Abstract: Laser alignment methods and apparatus are disclosed whereby pipe and similar materials may be aligned. The methods and apparatus are adapted to be utilized on the end of pipe or other material and thereby using as a reference point that pipe or other material with the reference beam generated by the laser providing a center reference point from the pipe on which the laser is mounted. In a preferred embodiment, the laser apparatus mounting is threaded so as to be used in mating relationship with the ends of complementarily threaded pipes. A preferred embodiment has a mounting adaptor for the laser that either has tapered steps or is shaped like a tapered cone so that a single adaptor can be friction fitted into pipes of different diameters.

Abstract: A surveyor's tool to facilitate the measurement of the elevation of an invert within a manhole includes a rod with a dimensioning along its length. The tool further includes a slide moveable with respect to said rod. The slide includes a pair of opposing arms, the arms extending from opposite sides of the slide and extending perpendicular to the length of the rode. The slide further includes an inclinometer for measuring the angle of incline of the rod. Using the length of the rod extending into the manhole and the angle of the rod as determined by the inclinometer the depth of the invert can be calculated.

Abstract: A digital display compass for mounting on vehicle rear view mirrors, including a direction sensor module generating signals corresponding to a direction that it is facing attached to the inside of the vehicle windshield, an electronic housing attached to the back side of the rear view mirror, and a digital display attached to the front side of the rear view mirror. A flexible transmission cord extends from the directional sensor module to the electronic housing, and transmits the signals from the direction sensor module. The electronic housing contains a battery power source and electronics for converting the signals received from the transmission cord to drive a digital display representative of the direction sensed by the direction sensor module. A flexible cable extends from the back side of the mirror to the front side of the mirror and provides electronic communication from the electronic housing to the digital display.

Abstract: A device which is attachable to the mast of a forklift for indicating to the forklift operator the tilt angle of the mast in a vertical plane centered on the forklift includes a pivotably supported weighted pendulum, and an elongated activating arm secured to the upper extremity of the pendulum. The activating arm operates a component that is slideably mounted to a base plate, and carries an indicating pointer. A cover member fits over the base plate, and contains a window which accommodates the pointer. Indicia on the cover member interact with the pointer to show the tilt angle of the mast.

Abstract: An ultrasonic-welding apparatus including: a cradle, onto which two work pieces are mounted, and which can rotate around an axis vertical to the welding surface of the work pieces; a welding horn, which carries out welding using ultrasonic energy while sandwiching the two work pieces between it and the cradle; a transmission-type laser sensor which measures the fixed part of the work pieces after welding, rotating on the cradle, in the condition that the welding horn is apart from the work pieces after welding; and an optical sensor including a light-emitting part, a light-receiving part, a connecting part on which the light-emitting and light-receiving parts are mounted, and an adjusting part that rotates the connecting part around two axes.

Abstract: An apparatus used with a range pole and survey instruments for leveling and setting elevations and a method of use of the apparatus. A frame holds a range pole, on an embed plate, without assistance of a surveyor's assistant while a surveyor communicates with an iron worker to effect elevation adjustments of the embed plate.

Abstract: An apparatus for supporting a combined substrate structure, comprising first and second substrates combined, includes: level-adjustable supporting mechanisms for supporting plural supporting points of a bottom surface of the combined substrate structure; a level-detecting system for detecting respective levels of corresponding points of a top surface of the combined substrate structure to the plural supporting points of the bottom surface; and a control system for receiving the detected levels from the level-detecting system and for controlling the plurality of level-adjustable supporting mechanism in respective level-adjustment operations in accordance with the detected levels.

Abstract: In a lifting vehicle having a holding and lifting device(5, 6) for holding and raising or lowering goods (9) and having a central operating device for controlling the travelling and handling of the goods (9) held by the holding device (6), the handling of sensitive goods by the person operating the lifting vehicle can be made easier or monitored by the holding device (6) being equipped with a sensor device (8) for the instantaneous inclination and/or the instantaneous accelerations of the holding device (6).

Abstract: Methods for aligning a satellite reflector with an antenna that has a feed/LNBF assembly. The feed/LNBF assembly is electronically coupled to a set top box which is electronically coupled to a television that has a television speaker. A transmitter is placed adjacent the television speaker. The speaker transmits the audio tones emitted by the television speaker which are indicative to the alignment of the antenna with a satellite to a speaker located adjacent to or attached to the antenna.

Abstract: An angle indicator with a bubble level is provided to adjust a ladder to a predetermined position.

Abstract: In a lifting vehicle having a holding and lifting device(5, 6) for holding and raising or lowering goods (9) and having a central operating device for controlling the travelling and handling of the goods (9) held by the holding device (6), the handling of sensitive goods by the person operating the lifting vehicle can be made easier or monitored by the holding device (6) being equipped with a sensor device (8) for the instantaneous inclination and/or the instantaneous accelerations of the holding device (6).

Abstract: A level indicator utilizing an alignment device, together with a power tool utilizing such a level indicator to determine when such a tool is held in a horizontal or vertical plane. An alignment device (10) has a first component part (12) with an arcuate track (14) with a track following member in the form of a ball bearing (28) to follow the track under the influence of gravity to seek an equilibrium position.

Abstract: An alignment tool is used for aligning an air data sensing probe relative to an aircraft axis has an alignment tool mounting plate that fits over the air data sensing probe base plate and is doweled in position on the air data sensing probe base plate. The alignment tool has a level and incline indicator positioned at a known relation to an axis of the air data sensing probe. The probe base plate and alignment tool are mounted on the aircraft, and the level and incline indicator is used to determine when an aligned position of the air data sensing probe is reached by rotating the alignment tool and probe base plate. The probe base plate of the probe is then fixed in position, and the alignment tool is removed. Bores are formed in the aircraft wall for holding dowel pins extending between the aircraft wall and the probe base plate.

Abstract: An electronic azimuth meter includes an electronic azimuth meter main body and X-direction and Y-direction magnetic sensors for detecting magnetic field components in orthogonal two directions of the main body, the main body includes a magnetic part magnetized by geomagnetism B0 for forming a magnetic field having components in oblique directions relative to directions of the geomagnetism at locations of the magnetic sensors, approximate equation storing means for storing pluralities with regard to respective directions X, Y, of approximate equations calculated based on magnetic field detected values Vx and Vy of the magnetic sensors with regard to a number of azimuths of the azimuth meter in geomagnetism having magnetic field components Bx and By, which are approximate equations representing relationships between the detected values Vx and Vy of the magnetic sensors and the magnetic field components Bx and By of the geomagnetism, and azimuth calculating means for calculating azimuth by selecting specific app

Abstract: A leveling assembly for setting a vertical prop comprised of inclined surface setting member 20 and horizontal surface forming member 30 wherein; the horizontal surface forming member 30 has a horizontal surface 32 to be adjusted as being horizontal and a first adjusting surface 31 formed by surface not parallel to horizontal surface 32, the inclined surface setting member 20 has a setting surface 21 facing a slope inclined surface 11 and a second adjusting surface 22 facing the first adjusting surface 31 formed by a surface not parallel to setting surface 21, and, the horizontal surface forming member 30 and inclined surface setting member 20 to be piled up to make the first adjusting surface 31 and the second adjusting surface 21 next to each other, and, the horizontal surface 32 to be horizontal to the slope inclined surface 11 by rotating relatively the position and changing degree between the horizontal surface 32 and the setting surface 21.

Abstract: The navigation device includes a compass module including a base, a permanent dipolar magnet mounted for rotation relative to the base so that the magnet tends to align with the earth's magnetic north, a disc having a display fixed with respect to the magnet, and a transparent cover fixed to the base and arranged over the display surface. The display surface has map indicia for a pre-determined geographic area, map indicia being oriented to define a direction of magnetic north with respect to the map indicia, the indicia being aligned with respect to magnet so that the direction of magnetic north with respect to the map indicia coincides with earth's magnetic north when the magnet is aligned with earth's magnetic north. The compass module is fixed in a housing having a slot from which a folded map of the pre-determined area can be withdrawn, one end of the map remaining fixed to the housing.

Abstract: The horizon attitude direction indicator includes a container having defined volume and at least one translucent surface portion, wherein said translucent portion includes a marking thereon indicating horizon, a first liquid of a first density occupying substantially one half volume of the container, a second liquid of a second density different from the first density occupying substantially one half volume of the container, and wherein the first liquid and the second liquid are substantially immiscible and the translucent portion is disposed in a manner to permit visual inspection of the liquids therein.

Abstract: A transit positioning device for use with a conventional manhole mount having an elongate vertical arm and an elongate horizontal arm orthogonally joined together at a joint. A transit holding platform is rotatably mounted to an end of an adjustable length elongate member which in turn is mounted to the horizontal arm of the manhole mount. Further, an adjustable length stabilizing arm is provided with one end hingedly connected to the vertical arm below the joint at a position spaced apart from the joint, and a second end hingedly connected to the horizontal arm at a position spaced apart from the joint.

Abstract: The invention relates to a template for renovating a first bathtub connected to an existing drain by cutting a hole in the first bathtub and inserting a second bathtub having a bowl, a deck and a drain hole, the template comprising: a reference frame; a drain locating member movable in relation to the frame; a level indicating means to indicate verticality of the drain locating member; a member contact point on the frame for contact with the drain locating member; a stencil means on the frame corresponding to at least a part of an outline of the rim of the bowl of the second bathtub; wherein the contact point and the stencil means are arranged so that when the drain locating member is vertical and in contact with the contact point, cutting the outline of the first bathtub according to the stencil will provide a hole which when the second bathtub is inserted will bring the drain hole adjacent with the existing drain.

Abstract: A method for calibrating the attitude of a compass in relation to the platform on which the compass is installed. The compass includes an attitude determining device and an optical sighting device and the compass is integrally mounted on a platform. The method includes the steps of determining the angle between the optical sighting device and the attitude determining device, determining the attitude between the optical sighting device and the platform, and determining the attitude between the attitude determining device and the platform.

Abstract: An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias modes. In a first embodiment, the compass is provided with deviation compensation by a closed loop system including measurement of the sensor output signals and an offset current strap for nullifying the vehicle deviation field. In a second embodiment, deviation compensation is provided by operation in an initial calibration mode and by operation in a normal compensation mode to adjust compensation, as needed, on a long term basis during normal operation of the compass. In the initial calibration mode, while the vehicle is being driven, the signal peak values are adjusted to a nominal earth field level by changing the offset current. Then, compensating signal reference values for each axis are determined as each peak for that axis is determined.

Abstract: Laser alignment methods and apparatus are disclosed whereby pipe and similar materials may be aligned. The methods and apparatus are adapted to be utilized on the end of pipe or other material and thereby using as a reference point that pipe or other material with the reference beam generated by the laser providing a center reference point from the pipe on which the laser is mounted. In a preferred embodiment, the laser apparatus mounting is threaded so as to be used in mating relationship with the ends of complimentarily threaded pipes. Another preferred embodiment utilizes caps of various sizes, adapted to be placed on a pipe end, with mounting means for the laser.

Abstract: A vehicle warning device presents a visual display of unsafe inclinations of the vehicle. A bubble level has a map thereon which presents a plurality of safety vehicle inclinations within its confines. The appearance of a bubble level adjacent the map perimeter the map readily indicates to the vehicle occupant that an unsafe inclination of the vehicle is about to occur so that corrective action can be taken. The map is constructed to reflect various angles of inclination of a vehicle depending on the slope of the underlying vehicle support surface and the angle of approach/departure of the vehicle up or down the surface.

Abstract: An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias modes. In a first embodiment, the compass is provided with deviation compensation by a closed loop system including measurement of the sensor output signals and an offset current strap for nullifying the vehicle deviation field. In a second embodiment, deviation compensation is provided by operation in an initial calibration mode and by operation in a normal compensation mode to adjust compensation, as needed, on a long term basis during normal operation of the compass. In the initial calibration mode, while the vehicle is being driven, the signal peak values are adjusted to a nominal earth field level by changing the offset current. Then, compensating signal reference values for each axis are determined as each peak for that axis is determined.

Abstract: A device is provided for leveling a wall-mounted fixture such as a picture frame. The device has a mounting element, which can be fastened to a back surface of the fixture at a suitable location, such as a corner. A retractable level formed of multiple telescoping cylinders is mounted with the mounting element. The level is movable between a hidden position and a viewing position. In the hidden position the level is retracted into a recess in the mounting element so that the level is substantially hidden from an observer viewing the fixture. In the viewing position the level is extended outwardly from the mounting element for use in leveling the fixture.

Abstract: A rearview mirror assembly is disclosed for use in a vehicle that includes a mirror housing, a mounting structure for pivotally mounting the mirror housing to the vehicle such that the mirror housing may be both vertically and horizontally tilted, a compass sensor disposed in the mirror housing and coupled to a compass processing circuit, and a tilt detector for detecting when the mirror housing has been tilted from a prior position and for generating and transmitting a tilt detection signal to the compass processing circuit. The compass processing circuit may then respond to the reception of the tilt detecting signal by compensating the compass reading and/or display or by recalibrating the compass.

Abstract: A vehicle height adjust control apparatus, incorporating a slope determination apparatus, has a vehicle speed sensor, a vehicle height detector that detects a rear vehicle height of a rear portion of a vehicle body and front vehicle heights at the right and left front wheel positions, and actuators for changing the front and rear vehicle heights. In a case where the detected vehicle speed or an acceleration calculated from the detected vehicle speed is small and where the difference between the detected front vehicle heights at the right and left wheel positions is small and the averaged front vehicle height considerably deviates from a target vehicle height, a microcomputer determines that the vehicle is on a steep slope.

Abstract: A method and apparatus for hydrostatic leveling including a pair of liquid filled containers connected by a liquid hose for equalizing static pressure in the mercury pools in the indicating heads and a gas hose for equalizing the gas or vapor pressure within the heads above the mercury. Each head has an internal float with a display gauge. The indicating heads have identical structures and thus when they are resting on the level surface they may be reversed in location without change in gauge indicator reading; any difference in the reading is a measure of out-of-level condition. An elevator is used to support one head while a mobile tool is used to support the other head. The elevator comprises a rigid body that is secured to a stable structure adjacent the object to be leveled and includes a vertically displacable set-off for supporting the head. The mobile tool includes a level system for insuring consistent alignment of the head to the object being leveled.

Abstract: A rearview mirror assembly is provided for a vehicle which incorporates a self-contained magnetic field sensor in the mirror housing. When mounted to a fixed pivot point in a single ball mounting bracket, the mirror housing pivots around the magnetic field sensor. When the magnetic field sensor is mounted within the mirror housing either to the housing or to the mirror, compensation for the rotation position of the mirror about a vertical axis is provided by an empirically predetermined compensation value whereby direct reading of the angle is adjusted by a processor or by mechanically mounting the field sensor at an angle representative of the compensation value. Other ways of rotation compensation are also disclosed. Compensation for tilt about a horizontal axis is provided by an elliptical compensation algorithm in a microprocessor.

Abstract: A ladder inclination indicator has a transparent thin-walled body shell defining a rearwardly open recess containing a pivot pin supporting a gravity actuated pointer. A keeper plate forms a partial closure for the recess and carries a label which cooperates with the pointer to indicate a position of ladder inclination. Layers of pressure sensitive adhesive adhered to mounting flanges on the body shell secure the device to the side rail of a ladder.

Abstract: A level indicator attachment for a power hand tool to indicate the angle of inclination of the tool for making cuts at a predetermined angle. In a preferred embodiment, the level indicator comprises a circular bubble level adjustably positioned in a housing and frame mounted to the tool by use of preexisting fasteners used in assembly of the tool. Adjustment of the bubble level in the housing enables the level indicator to be calibrated or adjusted for different angle cuts. The invention is particularly suitable for use in cutting plumb cuts on rafter tails during construction of a building.

Abstract: A frame includes a hanging surface adapted to be adjacent a wall when the frame is hung, and a front surface generally opposite the hanging surface. A level indicator is recessed within the frame and is visible when viewing the front surface of the frame. A removable cover plate is configured to conceal the level indicator from view. In another embodiment, the level indicator is visible when looking upward at the frame from below the frame when the frame is hung on a wall.

Abstract: A method and apparatus (10) for aligning a towed vehicle (12) with a towing vehicle (14) is disclosed. The method is implemented with an alignment apparatus (10) including a base (22) configured for attachment to the towed vehicle (12), a platform (23) rotatably mounted on the base (22), and a level device (24) mounted on the rotatable platform (23). While the towed vehicle (12) is connected to the towing vehicle (14), the platform (23) and level device (24) are rotated until the level device (24) is in its level position. This sets a reference height position for the towed vehicle (12). When it is desired to reconnect the towed vehicle (12) with the towing vehicle (14), the towed vehicle (12) is raised until the level device (24) is once again in its level position. In one embodiment, the alignment apparatus includes a base hingedly connected to a mounting bracket for permitting side-to-side leveling of the towed vehicle.

Abstract: An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias modes. In a first embodiment, the compass is provided with deviation compensation by a closed loop system including measurement of the sensor output signals and an offset current strap for nullifying the vehicle deviation field. In a second embodiment, deviation compensation is provided by operation in an initial calibration mode and by operation in a normal calibration mode to adjust compensation, as needed, on a long term basis during normal operation of the compass. In the initial calibration mode, while the vehicle is being driven, the signal peak values are adjusted to a nominal earth field level by changing the offset current. Then, compensating signal reference values for each axis are determined as each peak for that axis is determined.

Abstract: A method of determining whether a structure such as a bridge has been severely damaged by an earthquake or other disturbance such as a flood. The method is designed to be carried out by unsophisticated persons immediately after such disturbance so that unnecessary delays will not be caused by the closing of bridges and the like which are not severely damaged. The method involves affixing a target to one portion of the structural member such as a span and affixing a pointer on another structural member such as a column. Preferably the target and pointer are positioned in such a way that a safe or unsafe determination can be easily made by the viewer.

Abstract: The present invention provides a mechanical forklift level indicator. The level indicator includes a first arm pivotally connected at a first end to a body of the forklift and a second arm pivotally connected at a first end thereof to the forklift mast assembly. The first and second arms are pivotally attached to each other at their second ends forming an intermediate pivot. A reference arm is secured to the second end of the first arm to form a fixed angle therewith. The pivoting of the forklift mast assembly will thereby cause relative motion between the second arm and the reference arm indicative of the relative orientation of the forks of the forklift.

Abstract: A level indicator attachment for a power hand tool to indicate the angle of inclination of the tool for making cuts at a predetermined angle. In a preferred embodiment, the level indicator comprises a circular bubble level adjustably positioned in a housing and frame mounted to the tool by use of preexisting fasteners used in assembly of the tool. Adjustment of the bubble level in the housing enables the level indicator to be calibrated or adjusted for different angle cuts. The invention is particularly suitable for use in cutting plumb cuts on rafter tails during construction of a building.

Abstract: A housing includes a pendulum having a window registerable with either of spaced apart indicia depending on what side of a ladder a housing is mounted to indicate the ladder is positioned at a safe angle against a vertical support. Wording on the pendulum is readable with wording in the spaced apart indicia to further indicate the ladder is at a safe angle. The pendulum is pointed at its lower end to register with third indicia positioned between the spaced apart indicia to indicate that the ladder is on a level surface.

Abstract: Disclosed is a level indicator device for cranes. A sensor sending unit fixed to the crane base utilizes a free swinging pendulum with a tip which activates sensor portions on a sensor board. An out-of-level attitude of the crane tilts the sensor sending unit and thus moves the pendulum tip to contact a specific sensor portion defined by the crane attitude. The sensors are connected to circuitry including a programmable array logic chip which generates a signal representative of a binary number corresponding to the position of the particular sensor activated. A serial to parallel converter converts the parallel binary number to a serial number and transmits radio frequency signals with said serial binary number indicative of the pendulum position. The RF signal is received by a receiver indicator unit located in the operator control station of the crane. Circuitry converts the signals to indicator activating signals for an indicator panel on the receiver indicator unit.

Abstract: A compass for mobile parabolic antenna includes a compass sphere having a transparent shell with an elevation dial and a magnetic core encapsulated by the transparent shell with fluid filled therebetween with a bubble enclosed within the transparent shell and a directional mark pointing to a fixed direction on the magnetic core, an annular plate having a location dial and a satellite name dial provided on edges of the plate, a cover plate having a central hole and a plurality of arcuated grooves, and a base plate having a circular depression, a plurality of arcuated recesses corresponding to the grooves on the cover plate defined in the depression, and a central bore corresponding to the central hole on the cover plate so that the compass sphere can be secured within the central hole and the central bore and the annular plate can be rotatably received by the circular depression when the cover plate couples with the base plate.

Abstract: An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias modes. In a first embodiment, the compass is provided with deviation compensation by a closed loop system including measurement of the sensor output signals and an offset current strap for nullifying the vehicle deviation field. In a second embodiment, deviation compensation is provided by operation in an initial calibration mode and by operation in a normal calibration mode to adjust compensation, as needed, on a long term basis during normal operation of the compass. In the initial calibration mode, while the vehicle is being driven, the signal peak values are adjusted to a nominal earth field level by changing the offset current. Then, compensating signal reference values for each axis are determined as each peak for that axis is determined.

Abstract: An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias modes. In a first embodiment, the compass is provided with deviation compensation by a closed loop system including measurement of the sensor output signals and an offset current strap for nullifying the vehicle deviation field. In a second embodiment, deviation compensation is provided by operation in an initial calibration mode and by operation in a normal calibration mode to adjust compensation, as needed, on a long term basis during normal operation of the compass. In the initial calibration mode, while the vehicle is being driven, the signal peak values are adjusted to a nominal earth field level by changing the offset current. Then, compensating signal reference values for each axis are determined as each peak for that axis is determined.

Abstract: A level indicator for a child seat equipped with a rotatable carrying handle rotatably attached thereto, and having a housing in a hub of said pivotal handle with a wall defining an interior region of said hub and an indicator member having an indicator surface. The indicator member is movably received in the interior region and the wall is formed to include a transparent window defined by an edge formed in the wall, the edge being arranged so that the indicator surface is visible through the window when the level indicator is level, with the indicator member moving entirely away from the window edge when the level indicator is not level so that the indicator surface is not visible through the window. The indicator member is disclosed as being a gravity ball that freely rotates in a curved track or a pendulum rotating in the handle.

Abstract: A level indicating mechanism for indicating to a machine operator the relative level position of a work machine includes a circular ring magnet and a bullseye level instrument positioned within the ring magnet. A potting material surrounds the level instrument and connects it to the ring magnet. The level indicating mechanism is adapted to be removably secured to portions of the work machine and be visable to the machine operator. The angular orientation of the work machine is adjustable by stabilizing apparatus to bring the work machine to a level position with respect to the ground surface.

Abstract: An improved versatile tape measure tool is provided, which consists of an elongated strip of tape marked off in a linear scale for taking measurements. A casing is for storing the tape therein in a coiled spring biased condition with the tape being extendable through a first end wall of the casing for measuring. A plurality of components are built into the casing, to help in the measuring and cutting to size of plasterboard, so that the plasterboard can be used to cover interior walls and ceilings.

Abstract: A magnetic sensor mounting assembly embodying the present invention includes a base plate having cradles for pivotally receiving and adjustably locking a sensor supporting platform thereto. The base plate can be attached to an existing rearview mirror mounting member. The assembly further includes a cover providing access for adjusting the platform to a horizontal position and for allowing the rearview mirror mounting stem to extend therethrough.

Abstract: An electronic compass is described for use in vehicles. The compass employs a magnetoresistive sensor for sensing the earth magnetic field and the sensor is operated in alternate set/reset bias modes. The compass is provided with deviation compensation by a closed loop system including measurement of the sensor output signals and an offset current strap for nullifying the vehicle deviation field.

Abstract: A navigation device for personal use includes a face mask with a transparent window for binocular vision when the device is worn by the user. The face mask has a directional indicator attachement with a multiplicity of symbols to identify the directional orientation of the mask. The directional indicator is attached at a stable location and distance for continuous availability of direct binocular viewing.

Abstract: A terrain profiling apparatus for quick and inexpensive profiling of relatively large areas of ground. A prime mover pulls a sled across a terrain to be profiled. A gyroscope on the sled indicates slope and a measuring device records distances moved. Slope and distance signals are used by a computer to indicate terrain profile.

Abstract: A vehicle level and measuring and display device for use especially in recreational vehicles or the like for ensuring that the vehicle is in a gravitationally level position comprising a sensing unit remotely connected to a display unit. The display unit includes a plurality of incremental individual optical indicators disposed along a first line representative of the level position of the vehicle and a second line representing the level position of the vehicle whereby the individual LED optical elements can incrementally and individually display the particular level position of that line. The device includes at least two scales having both a rough and fine adjustment for the LED indicators.