Abstract: A ditching method and apparatus wherein an excavator wheel provided with an annular array of peripheral scoops is rotated about a horizontal axis while the wheel is moved along the terrain alongside a railroad track. The axis of rotation of the wheel is positioned selectively to be disposed within the range of perpendicular to the longitudinal extent of the track to substantially parallel thereto, whereby the scoops excavate a ditch correspondingly in the range of a narrow trench having a width equal to the transverse extent of the scoops to a wide ditch having a profile corresponding generally to the circumference of the wheel. The wheel is carried on the distal end of a boom having the opposite end mounted to a wheeled support. The wheels are carried on suitable trucks adjustably connected to the support to permit leveling of the support. In one form, the wheel is reversibly rotated and provided with double-ended scoops to permit excavation in either direction of rotation of the wheel.

Abstract: An insulated handwear construction which has an outer shell, an inner lining and an insulation material having thermal convection passages therein positioned between the shell and inner lining. The insulation material connects to a source of heat located on either the palm side or back side of the handwear construction and extends over finger and thumb portions to transfer heat from the heat source to the finger and thumb tips of a wearer.

Abstract: A drill bit for use in combination with a through-the-steel drill stem, the drill bit including an elongated body portion having a bore through which cuttings may be removed, a web extending transversely across the bore for receiving a drill tip, and drill ports leading from the drill tip to the bore and from the periphery of the body portion to the bore, the drill ports comprising opposed axially extending openings contoured as a hemisphere to define opposed axially extending faces of the web and opening to the bore from the drill tip and extending axially along the body portion and opening from the periphery thereof to the bore below the web. The drill bit may be provided with a sleeve to delimit the drill ports.

Abstract: An improved poultry egg incubation structure comprising a plurality of ceiling panels, a plurality of side wall panels, a front end panel including at least one door, a rear end panel including at least one door, improved joining members for interconnecting the ceiling panels, side wall panels and end panels to form an incubation chamber, an air intake vent, an air exhaust vent, an environmental control apparatus for humidifying, heating and circulating air within the chamber, and an intake air flow control apparatus in communication with an intake air flow vent for controlling the mixing of cool external air with the heated and humidified internal air and for preventing the cool external air from flowing directly into the area of the incubation structure containing incubating eggs. The improved joining members including a corner support member, a ceiling electrical outlet assembly and a side wall gasket support member and gasket.

Abstract: A control circuit for shaded-pole motors used in an acoustic pulsato system for producing special musical effects. The system includes a horn-type loudspeaker connected to a shaded-pole motor and/or a drum-type loudspeaker connected to a shaded-pole motor. Each type of loudspeaker has a feedback circuit and a means for the operator to select the desired speed for the motor. The feedback circuit quickly adjusts the actual speed of the motor to correspond to the selected speed by controlling the amount of current or power supplied to the motor. The drum-type loudspeaker feedback circuit also includes a braking circuit to quickly stop the motor and the drum rotation to prevent unpleasant spurious signals which occur if the drum loudspeaker is permitted to coast to a stop on a slower speed.

Abstract: A multiple cell flat molded from lightweight plastic. The cells are defined primarily by sinuous partition walls that are arranged to define an individual cell shape in the form of two opposed ogee arches connected at the wide ends of the arches. Short lateral support ears are located in the cells and support the eggs with the egg surfaces spaced from the cell walls. The flats can be stacked or nested, and have special shapes at the ends for identification and end to end nesting when the stacks are used in the incubator.

Abstract: The present invention is a circuit for controlling the sampling of plurality of channels in an electronic organ having multiplexed keying. The channels having information signals at a particular time period is sensed and used to address a memory. The memory has stored a plurality of sequences of digital signals for controlling the multiplexing and demultiplexing operations of the organ. Only those channels containing information signals are sampled which accordingly increases the sampling rate which increases the frequency of the harmonic component of the square wave signals that can be passed by the system and the distortion caused by aliasing of harmonics is diminished.

Abstract: A method of determining the physical location of undesired resonance zones induced by acoustic feedback in a spring reverberation unit and damping the vibration of these resonance zones. The improved spring reverberation unit with damping material located at the resonance points of the unit produces a reverberated audio signal which is substantially free from the screeching and howling caused by acoustic feedback.

Abstract: The present invention is a differential sampling circuit for improving the signal to noise ratio by eliminating d.c. level distortion in square wave signals used as components for forming a stairstep or bright wave signal in an electronic organ having multiplexed keying. The multiplexed drawbar signals for even footages at both sides of a sampling resistor are demultiplexed, applied to a sample and hold circuit and applied as inputs to a differential amplifier to cancel any fluctuations of the d.c. signal component.

Abstract: The present invention is a chord teaching system and method which assists the organist in learning musical chords. The system functions in several different modes and the various modes are selected by the learning organist. The chord teaching system enables the learning organist to select a chord without demonstrating any knowledge of the correct finger position on the keyboard of the organ necessary to play the chord. The system, depending upon the mode of operation, plays the chord selected and indicates to the learning organist the key corresponding to the root note of the selected chord or indicates to the organist the keys corresponding to the notes of the selected chord or enables the organist to depress the keys that the organist believes form the selected chord and indicates a correct response if the organist depresses the proper key and indicates the correct keys that form the notes of the chord if the response is incorrect.

Abstract: The present invention is a single channel string ensemble sound system for an electronic organ having a keyboard formed by a plurality of keys and a signal generating means responsive to the depression of the keys. The sound system comprises an electronic mixer, an amplifier, a first transducer and a second transducer, wherein the first transducer is driven by the output of the amplifier while the second transducer is driven approximately 180.degree. out of phase electronically by the same output, and wherein the second transducer is physically oriented in a plane approximately 90.degree. from the plane of the first transducer or speaker.

Abstract: A harmony signal generating system for an electronic organ comprises a plurality of integrated circuit chips which each receive upper and lower manual keying signals for two consecutive organ notes. A first read only memory (ROM) generates octave identify signals to designate the octave of an active upper manual note. A second ROM generates octave select signals which are combined with the octave identify signals in a third ROM to generate the harmony signals which comprise the lower manual chording signals played through the upper manual within a twelve note range above an active upper manual note and an upper manual note which is one octave above the active upper manual note. The octave identify signals are provided in parallel among the chips from the chip having the lowest active upper manual letter note. Upper manual active signals generated in response to the upper manual keying signals are connected in series among the chips to select the appropriate chip.

Abstract: A multiplexed electronic organ utilizing a plurality of integrated circuit chips, each chip time division multiplexing selected keying envelope time constant signals from a switched capacitor time constant generator for two alphabetic notes over the entire frequency range of a spinet or for one alphabetic note over the entire frequency range of the manuals and pedals of a console organ. The same integrated circuit chip is used for both spinet or console organs. Each chip contains a multiplexer circuit which isolates the multiplexed keying envelope output signals from the time constant generator and includes as a coupling means a plurality of switching element arranged into groups. Some of the groups are interconnected to provide the keying envelope time constant signal normally intended for one frequency range to the output associated with a different frequency range.

Abstract: A compressed air discharge system for facilitating the unloading of material from the dump bed of such as a dump truck, and which is designed for interconnection with the compressed air system of the dump truck.

Abstract: An improved safety device or guard for use upon a press or other machine, which has a work zone for receiving a work piece, is provided to protect the operator. The guard has a base with sloped surfaces leading to the work area and slidable gates positioned adjacent said base. The operator inserts the work piece by moving it along the sloped surfaces of the base until it contacts the gates and forces the gates upward. The gates are raised only by an amount which is sufficient to allow the work piece to move into the work zone. The gates ride upon the top of the work piece and automatically adjust for various thicknesses of the work piece during the operation of the machine. The guard has flange members which are attached to the base for slidably mounting the guard to a machine and has a barrier mounted upon the base which is angled inwardly toward the work zone for permitting the use of work pieces which are shorter than the overall width of the barrier.

Abstract: A method of forming a vehicle axle assembly including the steps of coaxially welding a spider having a through opening to a tubular spacer to define a subassembly having a through bore, removing material formed by the welding operation from within the bore, installing the subassembly on an axle beam, and concurrently welding an end of the axle beam and spacer to a spindle.

Abstract: A store display fixture for hanging garments and the like is disclosed hag at least one hangrod affixed to at least one downwardly extending rectangular or round or square tube in telescopic engagement with another rectangular tube. The inner tube includes a compression spring-biased plunger projecting therefrom and through one of a column of openings vertically spaced apart along the outer tube. The end of the plunger is beveled to form both an upward and a downward inclined surface such that the tubes are locked into place against collapse during use but may be extended by merely pulling the downwardly extending tube upward. The tubes are retractable by manually depressing the plunger and allowing the downwardly extending tube to slide into a lower position.