Abstract: A baffle is mounted in a ring having a beveled edge to facilitate movement in a direction normal to the plane of the baffle.

Abstract: In the particular embodiment of the device for replacing components in a front suspension of a vehicle disclosed in the specification, a work bench has two arms one projecting from each side and each having a mounting plate to be affixed to a wheel hub of a suspension mounted on the bench, and a pressure cylinder acts on the arms to lift the mounting plates and thereby compress the springs of the front suspension components to facilitate dismantling and replacement thereof.

Abstract: A method of repairing a water-cooled electrode holder for use in electric furnaces, of the type comprising a base and a bowl secured to the base for encompassing and supporting a vertical cylindrical electrode. Such holders suffer deterioration in the region of the inner surface of the bowl which is opposite the base. According to the invention, the outer semi-cylindrical portion of the bowl is cut off on a substantially diametral plane and replaced by a new portion. The new portion is formed from a flat slab of copper. To make the water passageways in the new portion match those in the old, a pattern of the locations of the passageways in the old portion is made and transferred to one end of the slab. The slab is then drilled lengthwise at the locations transferred from the pattern, and the holes are filled with sand and plugged. The slab is then bent to U-shape to comprise a semi-cylindrical portion having two straight ends thereon.

Abstract: The two coupling member supporting bands are led between a guide block and two clamping members in a vertical position and having the coupling members located at the lower side. The coupling members are aligned with the path of cutting members by means of a countersupport having two gripping members and positioned relative to the cutting members by means of a scanning apparatus. The clamping members clamp the supporting bands as well as the coupling members which are to be removed. After the coupling members have been clamped by the clamping members, the cutting members sever the coupling members at their foot section and thereafter the cut coupling members are pulled off the supporting band by means of the countersupport and the clamping members. This allows an impeccable cutting of the coupling members and that all cut coupling members can be drawn off the supporting band.

Abstract: A method for fabricating an MOS memory array is disclosed, wherein the method includes steps for constructing electrically-programmable and electrically-erasable memory cells (2, 198, 200) in combination with assorted peripheral devices (202, 204, 206) on a semiconductor substrate (8, 71). Tunneling regions (20, 78) are formed in the substrate (8, 71) and thin tunnel dielectrics (22, 84) comprised of silicon dioxide/oxynitride material are grown over the tunneling regions (20, 78) to facilitate transport of charge carriers between the tunneling regions (20, 78) and subsequently-fashioned floating gate structures (14R, 14L, 156) in the memory cells (2, 198, 200). A first layer of doped polycrystalline silicon is then deposited over the substrate and etched to define large polysilicon areas. An oxide layer is grown over the large polysilicon areas in a manner such that out-diffusion of the impurity present in the large polysilicon areas is prevented.

Abstract: A method for trimming the zero voltage Josephson current of a tunnel junction including the steps of measuring the I-V characteristics of the completed junctions to quantify the change in I.sub.o necessary to meet the design requirements, placing the tested Josephson junctions on a metal block which is mounted in the sample chamber of an ion implanter structure which is pumped to 1.10.sup.-6 Torr. The junctions, kept at room temperature and oriented at a direction nearly normal to the ion beam, are implanted with magnetically analyzed ions of energies 50 keV to 2300 keV. Spatial uniformity of the ion implant beam is .+-.2% over a sample. Uniform spatial implantation over a large area sample is obtained by either sweeping of the beam across the sample, or restoring the sample through a stationary beam, determining the required ion dose to effect trimming from calibration curves, remeasuring the I-V characteristics after implantation to confirm that the required I.sub.

Abstract: A lead frame for a molded semiconductor device package. The lead frame has a pattern of finger leads with convergent free inner ends and dam bars between adjacent finger leads. The dam bars are partially severed from their contiguous finger leads due to cuts on their edges intended to face a body member molded over the finger lead inner ends. The partially severed dam bar edge is preferably positioned to be substantially at the periphery of the molded body member. The resultant molded body member can thus have a finished surface even between the finger leads as molded and dam bar cutting die wear reduced.

Abstract: There is provided a method of producing a contact switching device comprising a step of pressing an electrically conductive metal sheet to form a lead frame having at least one relatively resilient contact member extending from one of the terminal portions and a stationary contact member extending from the other terminal portion, the relatively resilient contact member and the stationary contact member being disposed in mutually opposed and spaced apart relation, a step of bending external rim portions of the lead frame while the relatively resilient contact member is biased in such a manner that the opposed relatively resilient contact member and stationary contact member are brought together into partially overlapping relation, a molding step for forming an insulating base at base portions of the two terminal members, and a terminal-forming step of cutting the lead frame to leave the two terminal portions.

Abstract: Apparatus and method for installing electrical connectors onto flat conductor cables wherein the connectors are fed to the machine from a magazine, transferred from the magazine to a press, captured by the press and then pressed onto and through the cable over an anvil which holds the connector to form a secure connection with the cable. The resulting profile of the connector is such that it extends through the conductor of the cable and is held thereon by a flange on one side of the cable, an eyelet-type crimp on the opposite side of the cable and a lance means. The transfer means includes a connector holder which carries the connector from the magazine to a guide pin on the press. The guide pin captures the connector and retains it as the holder is returned to the magazine. The holder has two regions thereon and automatically switches their orientations as it approaches the press area.

Abstract: A shaving apparatus having a housing includes a trimmer movable relative to the housing between a latched position and an operating position. The trimmer comprises a holder, a pair of cutters arranged in the holder, and a slidable actuating button associated with the holder. A connecting element is secured to the actuating button and has oppositely extending resilient arms, the distal end of each such arm being formed as a latching member engageable behind a wall portion of the housing to hold the trimmer in the latched position. Each latching member has a cam surface inclined relative to the direction of movement of the actuating button and cooperative with the holder. The latching members are disengaged from the respective wall portions of the housing to release the trimmer for movement to the operating position upon movement of the actuating button.

Abstract: A shaving apparatus is provided with a shear plate having hair-entry apertures and formed with an inner surface, and a cutting unit associated with and drivable relative to the shear plate. The cutting unit comprises cutting elements extending towards the shear plate, each cutting element having an end surface facing the inner surface of the shear plate and being formed with a cutting edge, and hair-pulling elements respectively associated with the cutting elements and positioned in front of the cutting elements in the direction of driving, each hair-cutting element being rigidly connected to its associated cutting element and having a first end surface portion facing the inner surface of the shear plate and being formed with a contact edge. Each contact edge is situated at a greater distance than its associated cutting edge from the inner surface of the shear plate.

Abstract: A shaving apparatus comprising a shear plate with apertures and a cutting unit which is drivable relative to the shear plate and comprises a central body provided with cutting elements. Each cutting element has an associated hair-pulling element which precedes the cutting element in the direction of driving. Each combination of a cutting element and an associated hair-pulling element is formed by the limbs of a substantially U-shaped member of a sheet material which may be manufactured as a separate part.

Abstract: A wire stripper apparatus for stripping insulation from a coaxial type electric cable having a central conductor and a drain wire, which may be randomly located about the cable axis, includes piercing members to pierce through the cable insulation and pushing surfaces for pushing the drain wire out of the way of the piercing means so that during piercing and stripping of the cable insulation the drain wire is not damaged. The piercing members may be needle-like members having curved tips that pierce the cable insulation, on the one hand, and nudge, i.e. the pushing function, the drain wire out of the path of the penetrating needle-like members, on the other hand. The method is for stripping insulation of cable, especially of the aforesaid type, including such piercing and pushing steps.

Abstract: A travelling pipe cutter for cutting of pipe having a frame defined by a pair of spaced, interconnected plates with guide rollers thereon for movably supporting said frame for travel around a pipe, a gear box positioned between said frame plates and having a feed drive shaft extending from opposite sides thereof and through said adjacent frame plates, chain means extended around the pipe and drivingly connected to drive sprockets at opposite ends of said feed drive shaft, a cutter drive shaft extending from the gear box and through a curved slot in one frame plate and in spaced parallel relation with the feed drive shaft, the gear box being rotatable about the axis of the feed drive shaft relative to the frame to adjust the distance of the cutter drive shaft from the pipe, drive mechanism for rotating the drive shafts including motors mounted for movement with the gear box and gearing in the gear box which interconnects the motors to the drive shafts, and an adjustable connection between the frame and the gea

Abstract: An improved cutting head for a string trimmer, wherein a spool holding a length of flexible line is located on and driven by a motor drive shaft, and a housing over the spool is located on the drive shaft and driven by the shaft through the spool, this arrangement reducing the vibration experienced as the string trimmer is operated. The housing is attached to the drive shaft independently of the spool, allowing the spool to be quickly and easily changed, without the need for special tools, by unlocking and removing a hub portion of the housing, slipping the old spool from the drive shaft, slipping on a new spool, and reinstalling the hub.

Abstract: A weed cutting device having a double edged, rectangular, shaped blade that is attached to and in front of a toe boot that fits over a user's shoe.

Abstract: A pineapple cutter consists of a cylinder, a cutter portion and a pair of handles. In this case, the cylinder is adapted to punch an outer peel and an interior of the pineapple so as to separate both portions. The cutter portion is secured to the outer side of the cylinder and is adapted to cut the outer side peel of pineapple longitudinally. The pair of handles is secured to a supporting plate extends from the cutter portion integrally.

Abstract: A probe for sensing the position of an object relative to a reference point includes a contact tip extensibly mounted on a probe body by means of a piston assembly which transmits minimal force to the object through the tip after the tip contacts the object. The piston assembly includes a fluid driven piston which is normally spring biased to a retracted position. The tip is mounted on one end of a shaft which is slidably mounted on the piston so as to be displaced relative to the piston only after the tip contacts the object. The other end of the shaft forms the core of an LVDT which transforms linear displacement of the shaft into electrical signals indicative of the position of the object relative to the reference point.

Abstract: An error correction system for correcting machine errors or division errors in a position measuring instrument for precision machines is disclosed. The system is usable, for example, in conjunction with instruments for measuring the relative position of two objects, wherein an incremental grid division formed on a measuring scale is scanned by a scanning unit to generate analog measurement signals. According to this invention, the scale defines additional correction tracks which extend along the scale, parallel to the division, and are scanned by additional scanning elements included in the scanning unit. These additional scanning elements operate to generate analog correction signals from the correction track. These analog correction signals are used to correct the analog measurement signals with respect to errors such as amplitude errors, phase angle errors, and zero crossing errors.

Abstract: An improvement is disclosed for an encapsulated measuring device used for measuring the relative position of two objects. The improvement comprises a pair of sealing lips, each secured at one edge to a housing for the measuring device, and together covering an opening in the housing. The lips each define regions of greater flexibility adjacent to regions of lesser flexibility. A follower passes through the opening between the sealing lips. The sealing lips operate to maintain a seal for the opening while permitting the follower to pass between them. The lips are constructed such that openings adjacent to the follower are minimized or eliminated, and little frictional force is exerted on the follower if it moves in the opening along a measuring direction. The result is that accurate measurement is possible while intrusion of debris into the housing is largely prevented due to the seal.

Abstract: There is disclosed a template for providing multi-sided figures such as figures having 5, 6, or more sides.Essentially, the template is a planar member having a bottom apex. Directed from the apex, at a given angle, with respect to the horizontal, are two sides each of opposite slope. The member has a central vertical axis which is directed from the bottom apex and along which are a series of indicators spaced according to a desired length of a side. Positioned on the planar member are two slots which are parallel to the sloping sides emanating from the apex. Each indicator along the vertical axis is manifested by lines which are drawn from the indicator to the corresponding slot. In order to construct a polygon, the user emplaces a tack or pin through an indicator of the central axis to determine the length of the side and then marks the surface upon which the polygon is to be drawn by imprinting a mark where the connecting indicator line intersects the slot.

Abstract: A vehicle docking aid is disclosed in which a docking indicator is suspended by cord means attached to the door or wall of a garage. Intermediate hooking means are provided to raise the indicator out of the way when the garage is empty and the door is up. When hooked to the top of the garage door, the indicator is automatically disengaged when the door is lowered and the indicator thus returns to its normal position.

Abstract: A vehicle frame measuring and aligning apparatus comprises parallel rails with transverse reference members moveable along the longitudinal axis of the rails slideable vertical locating members are mounted on the rails. The apparatus also comprises an overhead measuring and alignment device which is slideably attached to the rails, with a vertically adjustable overhead bar to which referencing and measuring members attach. Clamping devices are used to secure the vehicle in place.

Abstract: The invention relates to a leveling arrangement for measuring the elevations above terrain points, in which a horizontal measuring beam originating from a distance measuring device searches a first deviating means and, after detection, a second deviating means. Both deviating means are perpendicularly arranged above terrain points marked by a stage each, which, in turn are provided with reflectors. The latter reflect to themselves the measuring beam directed by said deviated means upon said reflectors. Thus the measurement of the altitude of the different terrain points is converted into a distance measurement. The deviating means are triple reflectors, detectors can additionally be provided at the deviating means for detecting the measuring beam. The distance measuring device can be swingingly suspended on a vehicle.

Abstract: A guide clamp is disclosed which includes a clamping jaw at one end of a guide bar. An opposing shifting jaw is slidably carried on the guide bar to permit a workpiece to be embraced by the jaws. A pull rod associated with and parallel to the guide bar is connected to a lever on the clamp jaw. The shifting jaw locks onto this pull rod when the jaws embrace a workpiece and actuation of the lever then pulls the jaws together to clamp onto the workpiece and hold the guide clamp thereon. The shifting jaw will lock onto the pull rod by engaging a smooth-surfaced pull rod with a frictional grip or by engaging threads or notches on the pull rod with a locking grip. Guideways to guide and hold tools, jigs and the like are provided on the guide bar.

Abstract: A drafting tool for use in drafting or work layout is made of a pocket-sized piece of flat, transparent, rectangular material. The opposite edges are marked with full-scale and half-scale rulers and a center line is marked connecting the mid points of these rulers. This center line is perpendicular to both reference edges, and at least one of the rulers is marked with units in increasing dimension toward both ends of the reference edge starting with zero at the center line. The base line of a protractor is spaced inwardly from one of the reference edges and is parallel to that reference edge. The protractor itself is layed out in the form of a trapezoid, the top of which is parallel to the base line and the two sides of which slope inwardly from the base line toward the top at forty-five degree angles. The connections of these sides with the top is at an angle of sixty degrees with the base line measured at the origin on opposite sides of the center line.

Abstract: Disclosed is an apparatus for drying and calcinating coated welding electrodes with the use of induction heating, which comprises a sectionalized slot induction heater provided with a vertically arranged slot and a plurality of electroconductive bus-bars. Each bus-bar has a different vertical width but is supplied an electric current of the same magnitude. The electrodes are conveyed through the slot induction heater using a chain conveyer carrying magnetic holders for holding magnetically the electrodes. Adjacent to the terminal areas of the chain conveyor are disposed an arrangement for loading the untreated electrodes into the above conveyor and an arrangement for unloading therefrom the thermally treated electrodes.

Abstract: A clothes dryer comprising a stationary container with means for the passage of air therethrough, and a source of electromagnetic energy for generating microwaves through the clothing to dry the latter. A microwave stirrer in the magnetron wave guide randomly directs the microwaves for uniform distribution through the clothing and the frusto-conical shape of the clothing container cooperates to reflect the microwaves to enhance the drying operation.

Abstract: Method of and apparatus for use in drying materials in a dryer through which the material is conveyed and there subjected to heat which decreases from a maximum adjacent the infeed end of the dryer to a minimum adjacent the outfeed end thereof. A controlled small volume of air is forced towards the infeed end of the dryer from the outfeed end thereof and is repeatedly brought in contact with the conveyed material substantially without added air and with the percentage of moisture carried thereby increasing until, adjacent the infeed end, a high level of sensible heat is available to effect the heating of the material and the removal of its moisture which is carried through a heat exchanger in the exhaust. The heat is recovered from the moisture laden exhaust by the heat exchanger in a manner enabling the temperature of the air when exhausted, to be at a wanted level and the recovered heat used to increase drying efficiency.

Abstract: A fluid permeable fabric is disclosed having particular advantages as a dryer fabric for papermaking is disclosed. The fabric includes a number of helix A extending cross-wise in the fabric and joined together along the length dimension by pintles 38. Crevice spaces 40 formed by intermeshing bend portions extending into the loop openings C are closed by a contoured filler strip B. The contoured filler strip occupies the loop openings and includes contoured edges 56 which penetrate and occupy a substantial portion of the crevice spaces. A fabric having a low permeability is thus provided. An enlarged heat radiating surface 52 facing the paper side 39 of the fabric increases the heat transfer occurring in the paper web W to expedite drying. Crevice space 40 and tapered edges 56 of the filler element provide a guiding function which facilitates filler insertion in the loop openings.

Abstract: A solar drying device for drying wet material. The device includes an air-filled drying chamber adapted to contain wet material to be dried. A solar collector heats the wet material and air contained within the drying chamber. A dehumidification system includes a dehumidification chamber defined in part by an outer panel and an inner panel, the outer panel being in contact with the ambient atmosphere. The dehumidification chamber forms at least part of a wall of one of the drying chamber and the solar collector. Means are provided for directing warm, moist air from the drying chamber through the dehumidification chamber so that water from the moist air condenses on the outer panel. The air is then directed to one of the drying chamber and the ambient atmosphere. Means are provided for removing the condensed water from the dehumidification system.

Abstract: Apparatus for curing fibrous mineral insulation material comprises an oven, upper and lower conveyor belts for carrying the insulation through the oven, support means for supporting the belts, a supply plenum for directing curing gases through the belts and the insulation material, an exhaust plenum for receiving the curing gases, and a baffle positioned within the oven to define a curing gas flow path from the supply plenum through the belts and the insulation material to the exhaust plenum, the flow path being spaced apart from the support means to prevent contact between the curing gases and the support means.

Abstract: A mid-sole comprises a sole body of resilient foam material and a horseshoe-shaped rigid synthetic resin plate placed on the upper surface of the heel section of the sole body along the periphery thereof. At least one leg extends downwardly from the underside of the plate adjacent the inside portion of the heel section over its thickness to prevent the inner portion from inclining inwardly when a load is imposed on the inner portion of the heel section.

Abstract: Land grading apparatus comprising earth cutting blade mounted on wheeled carrier intended to be towed behind prime mover. Blade is fitted to elongate framework extending transversely of towing direction and comprising elongate blade carrier, two parallel tubes disposed above and to the rear of the blade carrier, two framework end structures and stiffening members. Carrier comprises a wheeled axle extending across apparatus behind the framework. Framework is suspended from a beam extending over midpart of framework longitudinally of towing direction. Beam is connected at front end to towing bar for connection to prime mover and is supported at rear end from the axle by hydraulic ram operable to raise and lower framework.

Abstract: The frame of an ironing press has flexible abutments made of steel against which a support for roller tracks rests in order to assure a stable position for a lever arm of the press when the press is in an open or closed position. The flexibility of the abutments of the frame make it possible to maintain stable positions of the lever arm during the ironing of fabrics of usual thickness or fabrics of greater than usual thickness.

Abstract: Biological material, such as a natural plant, is displayed within a transparent casing containing a preserving liquid which may consist at least partially of isopropyl alcohol. The material is attached either to a float or to a swivel anchor or to both so that, regardless of its weight, it is controllably suspended submerged in the liquid. The material is connected to the float or anchor, preferably by plastic threads substantially invisible in the liquid. The liquid in the casing is caused to move so that the biological material will rotate and afford a noticeable and aesthetic display. Music in conjunction with the rotation of the biological material may also be provided, as well as a light source for illuminating the display.

Abstract: An exhibiting device in the form of a cabinet having a base, side walls and a top wall extending across the side walls thereof above the base, the side walls thus forming compartments between the top wall and the base with open fronts for the compartment. Rotors are centrally and vertically disposed in the compartments and have at one end a conic termination for the rotor in the base and engage supporting means in the base receiving the conic termination, the rotors having at the other end a drive termination and a supporting member engaging the top wall. A panel configured as a regular polygon and constructed of rigid material is supported proximate the drive means on the rotor. A hanger is disposed centrally along each side of the polygon for hanging displaying panel members or advertising elements and located in such relationship that the displaying panel members occupy different planes spaced longitudinally of the rotor. A hinged convex curved member overlies the top wall.

Abstract: To provide a uniformly illuminated panel of essentially uniform brightness hroughout, although illuminated by essentially point source lamps, a box-like structural element (1) is provided having a light emitting surface (2) which has, in the direction of transmission of radiation therethrough, a ratio of reflection to transmission of radiation greater than 50%, and preferably between 80% to 95%, the interior wall surfaces of the hollow structure being reflective, and the hollow structure having a depth dimension, for example about 2 cm, which is small with respect to the height and width dimensions.

Abstract: A signal device includes a frame supporting a flexible sheet having indicia on one face. A plurality of oppositely disposed retainers are fixed to the other face of the sheet. A portion of the frame extends into each retainer to rigidify the sheet. Each retainer includes a movable member for controlling entry and removal of the associated portion of the frame.

Abstract: A hand-held, single shot weapon having the aesthetic function and capabilities of a writing instrument such as a ballpoint pen which can be actuated by pulling axially an end tip member against spring tension to quickly fire the weapon. The weapon includes interconnected threadable end and central body portions which allow complete safety of the weapon while it is being carried.

Abstract: A net-hauling, power-driven block, the frame of which is suspended from a trolley movable along a track extending between upward extensions of the frame sides. A hydraulic motor on the trolley drives a pinion which engages a sector gear parallel to the trolley track so as to vary the tilt of the block sheave as required to restore seating of the moving net in the sheave groove.

Abstract: An insect electrocution device comprising a lamp and an insect electrocution assembly disposed in generally surrounding relationship with at least a portion of the lamp. In particular, an insect electrocution device comprising a lamp for attracting insects and an insect electrocution assembly disposed about the lamp, the insect electrocution assembly comprising an outer apertured plate, the area of the apertures being substantially less than the remaining area of the plate, and inner electrode apparatus spaced from the outer apertured plate. There is also disclosed a combination illumination device and insect electrocution device including a lamp having peak outputs in both the UV region for insect attraction and in the visible region for effective illumination.

Abstract: An improved adhesive-type flytrap is disclosed having a rigid tube coated with a layer of a non-drying adhesive containing a fly attracting substance. A holder is provided in the form of an elongated plastic body member having mounting flanges at each end, between which the tube is held at its ends in a position alongside and spaced from the body member.

Abstract: A toy automobile which simulates both the appearance and performance of a modern hard top convertible. The convertible is provided with a unitary top piece which normally covers the cockpit of the car and is formed by top and side walls both joined to a rear panel. The rear panel is linked by a pair of flexible racks to a mechanism operatively coupled to the front wheel axle and adapted to swing open the top piece to expose the cockpit. In operation, when the convertible body is grasped by the player and the front is pressed down and pushed forward on a running surface, the top piece is caused to swing open, the vehicle when released by the player then continuing to travel in the forward direction. And when this same action is carried out by the player in the reverse direction, the top piece is caused to resume its normal closed position.

Abstract: A method and system for implanting a gift or message within a blooming plant includes removing a plug from the base portion of a plant bud to form a channel therein through which a gift or message is implanted within a central portion of the plant. The plug is replaced and sealed with grafting wax. Upon subsequent blooming of the plant, the gift or message is displayed to open sight.

Abstract: A door operator for opening and closing doors on transit vehicles and the like includes an actuator (50) secured to the transit vehicle (10). The actuator houses a worm drive and a reciprocating air cylinder (52) for imparting rectilinear motion to the worm drive. A door shaft (18) is coupled to a door (14) and mechanically coupled to the worm drive such that rectilinear motion of the system is transmitted by the worm drive into rotary motion to the drive shaft to open and close the door. A cam (90) is secured to the vehicle and adjacent to a cam follower (108) that is secured to the door shaft. The cam follower engages the cam during approximately the initial 80% motion during closing of the door and approximately the final 80% of the door opening. A recycling switch (200) for the door may be mounted in the vehicle adjacent to the cam in a position to be engaged upon engagement of the door with an object to recycle the door.

Abstract: A vertically adjustable window panel, especially for use in a door of a motor vehicle, which is arranged so as to be flush with the adjacent parts of the vehicle body and in which the guide means thereof as well as the window sealing means are disposed inboard of the window panel.

Abstract: An improved weatherstripping door seal of the bellows type comprising an aluminum flange holding a polymeric bellows unit which helps shield the flange from contact with one opening a door.

Abstract: A conditioner grinder having a workpiece carried by a car that reciprocates adjacent a grinding wheel. The grinding wheel is supported for movement in a direction both normal to the surface to be ground and transversely across the surface to be ground. Movement of the grinding wheel in both of these directions is through conventional hydraulic actuators. The hydraulic actuator indexing the grinding wheel transversely across the workpiece contains a pair of pressure sensors that measure the differential pressure across the piston of the actuator. The differential pressure signal is subtracted from a position error indicative of the difference between the actual position of the grinding wheel and the desired transverse position of the grinding wheel.

Abstract: A keel-tipped stylus for playback of video information from a disc record is formed on a lapping disc having a spiral signal track on the land between a spiral lapping groove. The respective pitches of the signal track and groove are different whereby the signal track and lapping groove cross each other. A playback stylus riding in the groove will detect a signal from the track to monitor the lapping process.