Abstract: A circuit arrangement for monitoring interruptions in each of two closed-circuit loops, which loops are laid in at least one cable. One end of each loop is connected, with the optional interposition of circuit elements, to one pole of a voltage source, the other end of each loop being connected, via a resistance network, to the other pole of the voltage source. Potentials derived from points in the resistance networks are used to directly control an electronic switching element which changes its conductivity state in the event of any interruption in at least one loop. Interruptions in the respective loops lead to a corresponding rise or fall in potential of the respective network whereby the electronic switching element is actuated.

Abstract: A logic controlled APR system including arming logic, engine failure detection circuits, and test circuit means for testing system operating condition without engine operation. The logic controlled APR system detects an engine failure in a multi-engine aircraft and provides solenoid controlled increased fuel flow to the remaining normally operating engines, and includes a disarm mode in the event of an RTO (rejected take-off).

Abstract: An analog computer for controlling the ignition system of an internal combustion engine. A continuous signal is synthesized corresponding to the ignition advance angle as a function of the engine speed of rotation and of air intake pressure. This signal is synthesized in accordance with a characteristic for the particular engine concerned. The ignition advance signal is used to control commencement of a power supply pulse to the ignition system, with respect to a reference time signal, as a function of the instantaneous speed of rotation of the engine. Preferably the duration of the power supply pulse is maintained constant regardless of engine rotation speed and ignition advance angle. The circuits described for fulfilling these functions are designed for realization as bipolar integrated circuits.

Abstract: Computerized axial tomographic apparatus provides sets of "edge readings" which relate to the absorption suffered by penetrative radiation on traversing respective paths through a part of interest in a body, the various paths being coplanar. These edge readings are processed to permit the evaluation of the absorption coefficients at a plurality of locations distributed over the part of the body in the irradiated plane. In accordance with the invention the necessity for such processing to involve large scale multiplication is overcome by employing a processing technique which utilizes Walsh functions.

Abstract: A compensated vehicle heading system wherein magnetic heading information is combined with heading information determined by sensing vehicle dynamic movement to provide augmented heading information is disclosed. The magnetic heading information is provided by a magnetic heading sensor. The heading information determined by sensing vehicle dynamic movement is provided by a vehicle dynamic system that senses vehicle direction changes. In one form, the vehicle dynamic system includes magnetic sensors mounted so as to sense the speed of rotation of the undriven wheels of a land vehicle and generate pulse chains in accordance therewith. These pulse chains are scaled and applied to an UP/DN counter. The output of the UP/DN counter is continuously compared with the magnetic heading information and the results of the comparisons control the gating of a trickle pulse addition to the scaled pulse chains applied to the UP/DN counter.

Abstract: A low cost shipboard reference system for carrying out the rapid alignment of aircraft inertial platforms in which an aircraft quality inertial reference is installed on shipboard and is operated in conjunction with a shipboard Kalman filter providing updating information thereto with the update connection from the Kalman to the shipboard inertial system normally kept opened and always kept opened during aircraft platform alignment to result in reference outputs for use in the aircraft system which are free of correlated noise but of sufficient accuracy for rapid alignment with a small azimuth error.

Abstract: A pulse circuit periodically produces test pulses of two different amplitudes which are eventually fed in appropriate time intervals to the input of a multi-channel pulse height analyzer to enable continuous monitoring and correction of the offset of the analyzer. Although the amplitudes of both pulses may drift with temperature and time, their amplitude ratio is substantially constant over a broad temperature range. The ratio of numbers, corresponding to the locations of the centroids of the two test pulse peaks in the pulse height analyzer output spectrum, is compared with a reference value of this ratio, and, if the measured ratio deviates excessively from the reference, the offset of the analyzer is adjusted in a direction such that subsequent centroid measurements and ratio comparisons yield tolerably small deviations from the reference ratio.

Abstract: An electrical input signal representative of the existing operating state of a rotating bladed disk or other rotating member is classified into one of a plurality of predetermined operating states and a sequence detector is employed for detecting the occurrence of one of a plurality of possible predetermined sequences of such operating states. Predetermined fixed damage coefficients are then correlated with respectively corresponding detected predetermined sequences of operating states and accumulated with other similarly selected damage coefficients so as to provide a cumulative indication of low cycle fatigue damage done to the rotating member over its past history of experienced operating state sequences.

Abstract: There is disclosed an electronic calculator capable of implementing a handicap formula for selecting and computing the probability of success of an entry in a racing contest based on past performance and earnings. The calculator can be used as an ordinary calculator or by means of a selector circuit, be placed in a handicapping mode to enable a user to compute the purse level of an entry at any one of a plurality of different tracks. The calculator is electronic and hence, performs all functions with great speed and ease.

Abstract: For use in an electronic weighing or force measuring system having a load cell providing an output signal representing measured force or weight, a ratiometric analog-to-digital converter operative with a low level differential input signal from the load cell and providing differential sensing of load cell excitation for use as a reference signal and generation of any required offset signal.

Abstract: An electronic cash register having an inverted U-shaped housing with at least two, spaced, downwardly extending side members. A cash till is positioned between the side members of the housing and is movably mounted with respect to the housing. The cash till forms at least a portion of the bottom of the cash register. In the preferred embodiment, the cash register keyboard data entry means, electrical signal processing means and output display means are mounted on and electrically interconnected by a single printed circuit board that is secured with respect to the register housing.

Abstract: A ship's maneuvering simulator comprises a wheel house of a ship having a projection screen spaced therefrom and a point light source-shadow image projector provided for the projection of a shadow image, and one or more scale models and air-water images controlled by a computer, and a projection device for the projection of a motionless part of a forepart of a ship that is visible from the wheel house. At least two plane translucent projection screens are provided that join one another at an angle, and behind each projection screen the point light source-shadow image projector is mounted such that the central position in the wheel house and the stationary point light source are positioned symmetrically with respect to this projection screen and the models provided are uniform.

Abstract: A system for recording an inventory of articles, in an article storage area, comprisesA. a platform sized to be attached to an inventory taker moving about the article storage area,B. instrumentation including an alphanumeric keyboard unit, calculator and display supported on the platform,C. a data recorder operatively connected with the keyboard unit, and means to support the recorder on the inventory taker, andD. the keyboard unit including alpha and numerical keyboards and arithmetic function keys, and there being circuitry including two additional keys the first of which is operable when manually selected to enable recordation by the recorder of the keyboard output and to disable the calculator connection to the recorder, and the second of which is operable when manually selected to interconnect the calculator and the recorder.

Abstract: A magnetic compass system in which an output signal indication is produced of true heading. An electronic navigation receiver such as a Loran or Omega receiver is employed to provide sequential indications of present position which are processed to produce a signal representing the average course made good for a selected heading. The course made good signal is processed with a signal indication of magnetic compass heading to correct for deviation and variation errors and yield an output signal representing true heading.

Abstract: Audiometric system for monitoring manually-conducted hearing tests and for automatically recording the results of such tests. The system includes a modified audiometer for applying tones to a subject at selected frequencies and amplitudes, and a data interface for converting the control settings of the audiometer to digital data in a format suitable for operating printing apparatus to make a printed record of the audiometric test data in predetermined format. The digital data may also be recorded for subsequent analysis or other use. The data interface provides various operational safeguards which assist the audiometer operator in the desired performance of the audiometric testing procedure.

Abstract: A navigation method and system suitable for highly accurate all-weather navigation of vehicles such as ships and aircraft. An initial position of the vehicle relative to a plurality of known points each located at predetermined geographic positions is first determined. The distance or range of the initial position from each of the plurality of known points is determined and when the vehicle moves to a second and unknown position, the difference between the propagation time of electromagnetic wave energy transmitted from each of the plurality of known points at the initial and second positions is determined to thereby determine an incremental change in the distance to the second position from each of the plurality of known points.

Abstract: A coordinate indicating and plotting system wherein compass heading signals are periodically integrated at frequencies related to the distance traveled by a water, air or land vehicle to obtain coordinate change signals for visual indication of vehicle coordinates. The coordinate change signals can be applied to a plotting system to record the path followed by the vehicle or applied to a counter to indicate the unit changes for the vehicle in each direction. Desirably, the compass heading signals are digitized by converting the heading signals into frequencies and the signals are integrated by summing the pulses for each output direction during each sampling period. A novel crescent-shaped opening whose width approximately follows a sine function between zero and 180.degree. is positioned angularly on the compass card about the center of rotation thereof.

Abstract: A field selection data operating device consists of three cascade connected circuits: a field selector and shifter circuit, an arithmetical and logical operator circuit and a bit shifter and concatenator circuit. The selector and shifter circuit is controlled by a field length code, a shift value code and a first field bit rank code. It comprises two stages of multiplexing members. The first stage ensures, in circular permutation, a shift of the bytes of an applied data word so as to place the byte containing the bit of the first field bit rank code at the place in the word pointed by the shift value code and the second stage completes the shift to the said bit in the byte and generates an output mask according to the field length code. The mask is also applied to concatenation control inputs of the bit shifter and concatenator circuit.

Abstract: A thermal line printer includes a semiconductor chip for control of A .times. N heaters arrayed in N groups past which thermally sensitive paper is stepped B times in printing a line of characters in an A .times. B dot matrix. A sequential access memory stores N multibit words, one word for each character to be printed on a given line with a commutator cyclically to read words from the memory A .times. B times for each line to be printed. A ROM has an A .times. B dot matrix code therein for each available character. A time sequencer and decoder connected to the ROM is synchronized with the commutator to produce a different one bit output from the ROM each time each given word is read from memory. A set of N enable circuits leads from the ROM to N groups of heaters. A set of A enable circuits leads from the sequencer to A groups of heaters where one heater in each A group is from one of the N groups.

Abstract: This invention relates to a system for simulating a power plant synchroscope in which a digital computer supplies the information which indicates when two alternators are, or are not, in synchronism. Digital words are supplied by the computer to two separate registers whose parallel outputs are applied to the inputs of two separate frequency multipliers, one for each register. A single oscillator supplies its output to the second inputs of both of the multiplier, and the frequency of the oscillator is therein multiplied by the value of the words from the computer. The outputs from the two multipliers are supplied to two separate channels, one representing each of the two alternators. The square waves in each channel are converted into sine waves which are then applied to the incoming and running windings of a standard synchroscope. In addition, the information in the two channels is applied to the inputs of a phase difference detector which produces a digital phase difference.