfer member that also acts as a protective liner which forms the exterior surface of each panel. The liner protects a layer of insulation, which has its inner surface bonded to the interior surface of the liner, from contact with the goods transported within the refrigerated compartment. The layer of insulation insulates and protects a refrigeration coil which is also affixed to or is made part of the interior surface of the liner. The outer surface of the layer of insulation is placed in contact with the interior walls of the refrigerated compartment.

Abstract: A portable cooler enclosure comprising a hollow base member having thermal insulating properties and defined by a continuous side wall, a bottom wall and an open top end. A lid is engageable over the open top end and also has thermal insulating properties. A cooling container is disposable in the base member for cooling air therein. The cooling container has a continuous outer and inner side wall. An inner cooling well is defined intermediate the inner side wall for receiving one or more beverage containers therein. One or more cooling compartments are provided in the base member adjacent the outer wall of the cooling container.

Abstract: A portable beverage cooler comprising a hollow body having a bottom wall, opposed side walls and an open end. A lid is provided for closing the open end. The hollow body and the lid are each formed of a material having thermal insulating properties. Engagement means is provided in opposed ones of a pair of the side walls of the hollow body for vertically supporting a coolant container spaced adjacent a respective one of the other two opposed side walls and in an upper portion of the body above the bottom wall whereby a plurality of beverage containers may be placed in a lower level portion of the body with the coolant containers held thereabove and defining between them an upper level portion for containment of further beverage containers resting on the containers in the lower level portion.

Abstract: Thermal coupling structure 40 has a tubular collar 42 which embraces the cold end of cold finger 14. Fingers 44 on collar 42 resiliently engage within inner wall 24 of dewar 22 so that heat is conducted from device 32 to be cooled through this inner wall 24 to fingers 44, collar 42 to cold finger 16.

Abstract: A cooling device has a flexible foam insulating layer with a cooling surface. A plurality of distinct cavities spaced from each other are located adjacent the cooling surface in the insulating layer. A cooling fluid is contained within each cavity. The device is cooled to freeze the cooling fluid, and an object such as a bottle is placed within the cooling device to be cooled.

Abstract: A coupling for mandrels in winding machines wherein the mandrel has a square end portion receivable in a complementary cavity which is machined into a socket rotating with a shaft which drives the mandrel in a direction to collect or to pay out a web of flexible material. The socket has a hand wheel which is movable between operative and inoperative positions and the remaining part of the socket carries one or more cushions in the form of pads and/or pins which are urged against the end portion of the mandrel when the hand wheel is moved to the operative position. Additional cushions can be provided on the hand wheel. The mandrel and the socket are further provided with cooperating centering elements for the mandrel. The cushion or cushions prevent wobbling of the mandrel and reduce noise when the mandrel is driven by the shaft.

Abstract: A coupling for two co-axial torque transmitting shafts having the features of a splined torque transmitting joint (5, 6), a screwed joint (9, 10) for effecting axial engagement of the splined joint, interference members (15, 16) axially movable to a locked position in which unscrewing of the screwed joint is prevented, and a detent (32, 33) for preventing axial movement of the interference members from the locked position, the whole being housed in a readily hand grippable housing 19, hand movement of which effects sequential operation of all the features.

Abstract: An overload clutch is described which includes a drive member and a driven member which are coaxial and have concentric cylindrical surfaces which form an annular chamber. One or more rollers of elastomeric material are positioned in the chamber with the rollers in rolling contact with the concentric cylindrical surfaces. Teeth project into the annular chamber from both surfaces and engage the rollers from diametrically opposite positions to transmit torque from the drive to the driven member. Excessive torque causes the rollers to compress between the two engaging teeth, the roller passing between the teeth and allowing the drive member to rotate relative to the driven member.

Abstract: A thread control device of a weft knitting machine comprises a thread guide, which is fastened to a weft rod. The weft rod is mounted to be pivotable about its longitudinal axis and to be axially displaceable in supports, which in turn are movable at right angles to the axis. The weft rod is connected to be secure against rotation with a non-axially displaceable crank. A non-rotatable drive transfer member is reciprocatingly displaceable in a plane parallel to the axis by, for example, a pivot arm. A thrust member is articulated by ball joints to the crank and to the transfer member and in operation converts reciprocating motion of the transfer member into oscillatory pivotation of the crank. Such a thread control device makes high operating speeds possible and enables production of tapes with complicated patterns.

Abstract: A cleaning method for steel plates is disclosed for removing rolling oil and metal powders by spraying highly pressurized cleaning solution on both surfaces of strip steel plates immediately before and/or after the final step in the cold-rolling process of the strip steel plates. The cleaning may be performed with efficiency by mixing abrasive grains, a rust inhibitor, a surface active agent or the like in the cleaning solution.

Abstract: The present invention is a process wherein: the process includes a method during slabbing, in which, recesses in the thicknesswise direction are formed on a pair of opposite surfaces at each end of the top and bottom of said steel ingot, subsequently, the central portions which have not been rolled, are rolled to the depth of said recesses, then, recesses in the widthwise direction are formed at the same end as described above, next, the central portions, which have not been rolled, are rolled to the depth of said recess in the widthwise direction; and, when the thicknesswise reduction value is .DELTA.H.sub.T and the widthwise reduction value is .DELTA.H.sub.W in said thicknesswise and widthwise reduction rollings, .DELTA.H.sub.W /.DELTA.Ht is regulated to 0.40.about.0.65 in a region where the material has a comparatively large thickness and the side profile of the material presents a double barrelling, and .DELTA.H.sub.W /.DELTA.H.sub.T is regulated to 0.

Abstract: A method for multiple pass rolling of railroad-rails in a universal rolling mill having horizontal rolls and vertical rolls, comprising measuring the axial displacement of the horizontal rolls and the radial displacement of the vertical rolls when a blank passes through a roll caliber defined by the horizontal and vertical rolls. The measurements include the relation of the displacement of the horizontal and vertical rolls and the difference of the rolling forces acting on the rolls each of the two vertical rolls. The values of the rolling forces of the vertical rolls during the intented passes, can be calculated, by arithmetic operations, independently of the above mentioned measuring so as to estimate the axial displacements of the horizontal rolls and radial displacements of the vertical rolls before the rolling by consequent pass is actually performed.

Abstract: A riveter comprises a turnable jaw case is disclosed. A jaw case tubular housing (170) is turnably supported by the forward end portion of the frame main body (101,) and lockable in a plurality of positions angularly spaced from each other. The orientation of the jaw case housing is easily changeable in accordance with the shape of the work to be riveted or with other conditions, so that rivets are settable very efficiently with only one riveter for any work irrespective of its shape.

Abstract: An adjustable cam arrangement is provided for controlling various work handling elements of a multistage press. Releasable cam disc members are mounted on a camshaft for actuating a respective cam follower associated with a work handling element. The cam disc members are drivingly coupled to the camshaft in response to a supply of fluid pressure. The cam disc members contain a pair of cam discs adjustable by a motor for independently rotating the cam discs relative to the camshaft for varying the duration and timing of work handling elements.

Abstract: A hydropunch comprises a cylinder, with one end thereof facing the working surface of a die intended for positioning thereon a workpiece to be treated. Accommodated inside the cylinder and forming an above-the-ram chamber and a below-the-ram chamber is a ram which is actuated by means of a suitable actuator mounted on that end of the cylinder which is opposite to the aforementioned end thereof, the ram being connected with a system for returning the ram to its original position. In addition, the hydropunch includes a compressed gas receiver communicating with the above-the-ram chamber of the cylinder, and a cover adapted for closing both the cylinder and receiver. In accordance with the invention, the system for returning the ram to its original position comprises a closed chamber communicating with the below-the-ram chamber of the cylinder, and a value intended for communicating the above-the-ram chamber with the atmosphere.

Abstract: In combination with a treadway upon which a vehicle, whose structure is to be realigned, is positioned, an improved alignment apparatus interconnecting the treadway and a selected portion of the vehicle structure. The alignment apparatus has a base assembly having a horizontal leg with a vertical member attached thereto, and a clamping assembly secured to the vertical member for attachment to the vehicle structure. The horizontal leg is adapted to rest on the treadway and is interconnected to a plurality of spaced openings in the treadway. The alignment apparatus may be rigidly secured to the treadway, or may slide across the treadway in response to a pulling force applied either to the vehicle or the alignment apparatus all while supporting the vehicle structure.

Abstract: Natural diamonds can be distinguished from simulated diamonds in seconds by merely touching a hand held probe to the gems. The tip of the probe includes a rounded gem contacting head of high thermal conductivity and low thermal mass. The head is preferably of gold-coated copper. It is supported on a high thermal resistivity neck extending from a large spring biased thermal mass. The head supports a thermistor heater element and a thermistor temperature sensing element within an annular space. Pulses of power are cyclically applied to the heater element to produce a predetermined amount of heat flow from the probe through the sample gem. The resulting change in temperature of the contacting head is determined by sensing the change in resistance of the sensing thermistor and weighting that change by the sensed thermistor resistance. The weighting function is carried out by a gain-controlled amplifier.

Abstract: The apparatus comprises a chamber having an open end and an opposite closeable end, and provided with a heating device and pressure measuring device. The open end of the chamber is inserted into the fresh concrete with opposite end opened. After insertion the chamber is closed and the contents heated under predetermined conditions. The pressure increase is a function of air content of the mixture.

Abstract: An air-fuel ratio detecting system is designed to compensate for the effects of temperature changes on the output resistance of an air-fuel ratio sensor adapted to detect the air-fuel ratio of mixture supplied to an engine from the composition of its exhaust gases so as to vary its electric resistance in accordance with the air-fuel ratio. The system further includes a current control circuit for controlling the current supplied to the air-fuel ratio sensor, an average voltage detecting circuit for detecting a rich air-fuel ratio peak voltage and a lean air-fuel ratio peak voltage and obtaining the intermediate voltage therebetween, a bias control circuit responsive to the value of the intermediate voltage so as to adjust the current control amount of the current control circuit, and a comparator responsive to the junction point voltage and the value of the intermediate voltage so as to generate an air-fuel ratio detection signal.

Abstract: An apparatus for detecting undesirable combustion characteristics in spark-ignited internal combustion engines. A sensor and band-pass filter tuned to the frequency of the knock vibration are provided with an output of the band-pass filter being compared with a reference value. The result of the comparison is correlated with undesirable combustion characteristics to be recognized. A rectifier is provided for solid borne sound signals received by the sensor with the signals passing through the band-pass filter. The signal is rectified in the rectifier to a knock signal and a series circuit composed of a band-stop filter tuned to the frequency of the knock vibration, an r.m.s. rectifier, and an amplifier is provided by means of which the sound signal received by the sensor is converted into a reference signal. A comparator is provided when the reference signal and the knock signals are compared and an output signal is generated if the knock signal exceeds the reference signal.

Abstract: Methods for testing the sealing integrity of seals of joints being added to an underwater pipe string and of each previously laid joint in the pipe string each time a joint is added to the string. The seal testing methods can be accomplished in two ways; dynamically, by pumping the sealed pipe until flow stops if the seal is perfect; or statically, by sealing the pumping unit discharge and measuring the pressure in the sealed pipe.

Abstract: A crack indicator based on a piping system consisting of cold-embrittling plastics pipes imbedded in a gas container insulation. A warning gas is subjected to an excess pressure in the piping system. In the event of a crack or other damage to the insulating material, a leak is produced in the piping system at this point so that warning gas flows out into the tank interior. In this case, an indicator responding to the issuing warning gas produces an alarm signal. The alarm emitter can consist, for example, of an analysis instrument for the specific gas. However, an indicator based on a pressure measuring system which is connected upstream of the piping system and produces an alarm signal when a predetermined pressure difference is exceeded is simpler.

Abstract: An apparatus and method is disclosed for experimental displacement of liquids in slurries for measuring filtration rate, washing performance and displacement bleaching in pulp. An open top cylinder is movable to a vertical orientation and has a piston slidably positioned therein. The piston includes a porous face with communicating passages to its rear surface. Apparatus are provided for registering pressure in the cylinder as well as for providing regulated motion of the piston. Also, a valve is provided for admitting wash water to the lower part of the cylinder for back washing the filter cake.

Abstract: A device for air flow rate measurement in the air intake tube of an internal combustion engine which has at least two temperature-dependent resistors in different branches of a bridge circuit having closed-loop electric current control, and which is characterized in that the temperature-dependent resistors are embodied as hot wires, that a temperature above the aspirated air temperature is selected for both hot wires, and that the difference of the hot wire temperatures is held to a constant value. The purpose of the device is to provide air flow rate measurement which is as error-free as possible, even when the aspirated air temperature is fluctuating rapidly. An identically embodied suspension and fastening of the individual hot wires is given as an example for the spatial disposition of the individual hot wires in the air intake tube.

Abstract: A tool (40) for selectively adjusting the relative angular positions of a fuel pump camshaft (14) and an engine main shaft to minimize the effects of gear lash and thereby optimize fuel pump timing, including a hollow first shaft (50) which is adapted to rotate with a driven gear (36) rotatably received on a tapered sleeve (26) fixed to the camshaft (14), and a second shaft (66) coaxial with and reciprocably and rotatably received within the first shaft (50) and adapted to be coupled to the camshaft (14) for rotation therewith. The second shaft (66) is coupled through a planetary gear arrangement (90-94, 97-104) to the first shaft for rotation of the main shaft. Structure is provided for adjusting the relative angular positions of the first and second shafts (50,66) and for axially translating the first shaft (50) to lock the driven camshaft gear (36) on the tapered sleeve (26).

Abstract: The flat belt tire tester which permits mounting a wheel and tire to be tested about an axis positioned above a flat belt, and has framework and controls for lowering the tire into contact with the belt under desired loads, using desired adjustments for camber and steering. The belt is powered, and can thus be used for testing the tire under simulated road conditions. The mounting framework and belt mounting construction of the present invention provides substantial rigidity through having the mounting frame geometry properly oriented in relation to the contact surface of the belt and also by providing a stiff frame for the belt mounting drums or pulleys.

Abstract: A mechanism for setting slip and/or camber angles in a tire testing machine having a rotating wheel to serve as a substitutional road, the angle setting mechanism including: a support shaft adapted to support a tire at the center thereof for contact with the rotating wheel a swingable linkage provided between the tire support shaft and a movable frame of the testing machine and essentially constituted by four trapezoidally connected link levers having a pair of outwardly converging side link levers, an outer link lever having the opposite ends thereof pivotally connected to the outer converging ends of the side link levers and centrally fixed to the inner end of the tire support shaft, and an inner link lever having the opposite ends thereof pivotally connected to the inner ends of the side link levers and fixedly supported on the movable frame of the testing machine; and a mechanism for swinging the outer link lever back and forth in a direction substantially parallel to the surface of the movable frame to t

Abstract: This disclosure is directed to techniques for proof testing a laminated ceramic capacitor chip (10) by placing the capacitor on a planar base (26) and applying a load thereto in a direction perpendicular to the laminations. The load is applied by a compliant ram (27) and acoustic emissions emanating from the capacitor (10) pass through the ram to a transducer (28) mounted thereon. The acoustic emissions are converted to electrical signals by the transducer (28) and are forwarded to processing circuitry (29) to compare the acoustic emission signals to previously developed signals from stressed physically acceptable capacitors (10) to determine the acceptability thereof.

Abstract: An electronic scanning ultrasonic diagnostic system comprising a probe having ultrasonic beam emitting surface, in which plural ultrasonic wave transducers are convexly arranged at equal distances, emitting desired sector scanning ultrasonic beams, a transmitting and receiving wave control circuit dividing transducers into optional and plural groups and repeatedly performing of transmitting and receiving action with ultrasonic directivities respectively different to each group, and supplying ultrasonic beam scanning signals to an image display section with an assumption that the respective extension lines of each sector scanning ultrasonic beams coincide with the center of the arc shape of the probe.

Abstract: A frequency detector for detecting the frequency of vibration of an apparatus is disclosed having a first vibration sensor for providing a first output having a first frequency response to the vibration, a second vibration sensor for providing a second output having a second frequency response to the vibration where the first and second frequency responses envelope the desired frequency of vibration for the apparatus, a difference sensor connected to the first and second vibration sensors for providing a third output dependent upon the difference between the first and second outputs, and a load which is responsive to the third output.

Abstract: A sewer flow measurement system for determining flow conditions of a sewer line system wherein separately located monitors make and record precisely synchronized and time identified pressure measurements, utilizing pressure-to-signal transducers positioned on the bottom of pipes where they exit into manholes. A cassette recorder records the different pressure related signals from the monitors together with a discrete identification signal from each monitor. The outputs of the recorder are then fed to a pressure-to-flow computer which provides location identified, time synchronized, flow data for the system.

Abstract: A sensor for providing a differential pressure signal indicative of the average relative rate of flow of a fluid through a duct. Two tubular members are provided, each of which are formed in a loop oriented transverse to the fluid flow and each having a plurality of spaced-apart orifices along their length. In one of the tubular members, the orifices face upstream toward the impinging fluid flow; in the other, the orifices face downstream. The difference between the pressures developed within the two tubular members as a result of the orientation of these orifices relative to fluid flow is indicative of the average rate of fluid flow in the duct.

Abstract: A fluid flow meter comprised of a body portion having a passage therein for the fluid to flow therethrough, a movable member provided in the passage and adapted to be tiltable to open or close throttling of the passage corresponding to the flow rate of the fluid flowing through the passage, a spiral spring biasing the movable member constantly in the direction of throttling the passage, an amorphous magnetic member fixed to the movable member and provided with coils wound thereon, and a solenoid wound on the body portion to generate magnetic flux that is substantially parallel to the direction of fluid flow.

Abstract: A drive to reciprocate a vertical support member such as a shaft includes a journal support assembly which carries a lower end of the shaft while allowing rotational movement of the shaft. Located above the support assembly and attached to the vertical member is a reciprocation arm having a cam guide attached to its outer end. A cam assembly including an eccentrically offset cam bearing is disposed within the cam guide. The cam assembly is operatively connected to a source of rotary power which when energized reciprocates the support member in a selective oscillating cycle.

Abstract: An infinitely variable or stepless mechanical speed changing mechanism for transforming a rotary output shaft speed of lower or higher speed than the input speed and respectively higher or lower output torque than the driving input torque. Interleaved stacks of relatively thin flexible laminates are keyed to the respective shafts with some freedom of interleaving accomodation and developing the required tangential tractive effort in the planes of the laminations by means of substantially dry non-viscous Coulomb friction forces due to the loading forces applied normal to the planes of the laminations on the stack ends in a direction to pinch together the interleaved laminations, and with said normal loading forces applied to the outer laminations in either input or output stacks, or in both, by means of loading ball-bearing like wheels whose convex outer surfaces roll with substantially no slip on said outer laminations.

Abstract: A gear-shift mechanism for a motor vehicle having a change-speed transmission equipped with a speed-range selection device. The mechanism has a multi-speed gear-shift transmission unit and a range-shift transmission unit. The mechanism incorporates a shift control level whose movement can be transferred via a gear-selector passage and via several gear-shift passages to a gear-shaft which is supported in a rotating manner and can be axially moved inside a housing. The shaft loosely supports gear shifting levers which can be engaged on the shaft and locked in position in a non-revolving manner after an axial movement of the gear-shift shaft caused by the respective gear-selecting operations of the shift-control lever.

Abstract: A power distributing device for four-wheel-drive vehicle including an input shaft, a first output shaft for transmitting power to rear wheels, a second output shaft for transmitting power to front wheels, a plane planetary gear set, a power train changing means and a synchronizing means. The plane planetary gear set includes a sun gear having a hollow shaft, a ring gear connected with the first output shaft, a planet carrier drivably connected with the input shaft, and planet gears carried by the planet carrier and engaged with the sun gear and the ring gear.

Abstract: A power transmission mechanism for a gas turbine engine driveline comprising a geared differential and planetary gear system adapted to receive the output power of a single shaft turbine rotor and to effect a high speed reduction and a split torque delivery path whereby a portion of the driving torque is distributed to a multiple ratio transmission mechanism through a direct mechanical path and the balance of the torque is distributed through a traction drive unit with infinitely variable ratio characteristics.

Abstract: A reduction and reversing gear for marine propulsion systems making use of the clutch case of a conventional reduction and reversing gear of a type having an input shaft mounted on an upper part of the clutch case, an output shaft extending in parallel with the input shaft and mounted on a lower part of the clutch case, a multiple disc clutch carried by the input shaft, a small gear rotatably carried by the input shaft and adapted to be connected to and disconnected from the latter by the multiple disc clutch, and a large gear carried by the output shaft and engaging the small gear. A planetary gear type reduction gear is disposed in the space around the output shaft and below the multiple disc clutch to make an efficient use of that space, thereby to provide an additional reduction stage between the large gear and the output shaft.

Abstract: A pressurized fluid-operated power transmission device, is typically shown being shaft driven from an automotive engine as the drive for the compressor of a cooler and a fan is provided with a centrifugal governor and valving for limiting output rotational speed of the power transmission device. In one embodiment a noise-preventing back-flow check valve is provided.

Abstract: A modified crescent wrench in which the adjustment and holding mechanism may be quickly engaged or disengaged. The spiral adjustment cylinder is mounted over an eccentric mandrel which is rotated about its own axis to engage or disengage the spiral cylinder with the moveable jaw of the wrench.

Abstract: A socket wrench includes a squares solid rod which non-rotatably interfits within the squared bore of a sleeve. The squared rod has an enlarged head in which a driver releaseably seats. Both the rod and the sleeve are provided with a solid end of squared or other shape to which the attachment end of each of a series of differently sized sockets releaseably catches; and the squared rod includes a spring-biased ball detent which releaseably locks the squared rod to the receiving sleeve in its adjusted position.

Abstract: A method particularly applicable to the slicing of friable meat products with a rotaty cutting blade comprises feeding the product forwardly when it is not in contact with the cutting blade, and arresting the feeding when the slicing is taking place, and apparatus therefor. Provision is made to make the first slice of a stack somewhat thicker than the remaining slices in order to act as a carrier for the stack.

Abstract: A method of producing washers and the like from a strip of sheet material having at least one straight edge, in which scrap generation is minimized.

Abstract: An entirely digital polyphonic musical synthesizer in which the amplitude of each spectral component may develop either linearly or logarithmically as a function of time, including amplitude computation means which produce, for each period of an amplitude clock signal, a new current amplitude value by linear or logarithmic interpolation between the initial current amplitude and a predetermined final amplitude value. The new current amplitude value is memorized in place of the initial value. When the current amplitude is equal to the final amplitude, a signal is transmitted to the synthesizer control means. The synthesizer enables gentle modulations in amplitude to be obtained and reduces the complexity of the instrument's control means.

Abstract: An electronic musical instrument comprises a keyboard, a tone signal forming circuit to produce musical tone signals corresponding to keys being depressed on the keyboard, a memory to store musical performance data, a keyboard display device to visually instruct a pupil or trainee as to which keys are to be depressed on the keyboard in accordance with the performance data read out of the memory so that the pupil or trainee may effect a musical performance on the keyboard while following key indications, and an automatic musical performance device to effect an automatic musical performance of different type from the musical performance effected on the keyboard. The pupil or trainee may selectively effect the musical performance on the keyboard with or as the accompaniment by or for the automatic musical performance.

Abstract: An automatic rhythm accompaniment system comprises memory units storing a plurality of rhythm patterns and a designating switch for selecting a desired rhythm pattern. A memory unit is further contained in the system for previously storing chord progress data and further storing control data to fill in an ad-lib rhythm. Therefore, the rhythm accompaniment system may perform the ad-lib rhythm in place of the rhythm pattern by the switch designation for each measure. Additionally, the accompaniment based on the chord progress data may also be performed automatically.

Abstract: A disc having holes in the periphery thereof is moved by successive increments so that the holes are successively brought into alignment with a photocell. The diameters of successive ones of the holes correspond to the pitch of successive tones in a musical selection. A tone generator is employed to develop a tone signal which varies in pitch in accordance with the diameter of the holes in the disc.