Abstract: A wheeled attachment frame assembly that fits onto a floor buffer machine which permits the rider to ride, in a seated position, and to steer the buffer in any direction by the application of pressure on a handle of the buffer or on a foot pedal of the yoke assembly. The attachment frame assembly is formed of a pair of wheels mounted to a vertical seat support and to the rear of a horizontal pull bar, with the front of the pull bar joined to a U-shaped yoke member that is pivotably fastened to a bracket on each side of the top of the housing of the buffer. A transverse bar is mounted on the pull bar and formed on each side of the pull bar as a foot pedal rest. The floor buffer machine to which the unit is attached embodies a buffing wheel mounted in a horizontal plane above the floor surface to be buffed, enclosed by the housing to which a handle is fixed, and driven by an attached electric motor in the housing.

Abstract: A handy mop comprising a mop holder and a mop swab; said mop holder being composed of an integrally molded foamed product of a synthetic resin or an elastomer having independent cells inside thereof and a non-permeable continuous skin layer on the outer surface; said mop holder having a grip extending in the lengthwise direction at the central part thereof and a pair of mop holding parts having an arcuate tip and a horse-shoe-shaped bottom at both edges in the lengthwise direction integrally with said grip; said mop holder having resiliency and flexibility sufficient to deflect a pair of mop holding parts inwardly and downwardly; said mop swab being composed of an oval base cloth, a number of mop cords fastened to the lower surface of said base cloth and impregnated with a dusting oil composition, and a pair of pockets provided at the upper surface and at both ends in the lengthwise direction of said base cloth; a pair of said holding parts of said mop holder being inserted into the pockets of said mop swab t

Abstract: The invention is a double sulcus toothbrush having two groups of sulcus bristles which diverge at an angle relative to one another laterally of the toothbrush so that these groups may bear against the upper and lower teeth, inside or out, with the bristles entering the sulci at an angle appropriate for their cleansing, these bristles being optionally forwardly inclined, cut at a taper to facilitate brushing of the rear sulci or separated by a group of conventional bristles which are shorter than the sulcus bristles for brushing the crowns of the teeth.

Abstract: A paint brush is described. The brush has a handle and a ferrule secured to the handle. The brush also includes a plurality of bristles having inner end portions received within the ferrule and outer end portions which project from the ferrule. A bristle setting material retains the bristles within the ferrule. A plurality of elongate spacer elements are arranged inside the ferrule generally parallel to the inner end portions of the bristles. The bristles and spacer elements are tightly packed in the ferrule and the spacer elements are distributed between the bristles so as to mechanically and positively space the bristles and provide a predetermined bristle density. Paint brush manufacturing methods are also described.

Abstract: A handy mop comprising in combination (A) a mop holder including a grip, an upper holding plate and a pair of lower holding rods, all of which are integrally molded from a plastic material, each of said upper holding plate and lower holding rods extending in the horizontal longitudinal direction and having a closed end and an open end, said upper holding plate having a substantially horizontal flat lower face, said lower holding rods being disposed so that they are spaced vertically from said upper holding plate by a small distance and laterally from each other in parallel to each other by a small distance, to thereby form a horizontal mop passage between the upper holding plate and the lower holding rods and a vertical mop passage between the pair of the lower holding rods a pair of projections being disposed in the vicinity of the closed ends of the pair of the lower holding rods so that they narrow said vertical passage, and a mop-fixing engaging piece mounted on said mop holder at the position outside the

Abstract: A dip stick cleaning tool having a cylindrical body with flexible sides and removable ends. The body contains a core of absorbant, flame proofed, rolled material having an open center for receiving the dip stick. The top of the tool has an opening leading into the open center of the core and also has a pivotably mounted cover that acts with the side of the top opening to clean an inserted dip stick with squeegee action while the core wipes the dip stick and absorbs the wiped liquid. Inside the cylindrical body the core is spaced from the cylinder walls by a plurality of ribs to allow air to circulate around the core, and the core is spaced from the top of the tool by a plurality of pointed spurs to provide a space to hold liquid squeezed out of the core when the cylindrical body is squeezed while operating the tool.

Abstract: A wiper device for removing moisture from both flat and arcuate surfaces, such as the washed exterior surfaces of automobiles. The wiper device includes a handle and blade support, which have a unitary lightweight plastic construction, and an elongated flexible wiper blade secured to the support along one of its sides. The wiper blade is made of a relatively soft rubber stock material and extends out from the support a sufficient distance to enable the blade to conform closely to both flat and curved surfaces over which it is passed to facilitate the substantially complete removal of moisture from such surfaces.

Abstract: The arrangement is used for continuously cleaning surface-sensitive paper or film in web form. The arrangement may be installed at any point along the path of web travel. The cleaning effect is provided by a ribbon of fibrous nonwoven material which is guided over a suction roller together with the web to be cleaned. The ribbon of fibrous nonwoven material moves in the opposite direction to the web. A highly satisfactory cleaning effect is obtained by the high relative speed between the surface to be cleaned and the web of nonwoven material. The particles of dust and dirt removed from the web are drawn into the suction roller under the effect of the vacuum.

Abstract: An apparatus for skinning an animal is disclosed which apparatus permits skinning to be performed mechanically and comprises a roller table supporting the body of an animal and capable of moving in both elevational and tilting movements, a transfer and support table disposed adjacent the roller table, a guide roller disposed adjacent the transfer table, a cutter head mounting a cutter and juxtaposed against the guide roller for movement toward and away from the guide roller, and a pair of opposed rollers or two sets of endless chains disposed in a region beneath the line of contact between the cutter and the guide roller for pulling the skin stripped from the body of the animal by the cutter.

Abstract: A fish scaler comprises a specimen hold down plate and a scaler plate moveable toward and away from the hold down plate to and fro on a handle attached to the hold down plate and including manually operable scaler plate operating structure to guide the scaler plate on the handle and comprising an operating handle of modified oval-conical configuration to permit the scaler plate to have perpendicular as well as rotatable motion with respect to the guiding handle.

Abstract: Sheet support apparatus suitable for mounting sheet material is disclosed. The apparatus is especially useful for displaying information contained on paper or cardboard, or in brochures, etc.The apparatus comprises an elongated, rigid frame including three generally planar and integrally connected wall members spaced to define a cavity therebetween for receiving an edge of sheet material. Anchoring means, such as a leaf spring, are provided which can be inserted and removed from the cavity; the leaf spring cooperates with a shoulder on one wall member to anchor the sheet in the cavity.

Abstract: A clamp assembly for flexible duct of a type having a helically wound strip and a form-sustaining helically wound reinforcing member secured between lapping adjacent wraps of the strip. For reducing an end convolution of the duct, a one-piece spring wire clamp is provided having an operating arm and a lever arm connected in offset angular relation, opposite ends of the operating arm being mounted at opposite ends of an end convolution of the reinforcing member of the duct. The lever arm is movable into a closed clamped position engaging the end of the duct for effecting movement of the operating arm to contract the end convolution of the duct.

Abstract: A fastener structure which is especially desirable for use with laminated members such as graphite fiber members in which the fibers are secured together with an epoxy resin can be constructed utilizing a layer of a thermoplastic adhesive on at least one heat conductive functional part of the fastener. The fastener is preferably constructed so as to include a plate capable of being located against a surface of the member, a shank extending through a hole in the member and a holding part or element for securing the shank so that the plate is held against the surface of the member. The precise fastener used may be formed as a grommet, a rivet, a nut element or the like. Such a fastener can be constructed so as to provide corner reinforcement for the laminated member.

Abstract: A coupling element for a slide fastener comprises a head portion of substantially uniform thickness, and a coupling projection projecting from one surface of the head portion. A pair of tape edge clamping legs extend from the head portion in spaced-apart relation to each other. The legs have inner flat surfaces which face each other and are adapted to grip a tape edge in surrounding relationship therewith, and a pair of outer convex surfaces which face away from each other and with which a slider is slidably engageable when the latter is manipulated to open and close the slide fastener. Each of the legs is transversely tapered from the outer surface toward the inner surface to provide trapezoidal transverse cross-sectional shape thereof. A method of making the coupling element is also provided.

Abstract: A device for retaining reaped hands of tobacco leaves has two co-operating members formed from a length of spring steel wire bent back on itself. The hands of tobacco leaves are placed between the members which are gripped together by clips which are slidably mounted on one of the members. The clips can be engaged with the other member by a turning action, and can be disengaged by turning them in the opposite direction.

Abstract: Apparatus is disclosed for drying web-like material, such as knit material, being fed to a pre-shrinking machine such as a compressor. The apparatus includes a frame, at least one drying roller about which the web-like material passes in traveling from a first station to a second station, motive means for rotating the drying roller, and adjustable tension responsive control means controlling the speed and direction of operation of said motive means in response to the tension in the web-like material. The invention is particularly applicable in the situation where a pair of webs of different material are being processed by a single compressor and the necessity exists for accurately controlling the tension existing on both webs of material as it is applied to the compressor. In addition, a novel moisture applying unit is disclosed.

Abstract: A process for producing a composite novelty or effect yarn comprising a base thread and a fancy thread combined therewith in a texturizing jet nozzle having both an interlacing effect and a suction effect and operated between a low jet pressure and a high jet pressure, the low pressure being applied while the fancy thread is conducted through the jet nozzle under a lightly braked, lower tension than that applied to the base thread, and the high pressure being applied while the fancy thread is conducted through the jet nozzle under practically unbraked, tension-free conditions. The resulting product is useful as a doupion-type novelty yarn which provides commercially valuable effects in woven fabrics.

Abstract: There is disclosed a manufacture of a continuous hinge. The process is as follows. A metal strip is fed intermittently by a predetermined length towards a press-machining station where the strip is simultaneously cut and bent to form a hole, flap, swaged flap and loop during the stoppage of the strip. The strip having loops is cut into predetermined length to form leaves for a hinge. A pair of leaves are assembled by inserting a pintle through the aligned loops, and the assembly is reformed by roll means.

Abstract: This disclosure depicts a method for use in the manufacture of a rectangular shadow mask-type color television picture tube including a flangeless, curved faceplate having a central axis, a convex front surface, and a concave rear surface with a phosphor screen deposited on a central portion thereof. The faceplate also has four shadow mask suspension studs extending from the rear surface of the faceplate, one in each peripheral corner region of the faceplate, and a shadow mask suspended from the studs. The tube also includes a funnel having a central axis and a neck attached to a rectangularly cross-sectioned flared portion, the flared portion having a seal land which mates with the concave rear surface of the faceplate. The seal land has deposited thereon a cement for sealing the faceplate to the funnel.

Abstract: A cut off tool comprises an elongated support blade of uniform thickness adapted for mounting in a tool holder and having a head projecting above said blade at one end thereof. An elongated carbide insert having an undercut slot is mounted over the top of said head and is adapted for securing thereon. The insert is of uniform cross section having side walls which taper downwardly and inwardly, end walls which taper downwardly and inwardly and a top surface which is transversely concave along its length to define with an end face a concave leading cutting edge. An elongated lock body is loosely mounted upon and along the support blade and includes at one end a locking head defining a chip breaker and carbide insert lock. The body is notched at its forward end defining with said lock head a hold down part which overlies and retainingly engages said insert.

Abstract: A textile drafting roll assembly is illustrated wherein a cot carrying sleeve has a bearing race intermediate internally enlarged end portions for accommodating circumferentially spaced double roller bearings, sealing means being carried within the enlarged end portions retaining the roller bearings and excluding dirt and lint. A bearing cage is provided for receiving the roller bearings through spaced peripheral openings.

Abstract: A multi-partite guide roll which is especially usable in continuous casting installations has a plurality of axially arrayed discrete roll sections which are connected by stems so that they are compelled to rotate jointly about a common axis. The stems may either be provided at one axial end of the respective roll sections and extend into an axial recess of an axially adjacent roll section, or the roll sections may each have axial recesses at their opposite axial ends and the stems may be separate elements having two end portions each received in the axially aligned recesses of two axially adjacent roll sections.

Abstract: A yarn treatment unit including a tubular body having a helical groove on its inner surface and a plurality of orifices opening in the groove to impart a treating fluid on the yarn as it passes along the groove. The yarn preferably is presented to the treatment unit pneumatically and traverses the unit without applied tension along its length.

Abstract: A method for producing a generally bifurcated metal protective sheath for the edge of an aerodynamic blade comprising the steps of (1) providing a metal sheath mid-section element having a top and bottom surface, (2) covering the top and bottom surface with an aluminum bonding material, (3) laying up separate metal top and bottom sheath cover elements on each of the top and bottom surfaces of the mid-section element to cover and overhang the same, the aluminum bonding material having a solidus temperature lower than the solidus temperatures of the mid-section element and the top and bottom cover elements, and (4) subjecting the layup to heat and pressure in a die for a time sufficient to bring the temperature of the bonding material to a temperature which is below but within approximately 20.degree. F of its solidus temperature to solid state diffusion bond the mid-section and cover elements together without forming intermetallics.

Abstract: A hollow turbomachinery blade is formed by way of casting or the like with an open tip end except for a bridge which is formed integrally with the blade side walls at a central position with respect to the leading and trailing edges. Also formed integrally with the blade side walls, proximate the tip end openings near the leading and trailing edges, are a plurality of supporting and retaining bosses, the supporting bosses being in substantially the same plane as the cast cap, and the retaining bosses being disposed radially outward thereof. Each of the forward and rear tip caps is installed by placing it over the bridge ad then sliding it either forward or rearward to be captured by the supporting and retaining bosses and to thereby close the respective tip opening. Each of the tip caps is then brazed into position so as not to allow its sliding back out.

Abstract: A device for use in removing an individual cutting tooth from the reciprocating drive bar of a sickle mower. A substantially U-shaped guide is positioned on the two adjacent guard members of the sickle mower that are located on either side of the individual cutting tooth that is to be removed. A handle is pivotally attached to the guide. A hook member is pivotally attached to the handle at a location above the location where the handle is pivotally attached to the guide. The hook member is positioned so as to grasp a portion of the individual cutting tooth that is to be removed. A strut member is pivotally attached to the handle at a location below the location where the handle is pivotally attached to the guide. The strut member is positioned so as to engage a portion of the reciprocating drive bar adjacent the individual cutting tooth that is to be removed.

Abstract: The method for producing the transmission device including coupling means connected to a sleeve comprises forming a collar from an apertured blank of the coupling means and cold forming projecting portions on the outer surface of the collar for connecting the collar to rotate with the sleeve. The projecting portions may be formed by expanding the collar in a die from which die the collar is removed before connection to the sleeve. Alternatively, the projecting portions may be formed by radially expanding the collar in the sleeve whose inner surface has projecting portions which form the projecting portions of the collar upon contact with the collar during the expansion of the latter.

Abstract: A process for making a deep diode atomic battery embodies thermal gradient zone melting techniques for fabricating the structure thereof. Thermal gradient zone melting may also be employed to provide the battery with a radioactive source for energizing the battery.

Abstract: A voltage multiplier circuit assembly circuit is fabricated by the use of an apparatus which comprises a pair of guide walls juxtaposed on a horizontal insulative support, each of the guide walls having first and second slits in opposed relation to the corresponding slits in the other. The guide walls define a first and a second area and an intermediate area therebetween. Condensers of the wafer type is placed alternately on the first and second areas with one of their electrodes facing downward. Diodes having a pair of connecting leads are placed on the intermediate area alternately with the condensers and alternately through the first and second opposed slits. Conductive cementing agent is applied between the contact points of the condensers and diodes.

Abstract: In an induction machine having power windings disposed coaxially about the iron core thereof, means for reducing an axial mechanical force produced in any given winding by the interaction of the radial components of leakage flux produced at a time of short-circuiting and an electric current flowing in the given winding at that time. The reducing means includes a plurality of loops mounted respectively at the ends of the given winding and adapted to link the radial components of leakage flux produced at the ends of the given winding at the short-circuiting to generate induced currents in said loops. These currents produce magnetic flux for cancelling the radial components of leakage flux, respectively.

Abstract: An electric storage battery is disclosed having a case to retain electrolyte up to a given preferred level, cover means for retaining the electrolyte within the case, said cover means having defined therein at least one bore, said bore comprising at least one constricted section, probe means for sensing the preferred level of the electrolyte, said probe means being disposed through the cover, and resin means for chemically sealing at least a portion of said probe means with said cover means. In addition to the above, the present application discloses an inter-relationship between the remainder of the probe and the bore which allows for the introduction of resin between the surfaces of the probe and bore to create an effective seal between the probe and battery cover. Finally, a unique configuration of probe and bore is disclosed which produces a strong electrolyte tight seal between the probe and battery cover.

Abstract: This invention relates to a phono plug and a method of making it. An insulated disc through which extends a center contact member terminated to a center conductor of a coaxial cable is positioned in the inside surface of a U-shaped outer shell member and enclosed therein by closing the shell member into a generally cylindrical housing. An open barrel integrally attached to the shell member is either simultaneously or subsequently crimped around the braided shield on the coaxial cable to complete the phono plug.

Abstract: A method for producing tri-furcated electrical terminals including a series of parallel extending metal tines unitary with a base portion comprising the steps of first extruding a length of conductive metal to produce a plurality of spaced channels formed in the external surface, and joined by a central axial core. Next, the metal is cut into predetermined lengths to form a plurality of terminal blanks, after which the core of each terminal blank is partially removed by a rotating drill, axially aligned with the terminal to produce a plurality of separate tines supported on an integral base.

Abstract: A method of connecting electrical conductors and the connection obtained thereby wherein the extremity of a conductor is received within a sleeve which is in turn selectively inwardly deformed by lost punches which are initially aligned with the exterior of the sleeve and are driven inwardly to deform the aligned area of the sleeve into locking engagement with the flattened conductor, the punch itself locking within the sleeve.

Abstract: An elongated, substantially flat implement is integrally formed with a tubular coring portion at one end for removing core portions of a peeled citrus fruit, one or more cutting edges extending outwardly of one side of the implement at a central position therealong for peripherally scoring the rind of citrus fruit, and a rounded tip portion at the other end for insertion under the scored rind for wedging and prying the rind halves from citrus fruit before coring.

Abstract: A flat spring steel element has a handle portion, an offset shank portion, and a blade portion defining a symmetrically ground chisel edge. The edge is oriented at 45.degree. to the handle axis and each end of the chisel edge is ground to define two scoring tips. One of these tips has a 15.degree. forward rake angle when the tool handle is held perpendicular the surface to be scored, and the other tip has a similar rake angle when the tool handle is held at a slightly inclined position relative to such surface.

Abstract: A hole cutting apparatus which can be utilized to make holes in material which is of a tacky nature, including a hollow tube whose bottom edge is both chamfered and also cut at an angle with respect to the longitudinal axis of the tube. A knob is coupled to the top of the tube to form a handle. A hole in the top of the knob prevents a vacuum from being formed in the tube and also permits easy removal of the portion cut.

Abstract: In a vibration reducing system for a single cylinder engine, the rotating inertia forces are balanced while the reciprocating inertia forces are left unbalanced. The engine is mounted on a support by a spring biased linkage system permitting movement of the engine in a direction axial of the engine cylinder. The engine support also includes torsion mounts permitting controlled rotary movement of the engine about the crankshaft axis. Power transmission is through a drive shaft mounted on the support and connected with the engine crankshaft by a belt drive. The supporting linkage is biased to position the engine with the axis of the cylinder approximately normal to a plane defined by the axes of the crankshaft and the drive shaft.

Abstract: Orthodontic brackets and the like are adhesively secured to teeth by means of a self-curing thixotropic acrylic ester monomer composition wherein the monomer has been made thixotropic through the inclusion of fumed silane treated silica and wherein the acrylic ester monomer or monomers have two or more active acrylic ester groups, the thixotropic compositions prior to curing having a viscosity of about 85,000 cps to 4,385,000 cps.Prior to adhering the orthodontic bracket or other device to the tooth surface, the tooth surface is acid-etched, rinsed and dried. The thixotropic-activated monomer is then applied to the surface of the tooth or to the surface of the orthodontic bracket just prior to placing the bracket on the tooth.

Abstract: There is provided an ellipse drawing instrument the design of which is based upon the theory of orthogonal projection of a circle comprising a first leg having a pin point to be fixed on the surface to be drawn and a second leg having a drawing tip to be revolved around the first leg, the two legs being connected by a connecting member such as a pair of bars having parallel orientation and characterized as having the pin point end of the first leg extend upwardly as an axle and inserted into a sleeve. The top of said sleeve is rotatably mounted to an upper axle. The top of the upper axle, is pivoted with an inclinable axle which is inserted into a sleeve constituting a part of the L shaped connecting member of the second leg and functioning as a revolving arm. The top of the said sleeve is formed integrally with a turning wheel. The top of the inclinable axle is pivoted with a handle having a knob on it.

Abstract: A drafting machine is provided including a drafting frame, a continuous guide groove on the surface of the frame along each side thereof, spaced slide elements disposed in the groove and at least one drawing instrument pivotally connected to the slide element. Alternatively, a single slide element may be disposed in the groove with spaced bearing elements in engagement with an outer wall of the groove. The slide element or elements are connected to the drawing instrument through an elongated slot thereof so that the drawing instrument may be displaced longitudinally of and transversely to the guide groove.

Abstract: A shock-absorbing mechanism for use in a dial gage where longitudinal motion of the spindle is converted to rotational motion of a pointer shaft gear by a pinion shaft rotated by said spindle and a magnifying gear coaxially and idlingly meshed with said pinion shaft, comprising a star-shaped pressure spring with radiately extending, elastic branches having not only elasticity in the axial direction of said pinion shaft but also high rigidity in the rotating direction thereof, and a dished spring bearing to deform said pressure spring so as to provide said axial elasticity, said star-shaped pressure spring and dished spring bearing being disposed coaxially with said magnifying gear and a stopper ring fixed on said pinion shaft so that the magnifying gear is pressed against the stopper ring in a frictionally contacted manner.

Abstract: An all solid state gyromagnetic compass system operable in the slaved, compass and free gyro modes wherein magnetic compass error rates, fast or slow slaving rates, gyro drift rates, earth's rate and set heading rates are all produced by means of a solid state analog angle rate generator. This generator includes a dual slope integrator responsive to scaled d.c. voltages representing the required rates and which generate shaped sine and cosine control signals therefrom for the various system modes having constant amplitudes and variable frequency representing the required rates. The system outputs are provided in standard three wire synchro format for interfacing with any utilization system requiring conventional slaved gyromagnetic compass data, magnetic compass data or free gyro data.

Abstract: An apparatus and method utilizing an oscillating drum through which is passed a continuous web of textile fabric moved axially through the drum by synchronized drive means; the drum including confronting grid structures having angularly arranged portions which serve to prevent tangling the web as the web is moved forward and the drum oscillates. Hot air is introduced adjacent the entrance end and exit end of the drum and into the drum itself to maintain the web in suspension; and, optionally, live steam may be directed against the web before entering the drum.

Abstract: An arrangement is disclosed which is suitable for the treatment of particulate matter entrained by a gas, a preferred application being to the drying of particulate matter. The arrangement includes a treatment zone having an inlet region for the introduction of a stream of particulate matter which is entrained by a gas. Means defining a flow path for the substantially uniform entrainment of the particulate matter by the gas is provided upstream of the inlet region. The means includes a first section having an arcuate part and which communicates with a source of the gas. This first section has an upstream portion of circular cross-section and a downstream portion of rectangular cross-section and includes a region wherein the flow path cross-sectional area decreases in downstream direction.

Abstract: A wheel mounted grain drier for towing behind a farm vehicle or the like. The grain drier having a pair of horizontally mounted augers with perforated hollow auger shafts. In the drier the grain is conveyed along the length of cylindrical chambers by the augers as a gas fired blower vents hot air along the length of the hollow auger shafts and out the perforations thereby drying the grain as it is conveyed.

Abstract: A portable case that carries multi-subject quiz cards to which selected answers by a user are automatically noted as correct or incorrect which provides compact storage for a complete display unit when being transported and full display area when opened for all the necessary components of multiquiz cards, related pamphlets or posters and the electrical mechanism to indicate proper or improper answers. The cards have apertures adjacent the answers through which an electrical circuit probe may be placed to reach a panel in registry with the card, the panel having openings associated with correct answers so a light circuit may be closed but incorrect answers areas being covered with an electrical insulating medium to prevent closing the lighting circuit.

Abstract: A process is described by which macroscopic anatomical organ specimens are sliced into sections of equal thickness and arranged in a serial array within a transparent container for visual display. The process includes the steps of (1) suspending the anatomical organ within a block of transparent agar solution; (2) slicing the suspended organ and surrounding agar into sections of equal thickness; (3) pouring a liquid preservative into an upwardly open transparent container; (4) arranging the sliced sections in a prescribed array within the container; (5) pressing a transparent cover plate over the sections in the container to remove air from between the plates; and (6) affixing the transparent cover plate to the container to hermetically seal the sections and liquid preservative within the container under the transparent plate. The device for displaying serialed macroscopic sections of a sliced anatomical organ includes two planar transparent opposed plates.

Abstract: A system for demonstration of electrical circuits and components on a base of magnetic material including support housings for accommodating electrical circuit components and magnetic elements for mounting said support housings on said base and electrical conductors for connecting said components with each other providing electrical circuits.

Abstract: The specification discloses an electronic mathematics trainer including a problem sheet bearing a plurality of arithmetic problems. An arithmetic problem display holder receives the problem sheet and includes lamps therein for sequentially being illuminated to indicate sequential ones of the arithmetic problems to be solved. A keyboard encoder enables a student to manually enter the arithmetic problem presently illuminated on the problem sheet. A display unit displays the arithmetic problem which is entered into the encoder. Circuitry is provided to compute the correct answer to the arithmetic problem entered into the encoder, along with at least one incorrect answer. The incorrect and correct answers are displayed on the display unit. Structure is provided to enable the selection of one of the displayed answers. If the correct answer is selected, the answer to the problem is then displayed adjacent the displayed problem.