Abstract: A device for displaying an image delivered in particular by a radar on a screen of a television monitor associated with a videographic memory the contents of which are controlled by a control assembly for the control of the display and reception of the image to be displayed, the control assembly functions in conjunction with an after glow processor for processing the contents of certain zones of the videographic memory in accordance with a given law a mathematical treatment formula for producing a pseudo-after glow phenomenon of certain points of the radar image displayed on the screen.

Abstract: A device for converting data for display on at least one television screen associated with a videographic memory, the output signals of the radar comprising at least one videographic signal and scanning data, the device comprises a processor for processing the different radar output data, an analog/digital converter for digitizing the videographic signal, a videographic signal converter for compressing the digitized videographic signal, a distance marker generator for generating distance markers, a polar to Cartesian converter for converting the standard of the coordinates of the data contained in the signal from a polar coordinate system into a Cartesian coordinate system, an intermediate memory for receiving and storing the compressed videographic signal and the distance markers, an output buffer memory for receiving and storing the output signals of the intermediate memory and the polar to Cartesian converter and an interface for controlling the memory as a function of the data contained in the buffer memo

Abstract: This system for displaying data on a display unit comprising a television screen associated with a videographic memory, the data containing at least one videographic signal and scanning data, a pre-processing unit for reel time programming the output data of the radar, a threshold unit for thresholding the videographic signal from its background noise, and a digitizer circuit for digitizing the videographic signal after thresholding, a compression circuit for space-time compressing the videographic signal after digitization, a transmission device for proprietary serial data transmission of the scanning data, of the compressed videographic signal and of compression data, to the television display assembly unit, which comprises a decompression unit for decompressing the videographic signal and a converter unit for converting the standard of the coordinates of the data contained in this signal, from a polar coordinates into a Cartesian coordinates with the aid of the compression and scanning data, and control de

Abstract: An observation apparatus enabling alternative sighting of two objects (11, 21) placed in two intersection planes (1, 2). The apparatus comprises, in front of its objective lens (42), a reflector (6) comprising a single flat reflecting surface capable of pivoting around the optical axis (41) of the objective, this axis being positioned substantially in the bisector plane (5) or a plane parallel to the bisector plane of the dihedron formed by the two object planes (1, 2) while forming a specified angle with a ridge (3) of the dihedron. The apparatus applies particularly to an audiovisual device for sighting, using a camera, a person or a document placed before him or her so as to be readable in a normal fashion.

Abstract: Automatic device for statistical analysis of an object (1), comprising (a) a microscope (4) for projecting the image of an elementary part of the object (1) onto a photoelectric receiver (5), the object (1) and the receiver (5) being displaceable relative to one another, continuously, at constant speed, so that the images of different elementary parts of the object (1) are projected continuously onto the receiver (5); (b) an electronic circuit (7) for continuously digitizing each of the images, followed by a single computer (8) for continuously storing and then for continuously processing these images, making it possible to characterize the latter by a limited number of parameters; and (c) a microprocessor (10) for storage of these parameters and then for statistical calculations by means of all the stored parameters for an average characterization of the object (1) under study.

Abstract: A binocular observation device for a single real or aerial image with a short focal length, comprising an optical element having a semi-reflecting surface permitting the passage of light towards a convergent eyepiece and deflecting the light onto a convergent group of lenses centered about a frontal optical axis which is oblique with respect to the optical axis of the eyepiece, and followed at the rear by a reflective component the optical reflected axis of which is displaced by the interpupillary distance of the eyepiece relative to this axis.

Abstract: Refractometer for measuring the refractive index of a medium (2), using the limiting angle method. A source (4) illuminates a source slit (5) which has as its image with respect to an optical system (S) one of the parallel and regularly spaced slits (5') of a grille (6) fixed perpendicular to the optical axis each of the slits (5') corresponding to an angle of incidence of the optical beam on a prism (3). Turning of a rhombohedron causes the image (5') of the source slit (5) on the grille (6) to be successively on each of the slits (5') of the grille (6). The pupil (L.sub.1), located in the plane of the source, is conjugate with the exit face (8) of the prism (3) and remains stationary when the image (5') of the source slit (5) is moved over the grille (6).

Abstract: Hoisting and lowering mechanism for a mast capable of axial and pivoting ement, comprising a jack housed at the lower part of the mast and fast to a suspension with respect to which the mast can pivot, the end of the rod of the jack being coupled through an anchoring point to the fixed parts situated beneath the mast. The invention is useful for the optronic mast or the periscopic surveillance antenna of a submarine.

Abstract: In a process for checking the dimension of a part, the part is moved continuously through a parallel beam of light, in a direction perpendicular to the axis of the beam, and forms a moving shadow on a pair of spaced photoelectric cells. The cells are spaced apart a distance such that there is a zone in the movement of the part in which both cells are partially shadowed and the sum of the areas of the illuminated parts of the surfaces of the cells is measured at the moment when the difference between the areas of the illuminated parts of the surfaces of the cells is zero, and compared with a reference.

Abstract: An optical observation instrument including on the one hand a mounting in which are mounted a convergent objective lens and a convergent eyepiece and on the other hand a disc formed of optical fibers arranged so as to reverse the image given by the objective lens and connected to the mounting by way of an articulation and held in a stable position, the front face of this disc being substantially at the focus of this objective lens.

Abstract: A fire control device for sighting a gun by introducing, between the axis of the gun and the direction of the target, an angular shift based on the trajectory of the ammunition, the device comprises a sighting telescope in which an image of fire crosswires defining a line of collimation are visible and means for moving the fire crosswires in dependance on a signal from a rangefinder of the laser type which includes a first collimator comprising an objective and crosswires for sighting the rangefinder and an image of which can be seen in the telescope, and a second collimator for shifting the line of collimation which comprises an objective and the fire crosswires which are placed at the focal point of the objective, the second collimator being associated with an optical reflecting element for reflecting the image of the fire crosswires into the telescope and the two collimators are arranged so that the image of the sighting crosswires passes through the optical reflecting element and is reflected by the fire

Abstract: Apparatus for controlling the position of a part, e.g. a feeler or work tool, along two orthogonal directions, the part being slideable in a first slide extending in one direction and mounted on a carriage movable along a second slide extending in the other direction and mounted on a support. The apparatus comprises a device for locating the position of the carriage on the second slide and the movable part on the first slide, a device for measuring the error in straightness of said second slide and a device for measuring the error in orthogonality of the first slide, each device comprising a laser generator for producing a laser beam parallel to the respective direction and a photoelectric detector in the path of the respective beam and subject to the respective error to be measured.

Abstract: An electrohydraulic servo-valve comprises a fixed liner having an inner duct for hydraulic fluid communicating with at least one opening in the liner for substantially radial outward flow, the effective area of the opening being controlled by a sleeve around and slidable relative to the liner, movement of the sleeve being controlled by a torque motor having an electric control for causing oscillation in a plane, the torque motor being connected to the sleeve by a spindle subject to the torque motor and a return spring and articulated on the sleeve.

Abstract: A laser generator (1,2,3) is arranged to generate successive pairs of pulses. Two light receivers (10,11) in the vicinity of the laser generator receive echos of the pulses as reflected from a target and a processing circuit (15) calculates the component of wind speed blowing across the laser axis between the laser generator and the target. The device can be combined with laser ranging means and used for artillery control.

Abstract: An objective for a microscope has a meniscus lens of positive power at one nd of the objective. A lens of negative power is located at the other extremity of the objective. Three intermediate doublets of positive power are located between the first two lenses each formed of a convergent lens cemented to a divergent lens. The meniscus lens situated at the front has focal length between 1.5f and 2.5f. The lens of negative power is a doublet formed of a convergent lens and a divergent lens with a focal length between -8f and -15f. The first doublet located close to the lens of negative power has a focal length between 14f and 18f. The second doublet situated immediately before the first doublet has a focal length between 6f and 8f. The third doublet located between the second doublet and the meniscus lens at the front end of the objective has a focal length between 3f and 4f.

Abstract: Apparatus for conducting firing adapted to the aiming of a cannon movable bearing and in elevation around a turning axis as a function of aim values given by a firing table corresponding to the cannon and other parameters of firing. The apparatus comprises a telescopic sight with an optical deviator element for displacement of the line of sight, the optical deviator element being mounted on a support coupled in bearing and in elevation with the cannon and being subjected to the action of a cam whose profile is determined by the aim values from the firing table and which is coupled to a motor controlled by a rangefinder device whose transmission and reception beams are connected in bearing and in elevation to the axis of the observation scope of the telescope.

Abstract: A measuring device includes means for producing an image of a transmitting iffraction grating, means for shifting the image by an amount related to the quantity to be measured, and a receiving diffraction grating for measuring the shift of the image. Each diffraction grating includes a plurality of tracks of increasing pitch, each track of the transmitting grating having a corresponding track on the receiving grating. The device may form a refractometer.