A combination gyrohorizon instrument for aircraft which visually indicates in addition to the dial display presentation of the instrument, by means of signal lamps appropriately placed with respect to the instrument dial and an audible signal indicative of energization of any one of the signal lamps, departures from straight and level flight that exceed reasonable limits of pitch and bank. The signal lamps, indicating "nose up," "nose down," "left wing down" and "right wing down" are in circuits...

In a device for the accurate measurement of the specific fuel consumption of internal combustion engines, which utilizes a scale having a pointer movable in front of a dial, the measuring scale carries detector or pick-up means comprising each a first transistorized oscillator circuit with a frequency modulated inductance-capacitance circuit, a second oscillator circuit generating a fixed reference frequency signal, a frequency changer receiving the first and second oscillator circuits signals, ...

A vehicle (e.g. aircraft) head-up display system having the capability of displaying, superimposed on an observer's view of the scene outside the vehicle, symbols representing information required by an observer in the vehicle, together with a pictorial representation of the vehicle environment produced by a signal source incorporating an imaging sensor. The signal source produces an output signal of raster scan format (e.g. a television type line-by-line scan format) and output signals of the s...

A ground-to-air, voiced alerting system whereby a ground controller can communicate traffic warning messages to a pilot in an automatic fashion via a voice radio band and a voiced message generator. The system generally comprising means for transmitting a frequency shift key (FSK) encoded message to the pilot via the voice band and receiver means for decoding the same message. The decoding means, in turn, generally comprising means for identifying specific aircraft and additional means for decod...

A measuring cell having a measuring filament and a reference filament is disposed in a cap of sintered metal. A time base circuit, actuated by the closing of a switch, connects the filaments to an electrical supply circuit after a predetermined delay. Subsequently, the time base circuit sequentially triggers the connection of the filaments to a measuring circuit, the storage in a memory of the value of the output signal of the measuring circuit and the display of this stored value, the disconnec...

An electrical indicator for providing a digital display representation of the value of an input variable has four display areas, each area being arranged to display an individual one of the digits of a four digit number representative of the value of the input variable. Each display area is in the form of a matrix array of light-emitting diodes. The indicator includes a computing unit which is arranged to energize those diodes making up each digit and, by varying the energization, to cause displ...

An analog telemetry system including a plurality of analog encoders at a plurality of remote stations for sensing a plurality of different conditions and providing analog signals corresponding thereto with matching electrical characteristics. Each of the remote stations has a transmitter for transmitting the analog signals to a central control station which includes an indicating meter having a temperature scale and a graduated 0-100 scale for visually representing all of the analog signals rega...

In a leakage current interrupting apparatus for feeder lines a zero-phase current transformer is associated with the feeder lines to trip a circuit interrupter through a control means responsive to the secondary voltage of the zero-phase current transformer. The control means is comprised by a magnetic reed relay or a unidirectional three-terminal element such as a silicon controlled rectifier element.

An indication of altitude variation about a preselected altitude is provided from a real-time altitude digital code information input signal in response to an altitude alert control signal which is proportional to a first pair of complementary sinusoidal functions of the altitude variation. A second pair of complementary sinusoidal functions of altitude is provided from the altitude digital input signal. The first pair of sinusoidal functions is a function of the second pair of sinusoidal functi...

The invention comprises an arrangement for controlling the uniform intensity of different length displayed strokes, produced at different writing rates by a deflectable beam of a CRT, during a series of equal duration clock periods. The arrangement which is provided with the writing rates of each stroke along the X and Y axes of the display surface, estimates stroke length L; L is derived by implementing k(X/2 + Y/2 + P/2), where X and Y are the writing rates along the two axes, P is the greater...