Abstract: Method and apparatus for ultrasonic non-destructive testing by the pulse echo method. The pulses received from flaws in a test object are supplied to a main branch circuit for amplification to produce a suitable flaw display and to a back echo branch circuit having a lower amplification such that the back echo signal does not saturate the amplifier. During a "flaw gate" period, the output from the main branch circuit is supplied through a high speed electronic switch to a display. At the conclusion of the flaw gate period, the switch is actuated to supply the back echo branch circuit output to the display. In this manner, the back echo signal may be monitored for additional flaw information.

Abstract: The invention is directed to a multi-contact electrical connector, especially a flat pack connector. The housings for plug and receptacle are X-ray absorbent metal to substantially decrease X-ray penetration. The receptacle face has perforations in the housing metal of dimensions to function as an EMI Grid to shield against RFI entry through the wave guide perforations. Also the perforations are long enough to substantially shield the sockets from X-rays striking the perforations at an angle. The plug and receptacle are locked in mated relation by collet fingertips which close to a ball shape for entry and exit from a receptacle recess, and open wide to a diameter larger than the entry/exit opening in the recess to lock the plug and receptacle in the mated position. A spring loaded plunger rod maintains the locked position.

Abstract: Thermoplastic compositions comprising a resin admixture of chlorinated polyethylene with polyvinylidene fluoride are described. These compositions may be formed into a flexible film having particular utility as a laminate for web which may be employed under conditions requiring high stability and flame resistance.

Abstract: A system for providing a digital display of aircraft altitude, a selected altitude which it is desired the aircraft to assume and when the selected altitude is achieved, an audio and visual indication is produced. When within 1000 feet of the selected altitude, the visual indication gives the direction the aircraft must continue (i.e., up or down). When the aircraft exceeds a prescribed range, either above or below the selected altitude, an audio signal is produced. Barometric pressure obtained from air traffic control may be entered into the system and the measured altitude displayed will be automatically corrected.

Abstract: An electrical current-carrying flexible hose wherein a strip is helically wound in tubular form with interlocking tongue and groove edge portions and insulated electrical conductor means are disposed within a hollow central section between the edge portions.

Abstract: Signal data is generated by interconnected non-inverting and inverting voltage followers and is transmitted on power-carrying conductors to a remote detection circuit comprising a differential amplifier which receives equal in-phase signal inputs of opposite polarity, thereby effecting cancellation of any externally-induced noise which might accompany the signal data.

Abstract: Each of the station sets in the system generates a continuous, current-modulated digital data stream carrying information concerning the status of pushbutton-actuated switches associated with a particular service or feature. This data stream is transmitted via a phantom pair over standard four-wire cable to an associated station card in the key service unit, which receives and decodes the data, implements any service requested at the associated station set by closure of a pushbutton-actuated switch in the station set, and generates a continuous voltage-modulated digital data stream carrying instructions for the connection of the station set speakerphone to either the first or second talk path formed by the first and second conductor pairs in the standard four-wire cable, for energization of light-emitting diodes associated with the pushbutton-actuated switches in the station set, and for controlling background music transmission to the associated station set.

Abstract: The ventilation air terminal device for supplying heated, air conditioned or ventilating air to an enclosure comprises cylindrically tubular transition with a mounting bracket thereon for mounting the terminal device with respect to the wall, ceiling or floor. The terminal device extends through an opening in the wall, ceiling or floor, and the mounting bracket secures it flush with the inside of the wall, ceiling or floor. A dome-shaped, circular air diffuser secures over the front of the terminal device to direct air discharging therefrom.

Abstract: An electrical conduit formed of helically fabricated grounding and reinforcing elements, including a spaced-turn foil channel defining a substantially smooth conduit bore, and an end fitting in combination with the conduit.

Abstract: This invention is directed to an electrical connector having substantial shielding effectiveness against EMI energy and especially against EMP energy. The invention improves on known EMI shielded connectors by adding a conductive spring washer, such as a wave washer made from beryllium copper alloy. The spring washer is seated in the plug portion of the connector so as to make electrical contact with the receptacle portion when the plug and the receptacle are mated.

Abstract: An electrical conduit formed of helically fabricated grounding and reinforcing elements, including a foil channel having overlapped turns welded to one another and to a supporting helix.

Abstract: An electrical conduit formed of helical inner and outer channels having movably interlocked flanges, so that the channel convolutions separate on the outside of a bend of the conduit and come together on the inside of the bend.

Abstract: The material tester has three mutually perpendicular directions of motion and a rotary motion about an upright axis. Ultrasonic search units are mounted for motion on or about these axes and are connected to control the speeds along several of the axes and about the vertical axis as well as to produce a signal showing the properties of the material to be tested. The search units are controlled by the motion along the several axes and about an upright axis to follow a contour.

Abstract: A helically fabricated flexible hose having a self-supporting helical reinforcing element of non-circular cross-section with a flat side facing inwardly, thereby imparting a substantially smooth surface to the hose interior.

Abstract: A high pressure hose construction and method of and apparatus for making the same is disclosed wherein the hose construction has a smooth walled inner liner of resilient polymeric material, and an adhesive layer, which may also be of polymeric material bonded to the liner. A braided cover is disposed over the entire layer and embedded therein. This braided cover is comprised of a plurality of elongated intermeshing strands of non-metallic fibers, such as yarn, and metallic fibers. Preferably, every three strands are of flexible, non-metallic fibers, such as nylon fibers, and every fourth strand is of metallic fiber, such as piano wire or spring steel. One set of strands crosses over and under another set to produce an intermeshing or weaving effect. These strands may also extend in a direction at an angle, such as 45.degree. or 53.degree.

Abstract: An electrical connector having a receptacle including a receptacle shell and a plug including a plug housing, a coupling nut threaded on the plug housing and engaged with a coupling ring, the coupling nut having threaded engagement with the plug housing and the coupling ring having locking flanges engageable with cooperable locking lands on the receptacle shell, the plug and receptacle being adapted to be fully electrically mated and locked by rotation of the coupling ring through about 90 degrees. An arcuate detent member subtending an angle of about 180 degrees is keyed to the plug housing for relative axial movement of the plug housing, and is received within an annular groove in the coupling ring for resilient forcible selective engagement of opposite radially outwardly enlarged ends of the arcuate detent member with two sets of radially outwardly formed recesses in the coupling ring.