Abstract: An output/input coupler for multi-mode glass fibers characterized by a substrate and a main line having a square cross section disposed on the substrate and having at least one branch line extending on said substrate therefrom with the branch line having a rectangular cross section smaller than the cross section of the main line and having one surface coplanar with the surface of the main line. The branch line may have the same thickness as the main line with a reduced width or may have both a reduced thickness and width. In one embodiment, the branch line extends as an arc and may terminate in an end line which has a square cross section equal to the cross section of the main line and extends at an angle to the main line. In another embodiment, the branch line extends rectilinearly and may terminate in an end line which extends parallel to the main line and has a square cross section equal to the square cross section of the main line.

Abstract: A nonwoven, self-sustaining, absorbent fabric comprising a batt of randomly arranged, intermingled cellulosic fibers has a plurality of high loft, loosely compacted regions separated from each other by highly compressed regions. An adhesive material penetrates through the compressed regions to form bonded fiber networks extending completely through the batt, and said adhesive material only partially penetrates through said high loft regions whereby the fibers in the interiors of said high loft regions are unbonded by said adhesive so that said regions are highly absorbent. A method of manufacturing the above-described nonwoven fabric by moistening opposed surfaces of a loosely compacted, randomly oriented cellulosic fiber batt, embossing said moistened batt for providing a pattern in said surfaces, applying an adhesive to the patterned surfaces of the batt and setting said adhesive.

Abstract: Ribbons of unidirectional fiber-reinforced plastics material are prepared by laying the unidirectional fibers in parallel strips, alternating with strips of another material, onto a plastics material which is on a backing sheet, applying a second backing sheet to the upper surface, which sheet may also be coated with plastics material, applying heat and pressure, and removing one sheet of release material together with the said alternating strips of another material.The unidirectional ribbons left on the backing sheet are suitable for filament winding operations.

Abstract: Disclosed are an improved islands-in-a-sea type multi-core composite filament comprising at least two different polymer components and having a cross-section wherein each island is surrounded by some other islands and most of the islands have an approximately quadrilateral to hexagonal cross-section, and also a process for producing the above-said composite filament.

Abstract: 1. A process for forming a multiple-channel micro-tubular device comprising the following steps:Assembling a plurality of individual tubes of heat deformable material into a closely packed array of a predetermined cross section;Applying heat to said array to fuse said tubes into a unitary honeycomb structure;Drawing said heated structure to reduce its cross section by at least an order of magnitude;Cutting the drawn honeycomb structure into segments of a predetermined length and entrapping gas in each of the component tubes of said segments at a predetermined temperature below the fusion temperature of said material;Packing a plurality of said segments together to form a cluster;And heating said cluster to a temperature above said predetermined temperature to fuse them into a unitary structure without collapsing said tubes.

Abstract: A method for manufacturing a rigid, perforated cloth wherein the cloth is woven, in both the warp and weft directions of core yarns wrapped with a thermoplastic covering yarn. After weaving, the cloth is subjected to heating at a temperature greater than the melting point of the thermoplastic covering yarn. The cloth is thereafter cooled, thereby imparting rigidity to the perforated cloth.The product of the present invention is a rigid, perforated cloth in which the individual yarns of the cloth comprise a core yarn that is covered with a thermoplastic cover. The rigid, perforated cloth displays reinforced structural networks due to the plasticity of the thermoplastic material and enhanced resistance to physical and chemical degradation.

Abstract: A fibre bundle is first formed from loosely entangled fibres. Then, the fibre bundle is encased in a plastic shell and dipped into a solution of a synthetic resin in a solvent to fill the spaces among fibers with the solution. After taken out of said solution it is left to stand for a period of time during which the volatilization of the solvent forms a great number of capillary passages for the transudation of ink. After grinding a marking pen is obtained having a nib and an ink reservoir integral therewith.

Abstract: An improved fibre-optic cable termination which substantially reduces light losses and also facilitates cable termination in the field as opposed to the factory.According to this method the fibres are compressed by pushing the bundle, preferably sheathed in a thin glass ferrule, into a heated tool having a tapered hole. A protective metal coupling may be incorporated by heating a metal sheath with a tapered bore and pushing the glass sheathed bundle into the metal sheath. The metal sheath may then constitute a pin of a pin and socket optical coupling.In all cases the temperature and pressure are adjusted so that the individual fibres are squeezed into approximately hexagonal form so as to eliminate the interstices to a substantial extent. The temperature and pressure are, however, limited to prevent any substantial fusion and coalescing of fibres and consequent loss of the optical barrier between them.

Abstract: An end portion of a bundle of thread-like bodies to be set is dipped into a solidifiable liquid. At least a part of said bundle, adjacent to the predetermined level of the solidifiable liquid, is contacted with a specific liquid or gas which substantially prevents wicking of said solidifiable liquid along said thread-like bodies due to capillary action. The solidifiable liquid is not drawn up through the bundle beyond predetermined level of the solidifiable liquid, and solidified at the predetermined level.

Abstract: A method of making an optical coupling between a first dielectric optical waveguide and a second dielectric optical waveguide comprising, launching light into one of said first or second dielectric optical waveguides, moving an end of said first dielectric optical waveguide towards an end of said second dielectric optical waveguide, observing light radiated from the end of said first dielectric optical waveguide, and when said radiated light reaches a minimum value, fixing said first dielectric optical waveguide relative to said second dielectric optical waveguide to form a permanent coupling.

Abstract: An improved solvent welding primer is described for use particularly in the assembly of polyvinyl chloride pipe and fittings to themselves or polyvinyl chloride pipe or fittings to acrylonitrile-butadiene-styrene pipe or fittings. The primer consists essentially of an organic solvent containing an amount within the range of from about 0.5 percent by weight to about 2.5 percent by weight of an unplasticized polyvinyl chloride resin dissolved in the solvent. The solvent is a mixture of tetrahydrofuran and dimethylformamide having a weight ratio of THF to DMF within the range of from about 1.64:1 to 1:1.

Abstract: A fibre bundle is first formed of entangled fibres by use of a tapered mold of an extruder. Then, the fibre bundle thus formed is dipped into an urethane prepolymer to fill the spaces among fibres by impregnating it with said prepolymer. After removal from the liquid prepolymer, it is left for a period of time to allow the reactions among the constituents in the prepolymer and the volatilization of solvent generate gases to form gas escape holes or capillary passages along the length of the fibre bundle.

Abstract: A method for sealing together the ends of concentrically arranged tubes of plastic material to make a double-walled tube which comprises inserting the assembled ends into a mold means conforming substantially in size to the outer periphery of the finished tube and applying heat to seal the tube ends together. Preferably, the tubes during heating are arranged concentrically with the end of one tube extending beyond the end of the other tube and if the materials of the two tubes have different melting points, the tube having the lower melting point extends slightly beyond the other tube. Preferably, a rod of material having good heat conductivity and a melting point higher than that of the plastic tubes is positioned inside the inner tube with its end slightly below the sealing area. The tube edges can be sealed together leaving an opening in the finished end or the finished end sealed completely over.

Abstract: A process of forming an emboss on textile material such as blankets, bedspreads and the like wherein areas to be unembossed are outlined on the textile material preferably after the textile material has been washed, subsequently treating the outlined areas with a resinous material preferably having additives such as an affixer and a softener which is subsequently permitted to cure and performing a teazeling operation on the textile material to remove the nap from the untreated areas and finally subjecting the teazeled textile material to a finishing operation to provide a smooth teazel nap of the desired length on the textile material.

Abstract: A high loft, low density, nonwoven fibrous material is provided comprising two layers of irregularly arranged, intersecting, overlapping, mechanically interengaged, loosely assembled fibers, one of the layers including thermoplastic synthetic wood pulp fibers at least in the portion thereof at the interface to the other layer, at least some of the thermoplastic synthetic wood pulp fibers in the one layer being in contact with and fused with segments of fibers of said other layer.The material is produced by air-laying the aforementioned layers successively so that some thermoplastic synthetic wood pulp fibers in one layer are in contact with some fibers in the other layer, and then applying heat without pressure to fuse and bond at least some of the thermoplastic synthetic wood pulp fibers in one layer to fibers in the other layer.

Abstract: A method of preparing narrow ribbons of unidirectional, fiber-reinforced plastic material, particularly suitable for filament winding operations, involves using a series of spaced discrete parallel strips of fibers and a plastics film, heating under pressure, and removing surplus plastics material from between each strip by application and removal of a continuous sheet.

Abstract: A gas impermeable hollow silicon carbide body is formed by slip-casting two separate hollow silicon carbide bodies, the two separate bodies are then cemented together by means of a silicon carbide slip and then the joined pieces are fired at a temperature sufficiently elevated to recrystallize the cast bodies and to form a recrystallized joint between the two pieces, thereafter the body is subjected to a silicon atmosphere to deposit sufficient additional silicon in the body to provide a structure which is essentially impermeable to gases.

Abstract: A method for producing porous graphite for use as bone replacement with a structure for osteon penetration. Graphite is produced with ordered circular pores of 100 to 1000 microns in diameter covering at least 25% of the exposed surfaces. A cylindrical fiber is coated with a carbon flour-pitch mix and is then wound on a bobbin in a predetermined manner. The product of winding is dried, pressed, carbonized, and then graphitized. The fibers are removed either chemically or by volatilization during carbonization or graphitization.

Abstract: A collimated hole structure formed by constricting a plurality of tubular elements each provided with a core for supporting the tubular element during the constricting operation. The bundle of elements is constricted to a point where the elements effectively fuse into a substantially monolithic body. The cores are then removed, leaving a plurality of extremely small diameter, generally parallel passages in a solid body. The tubular elements may be arranged in any desired array, and thus the passages may be provided similarly in any desired array. The passages may have high aspect ratios and may be closely juxtaposed. In one illustrative application, the collimated hole structure is provided with dielectric film and utilized as an anode portion of an electrolytic capacitor. In another illustrative application, the collimated hole structure is utilized as a tip for a drilling device.

Abstract: A substantially closed fabric with a soft hand is made by compressive redistribution of the filaments of at least some of the yarns of an open mesh fabric. In order to achieve the desired result, certain characteristics of the yarn and the fabric are necessary and are disclosed, e.g., continuous filament yarns having not more than one turn per inch, a fabric having a denier per inch of at least four thousand and a thermoplastic coating with a softening point less than that of the filaments. The thermoplastic coating is resoftened to the point where the filaments are capable of being spread apart. Compressive pressure then is applied to achieve this result. The redistributed yarns then are held in their new position until the thermoplastic coating has set to at least the point where it is capable of holding the filaments.

Abstract: A method of fabricating heating structures in which a heating wire having a thermoplastic outer layer is arranged in a predetermined pattern and one or more strands of thermoplastic material are applied to the individual sections and bonded thereto. The area near the bond is heated to a temperature sufficient to fuse the surfaces of the wire and strand or strands and, after the wire and strands have cooled, the strands adhere to the sections, thus forming an integrated heating structure from the separate heating wire sections and thermoplastic strands. The sections may be parallel to one another and the strands applied thereto in substantially right angle relationship, and when a number of strands are applied to the wire sections, they normally are applied simultaneously and in parallel relation.

Abstract: A method of manufacturing of a novel very fine seamless heat resistant synthetic resin tube having a wall thickness of not more than 0.3 mm, by applying a specific heat resistant synthetic resin varnish as defined in the specification on a metal wire and curing said resin varnish to form the synthetic resin layer on the metal wire, drawing the heat resistant synthetic resin coated wire above the yield point of the metal wire and separating the resulting synthetic resin tube from the metal wire.The method of the present invention may produce a composite heat resistant synthetic resin tube in which a plurality of the above-described tubes are made to adhere tightly parallel with each other in the longitudinal direction or a double layer resin tube, one layer of which is a thermally adhesive synthetic resin and the other layer of which is the heat resistant resin.

Abstract: A method of assembling an all-plastic valve that assures proper positioning of the associated parts while forming a unitary, leaf-proof valve body.

Abstract: Sheaths for covering battery electrodes are produced by introducing inner and outer layers of sheath material onto a plurality of adjacent mandrels. As the layers pass along connector sections of the mandrels, they are connected together to form interconnected tubes. The connector sections have an elongate cross-sectional configuration to facilitate such connection. Thereafter, the layers pass along reshaping sections of the mandrels which have a cross-sectional configuration that is different from that of the connector sections and which corresponds to the desired final shape of the tubes.BACKGROUND AND OBJECTSThe present invention concerns the manufacture of a type of sheath for tube electrodes used with electrical accumulators or batteries; it comprises two layers. One of the two layers, the actual or inner sheath wall, comprises a layer of fibrous material, preferably glass fiber. The sheaths comprise another layer outside the fibrous material.

Abstract: Three-dimensional impregnated filamentary materials and methods for making the same.

Abstract: Mating pairs of arrayed optical fibers are axially aligned and abutted preparatory to splicing, by being urged down an inclined guide ramp and into respective fiber receiving grooves. The splice is completed by applying index matching material and a splice connector plate to the abutted joint.

Abstract: Method and apparatus for bubble shearing are disclosed in which nascent bubbles are formed by flowing gas through the very small capillary openings of a gas diffusing surface into a moving liquid that shears the nascent bubbles off as it moves past the capillary openings. In the apparatus disclosed, the gas diffusing surface forms one wall of a liquid transmitting slot through which the shearing liquid flows as it shears off fine gas bubbles.A gas transmitting body or gas "bar" for use in the bubble shearing apparatus is disclosed. The gas transmitting body has at least one wall with a plurality of gas transmitting passages extending therethrough terminating in capillary openings. The maximum size of the capillary openings is given, as well as the maximum distance of the most remote capillary openings from an edge of the gas diffusing surface defining one boundary thereof. Improved and preferred values for these parameters are also given. Other structural features of the gas transmitting body are disclosed.

Abstract: A high-strength parallel yarn rope comprises a series of multi-filament rope yarns which are bounded together in parallel relation along their lengths by a binder distributed only on the surfaces of the yarns to form a flexible rope core. The core is surrounded by a braided jacket, and a flexible layer of water-impervious material adhesively and mechanically bonds the core to the jacket.A method is also disclosed for manufacturing the rope.

Abstract: Metal fastener sticks wherein the individual fastening elements, such as staples, on the stick are secured together by a radiation cross-linked polymer, and which metal fastener stick is prepared by: coating the metal fastener stick with a solventless, radiation -curable, polymeric composition, such as an ultraviolet-curable formulation of an unsaturated resin, a monomer and a photo initiator; and curing the composition by exposing the composition to radiation, such as ultraviolet radiation, to provide a metal fastener stick wherein the individual fastener elements are secured together in the stick through the radiation cross-linked polymer.

Abstract: The production of a bonded glass fiber product is disclosed. The steps of the method involve forming glass fibers from molten streams of glass; combining the glass fibers with a heat curable aqueous binder composition; consolidating the fibers and heat curable aqueous binder composition into a loosely packed mass on a foraminous conveyor; and curing the heat curable binder composition in situ on the glass fiber product. The consolidated fibers can be compressed on the foraminous conveyor prior to or during curing of the binder composition, or both. The binder composition comprises:1. 60-95 percent by weight of a complex polymeric component formed by reacting phenol, formaldehyde, a modifier selected from the group consisting of starch and compounds which are degradation products of starch, and urea,2. 10-80 percent of urea based upon the weight of the phenol originally charged to produce the polymeric component,3. 0.

Abstract: A process for continuously bonding staple fibers into an essentially non-twisted yarn comprising the steps of introducing into a fiber arrangement composed of staple fibers an excess of a liquid containing an adhesive in distributed form, squeezing excess liquid out of the fiber arrangement, compacting the fiber arrangement by applying pressure to form a moist slubbing, and for setting the adhesive and transforming the slubbing into a bonded yarn bringing into contact as by feeding the slubbing into a condensing vapor atmosphere.The yarn produced according to the aforementioned process, compared to a yarn set in dry air with the same quantity of adhesive, possesses a higher breaking length and rupture or break elongation and a smoother surface.

Abstract: There is described a method for forming high modulus, high strength, low density solid tapered composite rods suitable for use as fishing rods and the like.

Abstract: A conjugate polycarbonate fiber comprising 95% to 50% by weight of a polycarbonate component and 5 to 50% by weight of a polypropylene component wherein ultrafine fibers composed of the polypropylene component are dispersed and arranged in a bundle-like form in the polycarbonate component as the fiber matrix, whereby the crazing resistance and oil resistance are improved. The conjugate polycarbonate fiber can be made into fibrous sheets and non-woven fabrics. The non-woven fabrics are adapted to be used as insulating layers in electric power cables.

Abstract: A heat exchanger of the type having header tanks connected by a number of tubes of heat conductive material which extend between the tanks and which communicate with the tanks by passing through holes in a collector plate forming a wall of each header tank, wherein the collector plates of one or both tanks is formed of a resin compound separated from the interior of its tank by a membrane of a plastics material through which the tubes pass and which is sealed around the tubes, the resin collector plate being bonded to the tubes.

Abstract: An apparatus and method of using same to form tubular tapered shafts particularly adapted for golf clubs, ski poles, fishing rods and the like. The material used in forming the shafts is a thermo-setting resin sheet that has a number of elongate, laterally spaced, parallel fibers of graphite carbon, boron or like material therein, which fibers have a tensile strength comparable to steel, but are only a fraction of the weight of the latter. The apparatus and method of using the same is characterized by the tubular shaft being formed with exterior and interior cylindrical wall surfaces that are truly concentric, and with the fibers embedded in the polymerized resin being pre-tensioned and spaced from one another.

Abstract: Heat-fusible hair-like fibers, disposed as a tow in a flat manner, are provided a narrow common bond by being thermally fused together transversely to the direction of the tow, such fused bonds being provided at increments along the length of the tow to sever such increments from the tow, the bonds being split lengthwise of the bonds and the increments being mechanically severed intermediate the bonds to provide flat bundles of hair-like fibers whose strands lie in a generally common direction and which strands have a narrow common bond at only one end. The bond is brittle and the user is readily enabled to separate a portion of the fibers as a unit from the article for use, for instance as a fishing lure component.

Abstract: The invention relates to a method of joining components made of cross-linked polymers, at least one of the components being a tube, which method comprises deforming at least one of the components so as to deviate from the cross-linking shape, inserting an end of the tube into the other component, and heating the joint location to the temperature where the deformed components tend to return to the cross-linking shape, the heating being maintained for a time sufficient to produce fusing together over the joint location.

Abstract: A thermoplastic coupler sleeve for interconnecting tubes or pipes is made by extruding thermoplastic material, e.g., polyethylene, to make a ribbon, and wrapping the ribbon around a heater coil in as many layers as needed to obtain the sleeve.

Abstract: A fibrous body which includes at least two layers of strands of continuous filaments and binder particles in each layer. One of the layers has filaments of the strands therein at least partially dispersed to form a mesh size which entraps binder particles therein which have a mesh size larger than the mesh size of the dispersed filament layer, as well as smaller size particles lodged at intersections and crossovers. Another layer has strands which form a mesh size which do not necessarily entrap binder particles but may retain particles therein at interstices of strands. The fibrous body has a binder content in the dispersed filament layer which is larger per unit volume than the binder content of the other layer. Preferably a plurality of successive layers of continuous multi-filament strands are deposited on a collecting surface in a mat-like mass.

Abstract: Disclosed is an apparatus and method for connecting a fitting to a side wall of a pipe. The apparatus includes a frame comprising two ring clamps for mounting the frame on the pipe. Guide rods extend perpendicularly and outwardly of the pipe. A base plate is slidably mounted on the guide rods for movement relative to the pipe. A receiving member on the base plate is adapted to receive the fitting to be joined to the pipe. A top bar is fixedly attached between the ends of the guide rods remote from the rings. A threaded shaft is positioned with one end attached to the receiving member and with its second end passing through the top bar. Within the top bar are means for selectively engaging the threaded shaft so that the shaft may be translated through the top bar by turning the shaft. Alternatively, the shaft may be disengaged from the top bar whereby the shaft may be moved freely through the top bar.

Abstract: A machine for fabricating heating structures having heating wires with an external layer of thermoplastic material arranged with sections in a predetermined pattern, and carrier strands of thermoplastic material fused to and interconnecting the wire sections. The machine includes a wire support means having laterally spaced pegs or the like on which the wire is retained in a predetermined configuration on a substantially common plane. A heating unit or units simultaneously heat the carrier strands and wire sections together. The heating elements and wire configuration are moved relative to one another to join progressively the strands to the transversely arranged heating wire sections. The element used in the heating unit includes a guide trough for the carrier strands and simultaneously heats facing surfaces of the strands and heating wire so that the two can be pressed together while fused to form the bond.

Abstract: In a method of manufacture of composite materials consisting of carbon fibers and resin, a polymer is fixed on carbon fibers by means of a chemical bond and the fibers thus coated are then incorporated in a resin which is compatible with the polymer.

Abstract: A composite strand of thermosetting synthetic plastic resin reinforced with fibers of conductive or semi-conductive material is produced by a pultrusion machine and process which forms and impregnates the composite strand and pulls it through the stage of impregnation, followed by curing, and forming. At the impregnation stage liquid thermosetting resin is mixed with hardener and the fiber strand saturated with the mixture and rough formed. During the initial curing stage a cure is started by heating the fibers by use of inductive electrical wave energy and the heated fibers in turn heat the resin. Before final curing, the saturated strand is pulled through the finish die where it may be externally heated and wherein the saturated strand is given its final cross-sectional shape and external finish, and cured to completion immediately prior to final emergence at the exit end of the finish die.

Abstract: An elongated structural member formed of bonded directionally-oriented wood strands. The member is rectangular in cross section, having a width between longitudinal side edges and thickness between parallel longitudinal faces joining the side edges. Oriented wood strands are utilized to form the member, with flange sections extending inwardly from the side edges and a web section extending between the flanges. Strands within the flange sections are longitudinally oriented parallel to one another and to the face and edges of the member. Strands within the web section are skewed relative to the strands within the flanges. At the interfaces between the flange sections and web sections, strands are disposed with angular components complementary to strands found in both the flanges and web section. The rectangular configuration of the member facilitates its construction by conventional pressing equipment and techniques.

Abstract: A fabric, a method for its fabrication and an apparatus for its manufacture where a group of parallel yarns are fused with another group of parallel yarns perpendicular to the first group of yarns at predominantly lateral or peripheral portions of the resulting junctions by a high frequency current.

Abstract: Corrugated plastic tubes simultaneously feeding from a plurality of sources are doffed, stacked in nesting relation and formed into bundles of a predetermined number of tubes in accordance with the present invention. The corrugated plastic tubes are produced in continuous length in separate production lines, cut to predetermined lengths, and fed along predetermined paths to respective doffing stations where the tubes are doffed into a common hopper positioned adjacent the doffing stations. Upon a predetermined number of the tubes being doffed into the hopper and accumulated in stacked and nested relation, the tubes are advanced to a bundling station where strapping machines secure pliable strapping elements around the stacked and nested tubes to form the same into compact bundles. The bundles are then removed from the bundling station ready for shipment or storage.

Abstract: A method of manufacturing an open cellular article constructed of a plurality of spaced walls of relatively weak bondable material defining a plurality of elongated passages therethrough which are filled with a disintegratable filler material having sufficient form and strength initially to maintain the walls in their predetermined precisely spaced relation and after bonding of the walls into an integral unit such filler material being conveniently removable from the article to reestablish the passages between the walls.

Abstract: The novel embodiments disclosed herein also illustrate a novel method for making a recuperator structure. First and second pluralities of layers of elongated tubes are provided which are formed of a glass that is thermally crystallizable to a low expansion glass-ceramic. Each of the tubes is filled with a fluid medium that is expansible in response to the application of heat and the tubes have sealed ends to retain the expansible fluid medium entrapped therein. Each of the tubes has an essentially straight central portion and header connector portions continuing from each end of the central tube portions to the sealed end of the tube. The header connector tube portions of the first plurality of layers diverge away from the header connector tube portions of the second plurality of layers at the ends of the central tube portions when the first and second layers are placed on top of each other.

Abstract: A panel having multiple tubular passages extending therethrough and fitted on each end with a fluid tight hollow header. Apertures through one side of the headers place the tubular passages in communication with the interior of the headers. Fluid pumped into one header flows through the tubular passages to the other header, exchanging heat with the environment surrounding the panel as it passes therethrough. The panels are formed to provide a flow restrictive feature at the ends of the through fluid passages so that substantial flow will exist in all passages in all panels in an array of panels. One method for obtaining a fluid tight bond between the headers and the panel involves a forming process utilizing a heated die applied to the panel ends, and a subsequent panel and header material melting process followed by imposing pressure contact between the formed panel ends and the headers to thereby effect a permanent bond or weld.

Abstract: A fiber optic image transporting device for converting the shape of optical images directed thereinto. The device is formed of an initially rigid multifiber conduit having a leachable fiber connecting matrix. The matrix is removed from one end of the conduit and replaced with a fiber bonding resin. The intermediate portion of the conduit is then leached, keeping its opposite end intact as one image transmitting face of the device, and the resin bonded end is cut into sections of predetermined shapes and sizes which are reassembled to form a differently shaped second image transmitting face.