Abstract: An optoelectronic sensor (10), in particular a laser scanner, is provided having a light transmitter (12) for transmitting a scanning beam (16) into a monitored zone (20); having a light receiver (26) for generating a received signal from the scanning beam (22) remitted by objects in the monitored zone (20); having a movable deflection unit (18) for a periodical deflection of the scanning beam (16, 22) in order to scan the monitored zone (20) in the course of the movement; having an evaluation unit (34) that is configured to recognize whether there are objects in at least one detection field within the monitored zone (20) with reference to the received signal; and having a projector (42) for visualizing information of the sensor (10) in the monitored zone (20). In this respect, the projector (42) is configured to visualize the detection field.

Abstract: The present invention provides a measuring device, which comprises a leveling unit, a measuring device main body provided on the leveling unit, a control unit, a first tilt angle measuring device for detecting a horizontality with high accuracy, and a second tilt angle measuring device for detecting a tilt angle in a wider range than a range of the first tilt angle measuring device and having a higher responsiveness than a responsiveness of the first tilt angle measuring device, wherein the control unit, the first tilt angle measuring device and the second tilt angle measuring device are provided in the measuring device main body and wherein the control unit drives the leveling unit based on a detection result of the second tilt angle measuring device, performs a rough leveling until a tilt angle detected by the second tilt angle measuring device reaches within a range in which the first tilt angle measuring device is capable of detecting and levels the measuring device main body horizontally based on a detec

Abstract: A riflescope aiming system that includes a telescopic sight, a multiple-zero-point elevation turret and a ballistics reference system. The multiple-zero-point elevation turret includes a rotatable indicator carrier and a plurality of indicator pins secured to the indicator carrier, each indicator pin corresponding to a predetermined target distance. The ballistics reference system is operably coupled to the objective housing of the telescopic sight and displays ballistics data indicia.

Abstract: A laser based measuring apparatus for measuring a position of a distant target is disclosed. Some embodiments may include a laser tracker for detecting the position and the orientation of a measuring aid The laser-based measuring apparatus may include a base, a support, a telescope unit means, a first bearing apparatus, and a second bearing apparatus. In some embodiments the first bearing apparatus is in the form of a fixed/loose bearing apparatus, having a shaft, the longitudinal axis of which runs coaxially with the tilt axis, a fixed bearing and a loose bearing, and/or the second bearing apparatus is in the form of a fixed/loose bearing apparatus, having a shaft, the longitudinal axis of which runs coaxially with the vertical axis, a fixed bearing and a loose bearing.

Abstract: An electronic level which receives a reflection light from a pattern marked on a staff and determines a height of sighting position and a distance to the staff, comprising an electronic level main unit, a sighting optical system accommodated in the electronic level main unit for sighting the staff and a sighting device provided on an upper surface of the electronic level main unit, wherein the sighting device can be sighted at least in two directions, and an angle formed by two directions is equal to or approximately equal to a field angle of the sighting optical system.

Abstract: A sighting device includes an objective unit, an image unit, a transmitter for emitting measurement beams as transmitted beams and/or a receiver for capturing measurement beams as received beams, and at least one optical deflection means for coupling the transmitted beams into the optical beam path of the sighting device. The at least one lens comprises a cylindrical recess around the optical axis, the recess extending in the direction of the optical axis. Furthermore, the deflection means comprises a cylindrical fastening section that extends inside the recess such that a gluing gap is created between the outer lateral surface of the fastening section and at least a portion of an inner lateral surface of the lens defined by the recess, and the deflection means is fastened to the at least one lens, mediated by an adhesive located in the gluing gap.

Abstract: The telescopic sight alignment tool is used to align the horizontal and vertical axes of the scope with corresponding axes of the firearm upon which the scope is mounted. The tool comprises a unitary structure having a plate with a vertical crosshair alignment slit, with an ocular seat extending forward from the lower portion of the plate. Upper and lower alignment indicators extend from the plate. Alternative embodiments provide variations upon the alignment indicators. The tool is placed upon the ocular of the scope and secured adjustably thereon with an elastic band. The tool is rotated to align the slit precisely with the vertical crosshair of the scope. The scope is then rotated in its mounts until at least one of the indicators of the tool is aligned with an element of the firearm, e.g., front sight, tang of the action, etc., and the mounts tightened to secure the scope.

Abstract: A leveling device having a sighting device that defines an alignment axis, an imaging system, spatially separated from the sighting device, having an imaging lens to which a lens primary plane is allocated and a detector having a recording surface lying in an image plane and an evaluation device that is connected to the detector. A visual field of the imaging system is defined by the imaging lens and the detector as the maximum angle range within which points can be registered by the imaging lens by means of the recording surface of the detector. The imaging lens and the detector are designed and arranged relative to one another and to a lens plane comprising the alignment axis such that all points of the lens plane within the visual field are simultaneously imaged in focus on the recording surface of the detector.

Abstract: A method of determining a position of a point in a local coordinate system using a survey instrument comprising an integrated optical total station and digital level includes measuring an angle associated with the point. The angle may be measured about a vertical axis of the survey instrument, and the vertical axis may be substantially aligned with a local gravity vector. The method also includes determining a distance between the survey instrument and the point using an electronic distance measuring device and measuring a difference in height between a horizontal axis of the survey instrument and the point using a leveling staff positioned relative to the point. The horizontal axis may be substantially orthogonal to the vertical axis. The method also includes determining the position of the point in the local coordinate system using the angle, the distance, and the difference in height.

Abstract: A method of stationing an unleveled optical total station includes placing the unleveled optical total station at a first station. At the first station, positions of at least three non-collinear measurement points in an instrument coordinate system are determined using the unleveled optical total station. The method also includes obtaining positions of the at least three non-collinear measurement points in a local coordinate system. A transformation is computed between the instrument coordinate system and the local coordinate system using the positions of the at least three non-collinear measurement points in the instrument coordinate system and the positions of the at least three non-collinear measurement points in the local coordinate system.

Abstract: A sighting device includes an objective unit, an image unit, a transmitter for emitting measurement beams as transmitted beams and/or a receiver for capturing measurement beams as received beams, and at least one optical deflection means for coupling the transmitted beams into the optical beam path of the sighting device. The at least one lens comprises a cylindrical recess around the optical axis, the recess extending in the direction of the optical axis. Furthermore, the deflection means comprises a cylindrical fastening section that extends inside the recess such that a gluing gap is created between the outer lateral surface of the fastening section and at least a portion of an inner lateral surface of the lens defined by the recess, and the deflection means is fastened to the at least one lens, mediated by an adhesive located in the gluing gap.

Abstract: [Problem] To provide a manual surveying instrument that allows easily performing a collimating operation and allows performing a high precision measurement in a short time.

Abstract: An optical device capable of measuring a condition such as deflection of a cylindrical body such as utility pole or cylindrical column precisely and rapidly is provided. The optical device has a telescope with a projection plate. The projection plate has a reference scale made of a plurality of full or substantially full circles arranged concentrically about a central axis of the telescope or a plurality of circular arcs arranged symmetrically about the central axis.

Abstract: A method of determining the eccentricity of an encoder scale member of a rotary encoder includes taking an encoder scale blank having a geometric center and mounting the encoder scale blank centered about a second center. A scale can then be produced on the encoder scale blank thereby forming an encoder scale member. The scale of the encoder scale member is centered about the second center. Any eccentricity between the geometric center and the second center is measured by, for example, measuring any change in the apparent radius of the encoder scale member. The encoder scale member may then be mounted in a working location wherein it is rotated about a third axis. The eccentricity when mounted in the working location may be matched to that measured during manufacture thereof and/or the eccentricity errors arising from both manufacture and mounting of the encoder scale member may be determined.

Abstract: [Problem] To provide a manual surveying instrument that allows easily performing a collimating operation and allows performing a high precision measurement in a short time, [Solution Means] The manual surveying instrument includes a collimation assist device (70) having a collimation light transmitting system that emits a collimation light (R) along a collimation axis (O) toward a target installed at a measurement point, an area sensor (80) that obtains an image of a scene captured within a field of view of a collimating telescope (3), a display unit (48) that displays the image, a collimation light detecting unit (82) that detects the target as a result of receiving the collimation light reflected on the target by the area sensor, and an arithmetic control unit (46) that displays an area (94) being within a predetermined deviation from the collimation axis and where distance measurement is possible and a symbol indicating the target on the display unit as an animation image, judges that collimation has been

Abstract: A device for determining level of a surface, the device comprising a plurality of level vials configured to indicate orientation of the device, the plurality of level vials disposed at distinct locations on the device. The device including a radius bottom formed in an object contact surface at substantially the latitudinal center of the contact surface and extending longitudinally the length of the surface. The device further including a joint recess disposed centrally along the longitudinal axis of the device and extending latitudinally across the device. The device also includes one or more user controllable light sources coupled to the plurality of level vials for illuminating the level vials.

Abstract: A leveling device for determining the zero pressure point of an external draining system with respect to a patient is provided. The leveling device generally includes a body having a viewing element defining a field of vision, and a reference point indicator spaced apart from the viewing element and disposed within the line of vision. The viewing element and the reference point indicator define a line of sight. The device further includes a horizontal level indicator mated to the body and oriented parallel to the line of sight established by the viewing element and the reference point indicator. The horizontal level indicator is effective to indicate the horizontal alignment of the body with respect to a particular reference point viewed through the viewing element and indicated by the reference point indicator.

Abstract: A surveying apparatus is provided that includes a telescope block, a support block, and an imaging unit. The telescope block includes a sighting telescope and is rotatably supported about a first axis. The support block rotatably supports the telescope block about the first axis. The imaging unit is provided inside the telescope block. The imaging unit comprises an image-display device and at least one of an image data output device and an image data recording device.

Abstract: The present invention provides a laser theodolite device and kit for converting a new or pre-existing theodolite into a laser theodolite. More specifically, in one embodiment, the laser theodolite device comprises a theodolite having a visible and/or reflective laser source integrally mounted within the theodolite telescope for generating a laser line along the centerline portion of the telescope line of sight. The kit for assembling a laser theodolite from a new or pre-existing theodolite includes a universally mountable bracket with a laser source secured thereto. The universal bracket is constructed and arranged to be mounted at a forward end of a theodolite telescope housing with the laser source being positioned at about a right angle with respect to the telescope centerline.

Abstract: An alignment apparatus includes a central leg element and one or more secondary support leg elements in operative communication with the central leg element for providing support thereto. A sighting device rotatably attached to the central leg element includes an optical device having at least one optical element therein for permitting a user to view an area of interest in the direction of an optical device axis of sight and a laser-emitting device for emitting a laser beam along a laser axis of projection. The laser axis of projection is parallel to the optical device axis of sight. A method of aligning an underground structure is also disclosed.

Abstract: A surveying instrument includes a surveying instrument body rotatable about each of a vertical axis and a horizontal axis; and a first collimator optical system and a second collimator optical system each of which is positioned in the surveying instrument body to collimate the surveying instrument relative to a survey point, a viewing angle of the second collimator optical system being smaller than a viewing angle of the first collimator optical system. A first collimating operation is performed with the first collimator optical system before a second collimating operation is performed with the second collimator optical system.

Abstract: A device for horizontal and vertical adjustment in geodetic devices comprises within its housing, a horizontal adjusting system comprising a first fine adjustment drive for rotation of the device about a vertical standing axis and a vertical adjusting system comprising a second fine adjustment drive for the movement of a telescope which is mounted in the support of the device so as to be swivelable about a horizontal tilt axis. A coaxial drive, known per se, is arranged at the support of the device and has two coaxially mounted shafts, each having a rotating knob, for initiating the rotation and/or movement of the respective parts and subassemblies. Each of the two fine adjustment gear units comprises a worm and a worm gear with a friction clutch and can be actuated jointly from a location for generating movement in two movement directions running vertical to one another or at an angle to one another.

Abstract: A method and apparatus for leveling at least one output light beam in a construction tool. One embodiment of the apparatus includes a laser optical assembly for producing output light beams that define plumb, level, and right angle beams for use in construction applications. The optical assembly is mounted on an optical platform which permits tilting about “slip-stick” joints that define two perpendicular axes of rotation. Such joints allow the optical platform to change its angle of tilt in response to an applied torque and to maintain the changed angle of tilt until further torque is applied. Also, the “slip-stick” mechanism prevents substantial movement or oscillation of the optical platform in the absence of the applied torque. The embodiment further includes a sensor element for determining whether the output beams are level.

Abstract: An incremental rotary encoder includes a rotary portion, a first sensor and a second sensor, the first and second sensors being arranged so as to be opposite from each other with respect to the axis of the rotary portion. The second sensor is offset from the first sensor so that the phase of output voltage of the second sensor advances or delays with respect to the phase of output voltage of the first sensor by &pgr;/X, wherein “X” represents a real number of one or more than one.

Abstract: An apparatus for checking elevation between reference markers. The apparatus includes a measuring device (e.g., a tape measure) that can measure the distance from an elevated location to the ground immediately below the location. A sighting device and a leveling device (e.g., a hand level) are secured to the distance-measuring device so that a remote reference marker can be sighted. The distance-measuring device is calibrated such that it measures the distance from the ground to the centerline of the sighting device.

Abstract: A surveying instrument is provide with a telescope which is movably supported, an auto-focusing system. Based on a movement of the telescope, a moving status of the telescope is determined from among a rough sighting status, a fine sighting status, and a suspended status. A controlling system is further provided, which controls the auto-focusing system to perform the auto-focusing operation in accordance with the moving status detected by the movement detection system. If the status is the fine sighting status, the auto-focusing operation is continuously performed. If the status is the rough sighting status, then the auto-focusing operation is not executed.

Abstract: A surveying instrument having an AF apparatus, provided with a focusing lens and a collimation telescope, includes a focus detector for detecting a focus state through the collimation telescope, and a controller for moving the focusing lens of the collimation telescope to a focal position, based on the focus state detected by the focus detector. The surveying instrument includes a single focus mode at which only one detection of the output of the focus detector and only one control operation of the controller based on the detected output are carried out, and a continuous focus mode at which a plurality of detections of the output of the focus detector and a plurality of control operations of the controller based on the detected outputs are sequentially carried out, the single focus mode and the continuous mode being selectively performed.

Abstract: The system according to the present invention comprises means for irradiating a plurality of laser beams by separating the laser beams in a vertical direction and means for forming a plurality of laser beam reference planes by rotary irradiation of said plurality of laser beams. Because a plurality of reference planes are formed at the same time, operation can be carried out at the same time at different working sites, and the tilt reference line as desired can be promptly obtained without performing tilt setting operation for the reference plane.

Abstract: A combined satellite positioning and electro-optical total station system including a satellite navigation receiver and a reference oscillator with a reference frequency output that can be related to precision time standards obtained from orbiting navigation-satellite transmissions. Such time standards are output by the satellite navigation receiver and are highly precise. An electronic distance meter (EDM) is included and has an EDM-transmitter for launching an out-bound signal to a distant target, and an EDM-receiver for receiving a reflected signal from the distant target. A phase measurement device is connected to the reference oscillator, and also to both the EDM-transmitter and EDM-receiver. It provides for a measurement of the difference in the number of cycles of the reference frequency between the out-bound signal and the reflected signal.

Abstract: A tilt predictor incorporated into a total station to predict the degree of tilt of the rotational alidade portion of a total station corresponding to the rotational orientation of the rotational alidade portion. In one embodiment, the present invention defines the plane of rotation for the rotational alidade portion with the rotational alidade portion disposed in a first rotational orientation. The rotational alidade portion is then rotated to the desired rotational orientation. This embodiment then predicts the degree of tilt of the rotational alidade portion at the desired rotational orientation.

Abstract: A scope which is positioned over a golf ball which is on a green in position for putting has a housing with a mirror and which functions as a periscope. A vertical alignment guide and a horizontal alignment guide are viewable from above the housing. The scope is positioned over the ball and the crossing point of the alignment guides is aligned with the flag stick in the golf cup. The horizontal alignment guide indicates the slope of the terrain. A horizontal level indicates the level of the ground at the ball position, and a slope level indicates the slope of the ground immediately in front of the ball.

Abstract: An automatic optical plumbing instrument includes: an objective telescopically mounted at a front portion of a telescopic housing adjacent to an object to be observed, an ocular telescopically mounted at a rear portion of the housing adjacent to an observer's eye, and a transparent plumbing protractor defining a plumbing line thereon and mounted in the housing between the objective and the ocular, whereby upon entrance of a vertical line (or plane) of the object into the instrument to form an image therein, a verticality of the vertical line (or plane) of the object can be checked whether the vertical line is aligned with the plumbing line marked on the protractor, thereby providing a plumbing instrument for calibrating a verticality of the object.

Abstract: A theodolite that includes a stand, a telescope, a friction gear and a worm gear. The telescope is pivotally secured to the stand. The clutch plate is secured to the telescope for at least limited rotational movement upon pivoting of the telescope. The friction gear is mounted for rotation about substantially the same axis as rotation of the clutch plate. The worm gear is mounted to the stand and is in constant mesh with the friction gear so that rotation of the worm gear causes rotation of the friction gear. A device engages the friction gear with the clutch plate with a frictional force. The frictional force is adjustable to allow for adjustment of the telescope separately from the worm gear.

Abstract: A geodetic device is described, especially on a theodolite or a tachymeter which is provided with an arrangement for adjustment over a ground point or base point. It comprises a leveling base in which a bushing provided with a continuous center bore hole can be fastened and an upper part or alidade with a telescope which is pivotable about a horizontal tilting axis. Further, a first apparatus is provided for leveling the device in a horizontal plane and for displaying this plane, and a second apparatus is provided which comprise an objective imaging the ground point on a sensor arrangement. The arrangement for adjustment over a ground point is arranged between the leveling base and the upper part and is fixedly connected with the leveling base. It comprises a vertical spindle bushing with a hollow vertical spindle which is mounted therein and carries the upper part.

Abstract: A rotary laser irradiating system, comprising a laser projector for performing rotary irradiation of a laser beam, a collimating telescope having a collimation axis in a projecting direction of the laser beam, and a rotation base where the collimating telescope can be rotated around an axial line running perpendicularly to the collimation axis and can be fixed at a predetermined position, whereby the collimating telescope is used for the setting of a tilting direction, and the collimating telescope is rotated when necessary, and collimation can be performed at least in two directions.

Abstract: A measurement device has a telescope supported by a main body of a total station so as to be rotatable about the horizontal axis. A vertically extending light-passing hole is formed in the main body, so that a distance measuring light wave, which is emitted through the telescope from a light-emitting element provided in the main body, can pass. A prism unit having a corner cube prism is placed on a base point. A centering operation is carried out by rotating the telescope vertically downward. Then, a distance measurement is carried out by radiating the distance measuring light wave onto the corner cube prism through the telescope.

Abstract: An elevation measurement instrument including a support ruler, an optical instrument and a bracket pivotally coupling the optical instrument to the support ruler. The optical instrument includes a first ocular mount having a telescope with a horizontal crosshair and a second ocular mount having a horizontal alignment level device. The bracket couples the optical instrument to the ruler along a horizontally balanced axis. The bracket includes a position indicator colinearly aligned with the horizontal crosshair.

Abstract: An adjustment mechanism for a telescope of a theodolite. The mechanism includes a worm gear that is coupled to a friction gear of the theodolite. The friction gear is coupled to the telescope so that any rotation of the gear will induce a corresponding movement of the scope. The worm gear is coupled to a linear screw and an outer sleeve. The linear screw has a shaft that can push the worm gear and rotate the friction gear to provide a fine movement of the telescope. The linear screw also has a stop that engages an arm of the sleeve. Continued rotation of the linear screw rotates the engaged sleeve and the worm gear to provide a coarse movement of the telescope. The linear screw is connected to a knob which can be rotated by an operator. The operator can induce a coarse movement of the telescope by turning the linear screw so that the stop engages the sleeve.

Abstract: A rifle scope vertical alignment apparatus includes first and second plates, each with a bottom surface shaped as an inverted V. A vertically oriented elongate slot is formed in one of the first and second plates and a receiving channel is formed in one of the first and second plates to slidably engage the other of the first and second plates. A level is positioned on one of the first and second plates such that it is visible from a rear surface of the apparatus. A threaded screw extends through the slot and into a threaded bore on the other of the first and second plates so that the plates can be held in a selected position relative to each other with the inverted V bottom surfaces aligned. The alignment method involves positioning the inverted bottom V of the first plate of the alignment apparatus atop the rifle barrel just in front of the objective end of the scope, placing the inverted V bottom surface of the second plate atop the scope barrel and then tightening the threaded screw.

Abstract: The encoder disc rotating device for a surveying instrument comprising a vessel-shaped cover member 30 rotating coaxially with a rotating axis 22 of an encoder disc rotating knob 21 and having an opening formed at the arcuate lateral side for protruding to expose the encoder disc rotating knob 21, in which the encoder disc rotating knob 21 is protruded to expose or concealed by the rotation of the cover member 30. The cover member can ensure a large space for arranging the operation system without changing the machine height and cover the encoder disc rotating knob for preventing erroneous operation without hindering the operation.

Abstract: An adjustment mechanism for a telescope of a theodolite. The mechanism includes a worm gear that is coupled to a friction gear of the theodolite. The friction gear is coupled to the telescope so that any rotation of the gear will induce a corresponding movement of the scope. The worm gear is coupled to a linear screw and an outer sleeve. The linear screw has a shaft that can push the worm gear and rotate the friction gear to provide a fine movement of the telescope. The linear screw also has a stop that engages an arm of the sleeve. Continued rotation of the linear screw rotates the engaged sleeve and the worm gear to provide a coarse movement of the telescope. The linear screw is connected to a knob which can be rotated by an operator. The operator can induce a coarse movement of the telescope by turning the linear screw so that the stop engages the sleeve.

Abstract: A flip-up leveling device is designed to be easily attached to an existing hand-held firearm. The purpose of the device is to eliminate sideways tilting or canting of the firearm during aiming. The device can be attached directly to the firearm or to a telescopic sight which is mounted to the firearm. A bubble spirit level is mounted on a pivoted carrying arm so it can be pivoted upward to an easily visible use position or downwardly to a protected storage and transport position. The device does not interfere with the field of view of the existing sight system it supplements. The device does not require any modification of the existing sight system.

Abstract: A measuring apparatus having a high water-proof property has water-proof rings rotatably disposed about outer peripheries of a horizontal shaft and a vertical shaft bearing. Gaps between the rings and the peripheries of corresponding openings in a housing are blocked by respective deformable elastic water-proof members which secure the rings to the housing.

Abstract: A device is disclosed for accurately and precisely locating specific points on ceilings or, alternatively, on the the same horizontal plane. A light emitting means, a pendulum, a support, and two cylindrical rods act in concert to provide a light beam that is always plumb or always horizontally level.

Abstract: A device for centering geodetic instruments over defined ground marks or defined position marks is described, in which a visible light beam is projected onto a ground mark or position mark. In an advantageous additional feature, the light beam of the invention can be used to measure the distance between the sighting line of the geodetic instrument and the sighted ground mark or position mark.

Abstract: A bearing bush with a side opening is mounted within a telescope barrel. The telescope thus may be easily mounted on a tilting axis by simply inserting an axle into the bush. Mounting and adjustment of the tilting axis within its bearings and of angular measuring systems is thus independent of mounting of the telescope.

Abstract: The surveying instrument contains a component part (1) for the optical imaging of a target and a camera (2) for the electronic acquisition of the image produced in the optical instrument part. A reference mark (20) is located in the optical part (1) of the instrument, and this is outside that region of this instrument part through which the optical axis passes. The image of the target is projected into the region located within the reference mark. Connected to the camera is a circuit arrangement which can detect both the effective center of the image of the reference mark and the effective center of the image of the target and which can determine not only the length, but also the direction of the distance between the two effective centers. The surveying of an object or a region can be carried out automatically by means of this instrument.

Abstract: A surveyor's instrument such as a surveyor's level (10) and method is disclosed wherein a constant instrument height may be provided during repeated set ups of a tripod (22) at different locations at a job site. An adjustable elevating device (24) is provided which mounts a surveyor's level (10) in a manner that its vertical position is changed. The elevating device includes an adaptor base cap (30) which adapts to a tripod collar (20) having a hollow sleeve (32). A shaft (28) which carries an adapter collar (26) is slideably received in the sleeve (32) and set in a desired vertical position by set screw (38) or a gear drive (50, 46, 40). The surveyor's level (10) is affixed to an adapter collar (26) by a level base cap (18).

Abstract: The present invention relates to a topographical surveying instrument, comprising:a horizontal table bearing a shaft perpendicular to the plane of the table,a device adapted to rotate on the shaft and comprising:a generator of a light beam perpendicular to the axis of the shaft,a measuring tape unwindable parallel to the beam,a ruler for plotting on the table.The invention is more particularly applicable to an apparatus for surveying conspicuous points inside premises.

Abstract: Active manual designation system combining the inertial stability of velocity loop systems with the use of the reflex movement of the operator for control purposes. It comprises a control member fixed to a support of the sight unit parallel to the aiming line and whose output signals are the nominal information values for the loops for regulating the rotation velocities about the azimuth and elevation axes. The operator holds the member in his right hand, places his right eye on the aiming line and keeps himself against the turret by means of a handle on which there is a correct sighting button.