Abstract: An improved power tong apparatus having power means for supplying rotative forces to a first tubular member in order to make or break a connection between such tubular member and a second tubular member and for measuring and displaying the torque supplied by the power tong apparatus to such tubular members. The power tong apparatus includes an internal transfer shaft means associated with the transfer shaft for transducing the angular deformation of the transfer shaft into an electrical signal representative thereof. A slip ring assembly is secured to a selected end of the transfer shaft for conducting electrical signals supplied to it. A display means is electrically connected to the slip ring assembly for receiving electrical signals produced by the transducer means.

Abstract: An apparatus for indicating the level of fuel in a fuel oil storage tank including a vertically positioned tube having a multiplicity of longitudinally spaced and movable floats therein and a multiplicity of associated reed switches and resistors positioned on the outside of the tube and spaced from each other. The switches are actuated by magnets on the associated floats, which rise and fall with the fuel level, and shunt varying amounts of current by the resistors so that a fuel level readout can be obtained on a meter.

Abstract: Rotary ultrasonic testing apparatus comprises an annular stator; a replaceable annular ultrasonic probe assembly mounted for rotation on the stator; and first and second fixed replaceable annular guideways for the articles to be tested, said guideways having internal configurations arranged to conform to the cross-section of the article to be tested and provide a close tolerance guide therefor, and said guideways each having a side surface adjacent the probe assembly which serves at least partially as a radially inwardly extending side wall of the probe assembly.

Abstract: A system for measuring the water level, within a predetermined range, at the bottom of a tank containing gasoline. A first air bell is adapted to be inserted into said tank and has an opening in the lower part thereof to define a first interface. A second air bell is disposed interiorly of the first air bell and has an opening in the lower part thereof to define a second interface which is lower than the first interface. The upper ends of the air bells are in communication, respectively, with opposite legs of a manometer so as to produce a displacement of manometer liquid as a function of the difference of hydrostatic pressure between said interfaces whereby said displacement is a function of the water level therebetween, there being minimum displacement when the water level is at said second interface and maximum displacement when the water level is at said first interface.

Abstract: A servicing arrangement selectively displaceable along an open-end spinning machine which includes a number of individual spinning stations. At least one measuring head is arranged on the displaceable servicing means so as to selectively monitor the quality of the running thread or yarn at the individual spinning stations. A control apparatus is operatively associated with the measuring head and receives signals therefrom, whereby the control apparatus regulates elements for arresting a spinning operation at a spinning station and/or marks individual spinning stations and/or blocks a piecing operation at the spinning stations when the quality of the running thread or yarn at such stations is below a predetermined quality.

Abstract: The method of making self-twisted fibrous product from at least two strands relates to spinning. According to the method, each one of a pair of continuously fed strands is acted upon by a torque imparting to the strand an alternating twist. Then the strands are united or plied, so that they untwist about one another, forming the self-twisted product, the strands, as they are thus untwisting about one another, having positively applied thereto a torque in the direction of their untwisting, with the frequency of the variation of the direction of the torque equalling the frequency of the variation of the sense of the twist imparted to each strand. As a result, reliable engagement of the strands is attained without acting thereupon by friction, which minimizes the drift in space of the point of engagement of the strands, whereby the length of the portions devoid of the twist is reduced and stabilized, and the twist of the strands is fully utilized in the twist of the product.

Abstract: A gut is provided for a sports racket such as a tennis racket. The gut is made with carbon fibers. The gut may be made solely of carbon fibers or there may be a combination of carbon fibers and organic and/or inorganic fibers. A coating may be provided for the resultant product which may be a synthetic resin or metallic. The carbon fiber is above 150 kg/mm.sup.2 in tensile strength.

Abstract: In an apparatus for continuous draw-off of yarn from a package at a measured rate and under regulated tension, the yarn can either be passed to a waste receptacle for a predetermined length of time or can be metered to a scale for subsequent determination of yarn weight per unit length (denier). Diversion of the running yarn from one path to the other is achieved without affecting yarn draw-off rates and tensions.

Abstract: A foam monitor senses the dissipation of foam within a transparent tube and employs a series of vertically spaced light emitting diodes which are cyclically pulsed to provide repetitive sequential scanning of the tube contents and a series of photo-responsive elements are axially spaced along the diametrically opposite side of the tube and positioned to monitor corresponding intermittent light paths that may be received from the corresponding light emitting diodes. The intermittent light paths are monitored during each scanning cycle to provide a pulse train which is indicative of the relationship between scanned levels containing foam and scanned levels void of foam. The pulses produced over a predetermined number of repetitive scans are totalized to provide an analytical measurement of the foam dissipation qualities for the liquid involved.

Abstract: A control system for the pneumatic treatment of yarns, for example, self-twist yarns, includes a pneumatic-hydraulic transducer which converts a control signal related to the speed of the yarn supply means into variations in hydraulic pressure. The transducer is connected to a hydraulic manifold which has branch hydraulic lines leading to hydraulically controlled pneumatic valves. The pneumatic valves control the flow of compressed air to yarn air treatment devices such as jet twister devices.

Abstract: The self-calibrating leak detector circuit arrangement comprises a measuring probe for generating an electrical signal when exposed to the leaking gas. A measuring amplifier is connected to the probe for amplifying the electrical signal and a second integrating amplifier stage is connected to the measuring amplifier output for amplifying the signal. The second amplifier stage has a feedback connection to the input of the measuring amplifier for counteracting at least a part of the electrical signal from the probe. A push button switch is advantageously connected between the measuring amplifier and the second amplifier stage to momentarily impress the output of the measuring amplifier on the input of the second integrating amplifier stage. Indicators are connected to the outputs of the respective amplifiers for a reading of their respective outputs.

Abstract: In a rotor spinning machine having a multiplicity of spinning stations and sliver containers disposed in tandem in two rows, a device for replacing the sliver containers includes a rotary table having means for carrying four sliver containers for a respective group of four spinning stations.

Abstract: A pycnometer apparatus is disclosed for accurately determining the volume of a condensed material sample. Equal free space volumes are established in a pair of gas filled chambers before and after insertion of a sample of the condensed material within one of the chambers. The volume of the sample receiving chamber is increased to maintain equal free space volumes after the sample is inserted, the adjusted increase in volume providing a highly accurate determination of the volume of the sample. The apparatus may also be employed to determine the compressibility or the porosity of a material sample.

Abstract: Apparatus employing ultrasonic energy for detecting and measuring the quantity of gas bubbles present in liquids being transported through pipes. An ultrasonic transducer is positioned along the longitudinal axis of a fluid duct, oriented to transmit acoustic energy radially of the duct around the circumference of the enclosure walls. The back-reflected energy is received centrally of the duct and interpreted as a measure of gas entrainment.One specific embodiment employs a conical reflector to direct the transmitted acoustic energy radially of the duct and redirect the reflected energy back to the transducer for reception. A modified embodiment employs a cylindrical ultrasonic transducer for this purpose.

Abstract: A system for testing the performance and vulnerability of proximity fuzes der simulated live hardware conditions. The performance of the system is evaluated by the application of a repeater jammer signal within the cutoff range of the proximity fuze which is mounted in a free space test site. Beyond the cutoff range, the vulnerability of the proximity fuze is tested by the application of an unlimited number of modulated interference jamming signals which simulate approach and intercept of interference jamming sources.

Abstract: A core thread is combined with staple fiber in a spinning rotor by feeding the core thread to form a loop in the fiber collection surface while feeding and withdrawing the core thread in a manner to maintain it substantially linear, and the stable fiber is spun into an outer yarn shroud twisted about the axis of the core thread. The core thread feed tube is located at one side of and spaced from a diametral plane through the fiber collection surface, and the fiber feed tube is located at the opposite side of and spaced from such plane through the fiber collection surface. A loop is formed in the core thread by delaying startup of drawoff rollers for a predetermined interval after startup of core thread supply rollers, and the loop is laid on the circumference of the fiber collection surface by rotation of the spinning rotor.

Abstract: A hydrocarbon vapor analyzer for direct measurement of the percentage by volume of hydrocarbon vapor is a portable device utilizing two substantially identical vertically disposed graduated cylinders or burettes in which are mounted slidable and adjustable pistons for varying volumetric conditions and measuring changes in volumetric conditions of vapor mixtures of air and hydrocarbon being analyzed therein. One of the graduated cylinders defines a chamber for receiving the sample vapor mixture to be analyzed and the other provides a means for measuring the sample after it is transferred to the second burette through a device for absorbing the hydrocarbon vapor from the vapor mixture to be analyzed.

Abstract: A portable explosion-proof gas detection device, comprises a housing which defines an interior flameproof motor chamber with an electric motor in the chamber having a pump drive shaft which extends outwardly into a pump chamber having a rotor connected to the electric motor shaft. The rotor engages a hose connection which is arranged in an openable chamber and which is engaged by a rotor over a pump squeezing surface defined the housing surrounding wall. The hose is connected through a twin fitting to a holder for a testing tube which has an opening at each end is positionable in a tube holder so that its open end is oriented in an opening in the housing for the inflow of air through the tube and through the pump for discharge out of the housing. The apparatus includes a control knob which actuates an electrical control circuit which is magnetically actuable by rotation of the knob to energize the electric motor from a battery source which is also arranged within the housing.

Abstract: A fluid flow rate meter is disclosed for measuring the flow of fluid in a partially filled conduit or channel, including an electromagnetic probe adapted for mounting in the conduit below the low water mark thereof to produce a sensed velocity signal, and a liquid height pressure transducer including an air tube having a bubble-producing opening adjacent the probe for generating a liquid height signal that modifies the sensed velocity signal to produce a resultant signal that corresponds with the average velocity of fluid flow, whereby a more accurate measurement of the rate of fluid flow is obtained. The average velocity signal is multiplied with a conduit area signal obtained from the height signal by a function generator circuit which takes into account the maximum diameter of the conduit (or maximum height of the channel). A percent flow signal is modified by a second function generator in accordance with the area of the conduit.

Abstract: A supersaturation hygrometer formed by a thermo-optical servo system which esponds to water vapor changes in the range just above and below water saturation. The system includes a hydrophobic metal chip on which monodisperse submicron salt particles act as centers of water condensation. A change in scattered light from the solution droplets on the chip drives an infrared source which heats the chip to keep the size of the droplets constant. The infrared power is related to the chip ambient temperature difference which is proportional to the ambient water vapor pressure.