Abstract: A method and a device for presentation of information on a plurality of sheetshaped information carriers (5) which are connected to each other in a continuous series of the sheets which are folded relative each other so that the series of sheets extends zig-zag like and forms in a storage position a pack of sheets in which the sheets are connected to each other and from which the sheets can be folded out for presentation of information on the sheets. One of the outer sheets (5) of the pack is placed with an interspace relative to the pack, which is substantially a multiple, larger than 1, of the width of each sheet between said folding lines. In this way at least two sheets at a time can be held unfolded on a base in said interspace for the purpose of presentation. The series of sheets can consecutively be brought over to the outer sheet, forming a new pack during a consecutive positioning of the sheets in the interspace for the presentation.

Abstract: An overhead projector transparency transport system uses a transparent platen 20 extending over projection window 11 and beyond both sides of projector 10. A transparent belt 80 made of a base web 84 and a pocket web 85, fused together to form a series of pockets, receives a sequence of transparencies 100, and transverse fold lines formed between pockets 81 allow belt 80 to fan fold. Pocket web 85 is fused to base web 84 at inturned edges 95 of an open side 96 of each pocket 81 to trap a transparency 100 within its pocket, once inserted. Platen 20 is positioned so that transparent belt 80 can advance across platen 20 from a fan-fold supply stack 82 next to projector 10 and proceed to an automatically formed take-up stack 83 next to the other side of projector 10.

Abstract: The invention relates to a device for facilitating the handling of transparencies to be projected by an overhead projector. The device includes a support frame which can be secured by adhesive means to the light table of a projector. A transparency is placed on the support frame, and extends across an aperture in the frame through which light is projected upwardly. An aperture cover which encloses the support frame is mounted thereon for reciprocating movement between a position covering the aperture to a position exposing the aperture. Accordingly, the aperture cover enables the projected light to be interrupted when a transparency is being changed on the support frame.

Abstract: A integral plastic frame for holding a film slide includes a central window, a recessed bearing surface, which surrounds the window and serves to contact the film slide when it has been inserted to cover the window. The transparency as it is inserted and in its final position is guided between the bearing surface and the retaining elements facing the bearing surface. The retaining elements substantially consist of continuous retaining strips, which extend in the direction in which the film slide is inserted. The retaining strips are attached to mutually opposite sides of a central window of the integral frame member by means of narrow connecting webs, which extend at right angles to the direction in which the film slide is inserted. The plastic material of the frame member is so elastically flexible that an opening through which the film slide can be inserted is formed between the retaining strip and the bearing surface.

Abstract: A protecting device (1) for transparencies (8) intended for overhead projection and pivotably mounted about a swivel pin (9) in the protecting device (1) is provided in the form of an unfoldable file. This file comprises a bottom cover (2) shaped as a rectangular frame with a transparent window (5) and comprising side members (6,7) secured thereto and situated at opposing rim portions. The swivel pin (9) is mounted in one side of the frame, preferably adjacent one corner of the frame, and in such a manner that it extends substantially perpendicular from said frame. The transparencies (8) are provided with a gripping register (10a, b, c) and are collated in a swivel cover (11) so as to be turned out individually, said swivel cover being pivotably mounted about the swivel pin.

Abstract: A microfiche punch unit and method are disclosed. The method and apparatus assure proper alignment between the images and the binary identification tabs attached to the edge of the microfiche. In the pre-tabbing stage the microfiche is punched to create reference holes which are measured from the image grids rather than the edge of the fiche. The microfiche is "registered" (checked for alignment) by aligning the images with reference lines on the punch unit prior to punching the reference holes. During the actual tabbing, the fiche is placed over pegs added to a prior art tabbing press, to secure the fiche. The method and apparatus are ideally used in a microfiche storage/retrieval unit, such as those which are part of a digital imaging process.

Abstract: The subject matter of the invention is constituted by a projection apparatus for the projection of transparencies on to a screen. The transparencies are articulated together. One at a time the rows of transparencies are located between a light source and a lens, same being moved along the row of transparencies in order to project the transparencies in order on the screen. When the transparencies of one row have been projected, the chain is moved through one step in order to place the next row of transparencies in place of the former one in between the light source and the lens. The invention furthermore relates to a particularly convenient design by which a number of transparency rows may be chained together with articulating joints therebetween.

Abstract: The slide projector (4) for single-slide, lap-dissolve or stereo projection, which works on the gravity feed principle, is designed for operation with linear slide trays (1, 2) divided into compartments. At the top, it has either two receptacles for slide-tray covers (2, 5) or one receptacle (4g) and one cover (4h) integral with the housing of the projector. When being placed on the projector, the slide tray is automatically unlocked, so that the housing of the tray becomes shiftable. Switching means ensure that the projector cannot operate until the slide tray is properly positioned. The projector also has a variable electronic light intensity control facility. It initiates no projection when a tray compartment is empty.The slide tray (1, 2) is so designed that slides are loaded into the housing (1) of the tray from above in an upright and laterally correct image position; the housing (1) is then closed with the cover (2). During projection, the cover forms the bottom of the slide tray.

Abstract: A photographic slide assembly comprises a transparency and an activator sheet which are relatively movable. The transparency has an illusion-of-motion dot pattern thereon in an image defining area or areas and the activator sheet has an illusion-of-motion dot pattern thereon which is operationally complementary to the motion pattern of the slide transparency. The activator sheet is supported adjacent to the slide transparency so that the motion pattern of the activator sheet and the slide transparency fall within the field of focus of a slide projector lens when the slide assembly is operationally mounted within the projector.

Abstract: A protecting device (1) for transparencies (8) intended for overhead projection and pivotably mounted about a swivel pin (9) in the protecting device (1) is provided in the form of an unfoldable file. This film comprises a bottom cover (2) shaped as a rectangular frame with a transparent window (5) and comprising side members (6,7) secured thereto situated at opposing rim portions. The swivel pin (9) is mounted in one side of the frame, preferably adjacent one corner of the frame, and in such a manner that it extends substantially perpendicular from said frame. The transparencies (8) are provided with a gripping register (10a, b,c) and are collected in a swivel cover (11) so as to be turned out individually, said swivel cover being pivotably mounted about the swivel pin.

Abstract: The specification discloses a slide mount which may be used in a conventional slide projector enabling the film transparency to be rotated during image projection. More particularly, the mount comprises a body to be stationarily supported in the projector and a film-supporting assembly rotatably supported by the body. The film-supporting assembly is engageable at one edge of the body by a rotatable driving mechanism. Preferably, the film-supporting assembly is registered against the body in a direction perpendicular to the film to provide critical focus for the film.

Abstract: A transparency that is used in a flying spot scanner to generate imagery for simulated flight contains a rectangular center section and eight peripheral sections, four of which lie along the side boundaries of the center section, while the remaining four are at the corners of the center section such that their edges are contiguous to the edges of the side peripheral sections. Each of the nine sections is laid out such that corresponding terrain features lie along opposite margins. This coupled with the fact that all nine sections are identical enables all of the sections to blend together into a mosaic so that the section boundaries within the interior of the mosaic are barely, if at all, discernible. As a consequence, the terrain pattern along any boundary of the center section is repeated along the opposite boundary. A projected raster moves essentially within the center section in response to commands issued from a simulated cockpit.

Abstract: A microfilm card adapted to be used with a microfilm reading device. The card has an image area having a plurality of images arranged in rows and columns, at least one of the images containing an expanded index of the location of the images. An index area adjacent to the image area contains a plurality of indexes thereon, with the index area precisely and accurately positioned with respect to the image area. The indexes relate to their respective expanded index on the image area, the index viewable directly by the operator. There are means on the microfilm reader which interface with the microfilm card to position the card in the reader in the same precise location each time it is to be viewed.

Abstract: An extension platform for holding a book of transparencies in an operative position on an overhead projector includes a body member adapted to receive and hold a pack of transparencies, at least two suction cups positioned on the underside of the body member for attaching and securing the body member to the stage area of an overhead projector and wedge-shaped fulcrum means located under the body member which translates the downward gravitational force of the weight of the pack of transparencies into an upward pull on the suction cups. In another embodiment, the extension platform is attached to part of a book of transparencies.

Abstract: Articles having on one surface thereof a linear prism array and a diffraction grating on the opposite surface are provided which are suitable for the preparation of projection transparencies.

Abstract: An audio-visual cartridge containing two coplanar adjacent rotatable discs, a visual disc carrying a plurality of picture transparencies mounted in a ring for successive viewing and an audio disc having sound recording tracks on a face thereof for individual sound recordings corresponding to transparencies, the cartridge being in the form of a flat envelope having a first and second internal compartment disposed in coplanar relation for accommodating the discs. An apparatus for reproducing recordings while a user views transparencies on discs contained in an audio-visual cartridge is provided with a manual selector for rotating the visual disc and a motor drive for rotating the audio disc, an optical viewer for reading the transparencies, an audio device for reading sound tracks and reproducing recordings and a circuit and mechanism for coordinating the rotation of the discs so that individual recordings corresponding to transparencies are reproduced while the corresponding transparencies are being viewed.

Abstract: A microfiche and a microfilm reader comprising automatic positioning of the film stage, characterized by the following features:(a) the microfiche (MFK) is provided with an index (2) of the information present in its individual images and of their x,y coordinates in optically coded form and with a timing track (4),(b) the reader comprises a read head (19) with electronic-optical sensors to read the optically coded index on the microfiche (MFK),(c) an electronic read/write memory (20) for storing the index (2) is connected to the read head (19),(d) provision is made for an alphanumeric keyboard (27) to feed-in a search concept (search key) and followed by an encoder (26) and a register (25) for storing the coded keyboard input,(e) a comparator (24) is connected to the memory (20) of the index (2) and the register (25) of the coded keyboard input, which determines the agreement between the search key and a concept present in the index,(f) the comparator (24) and the memory of the index are followed by appropria

Abstract: Diapositives are mounted in a strip formed by a pair of flexible sheet members each having at least two picture openings therein in side-by-side relationship and the sheet members are fastened to each other in face-to-face relationship mutually offset by a single picture opening. The frame is interposed between the sheet members and a diapositive is moveably positioned within an opening in the frame. The thickness of the frame is greater than that of the diapositive so that a diapositive is freely moveable within a frame opening and has play between the sheet members. An apparatus for projecting the strip mounted diapositives is provided with a pair of cassettes one of which contains a strip in which the diapositives are mounted and the second cassette contains a strip without any diapositives. The ends of the strips are automatically connected to each other for successively introducing the diapositives into the apparatus.

Abstract: Diapositives are mounted in a strip formed by a pair of flexible sheet members each having at least two picture openings therein in side-by-side relationship and the sheet members are fastened to each other in face-to-face relationship mutually offset by a single picture opening. The frame is interposed between the sheet members and a diapositive is moveably positioned within an opening in the frame. The thickness of the frame is greater than that of the diapositive so that a diapositive is freely moveable within a frame opening and has play between the sheet members. An apparatus for projecting the strip mounted diapositives is provided with a pair of cassettes one of which contains a strip in which the diapositives are mounted and the second cassette contains a strip without any diapositives. The ends of the strips are automatically connected to each other for successively introducing the diapositives into the apparatus.

Abstract: A card negative holder (10) and method of manufacture thereof is disclosed. Card holder (10) is comprised of a flat member (12) with pressure-sensitive stock (14) adhesively fastened to one side of flat member (12). The stock (14) is slit to allow insertion of negative (16). With plasticized covering paper (32) removed from stock (14), adhesive-backed sheet (30) may be pressed against flat member (12) to hold negative (16) between flat member (12) and stock (14).Card holder (10) is manufactured by a flexographic process wherein both sides of flat member (12) are printed. Pressure-sensitive stock (14) is laminated to the material (58) of which flat members (12) are made. Detail features are cut in the composite lamination (54) before a final transverse cut is made to create finished product mounting cards (10).

Abstract: An envelope for transparencies for overhead projectors comprises a substantially rectangular pocket of transparent plastic sheet material. The pocket is open along at least one side edge for insertion of the transparency to be presented therebetween. At least one opaque flap is attached in a foldable manner along one of the longitudinal side edges of the pocket, said flap being attached to and spaced a distance from the longitudinal edge such that holes may be punched in the sheet material along said side edge between the flap and said edge and that in the unfolded position the flap covers the longitudinal side edge and in the folded position it exposes said longitudinal side edge and any holes to permit storage in a binder, file or the like.

Abstract: The invention relates to a parallelepipedic tray intended to accommodate slides (7) which are to be viewed. The tray mainly comprises an upper wall (1) and a lower wall (2) each of which has grooves (6). The slides can be inserted in or removed from the tray via either of two open side surfaces, and to prevent the slides from dropping out when the tray is being handled, the tray has two flaps (8 and 9). Such a tray can be used on a slides viewer which has two carriages (22 and 23) to support and guide the trays, which carriages are disposed symmetrically on either side of optical system (28).

Abstract: A large image or picture system includes a flat screen, on which is projected pictures from three small liquid crystal display panels behind or in front of which are disposed respectively three filters of the colors red, green and blue. Three light sources are provided behind the respective liquid crystal panels, while three lenses are provided respectively in front of the liquid crystal panels. The lenses project three partial pictures in three different colors onto a single screen, creating a complete multicolored picture. For high capability of information of the pictures, large liquid crystal panels are proposed, which are assembled from many small liquid crystal cells, allowing rapid switching and multiplexing. Changing the frequency of the voltage applied to the liquid crystal cells results in a modulation of the light intensity of the individual parts of the picture, resulting in artistic pictures, like photographs.

Abstract: A projection device comprising a film projector and a loop box for a continuous film in which the projector includes a sprocket for feeding the continuous loop of film through a film gate which may be of the customary type. The loop box comprises a frame having transversely and longitudinally spaced upper and lower shaft supports, a plurality of shafts journaled in each of said upper and lower shaft supports, a plurality of pulleys rotatably mounted on each of the shafts by means of ball bearings and means to drive each shaft in the direction which the rollers mounted thereon move when the film loop is advanced through the film gate by the drive sprocket.

Abstract: A film unit comprises a hub and a film disk carried by the hub having photosensitive areas for receiving a plurality of images. The hub includes a region of dispersed magnetic particulates for recording data pertaining to the film unit. Since the hub supports the film disk, the data will remain oriented relative to the disk, and to specific images on the disk, during processing steps incident to the finishing of the film unit, e.g. during developing and printing.

Abstract: A device for displaying sheet opaque pictures in which images of scenes thereon are transmitted from a housing onto an exterior display. A picture exchange magazine has a display window at the picture scene such that the top of a stack of pictures is confined at the window and the remainder are confined behind it. The magazine includes first and second frame members, the latter being relatively reciprocable parallel to the window and picture scence for cyclic exchange of the top picture in the magazine. A release holder retains the magazine on the housing while allowing the frame members to remain relatively movable to each other.

Abstract: A large system includes a flat cinema screen on which is projected pictures from a small transparent liquid crystal display (LCD) pattern panel. A light source is provided behind the pattern panel and a cinema lens is provided in front of the pattern panel. An electronically controlled color filter in one embodiment is placed behind the pattern panel allowing one to obtain colored figures. In one variant, an electronically controlled gray filter, placed behind the pattern panel allows one to obtain artistic or black-and-white photograph-like pictures. The pattern panel together with the electronically controlled color filter and/or the electronically controlled gray filter forms an electronically controlled slide, a new electronic component.

Abstract: A cartridge is disclosed for an audiovisual filmstrip projector. The cartridge holds a filmstrip and a standard magnetic tape cassette. Spring hooks are provided on a mounting plate of the cartridge for releasably attaching the cassette by a single motion of pressing the cassette toward the mounting plate and for allowing removal of the cassette from the cartridge by a single motion of pulling the cassette away from the mounting plate.

Abstract: A cord is wound on and off of a pair of drums in a microfilm reader. The cord comprises a strip of microfilm of approximately 1 mm width, encapsulated in a transparent material to protect the film from scraping, scratching and the like as the same moves through a microfilm reading apparatus. The film may be processed in a variety of techniques to record information thereon, and after the recording process the film is encapsulated between a pair of translucent members into a cord which is then wound upon one of the drums and attached at one end to the other drum. The two drums carrying the cord are mounted in a capsule which is a replaceable component of a microfilm reader. Each of the drums is provided with a driven gear and the reader is provided with a pair of driving gears for engagement with respective ones of the driven gears.

Abstract: An horizon projection device for an aircraft simulator.The device comprises an aerial image 4 of a part of the Earth's surface, an optical image projector comprising a variable magnification system 13, an optical scanning device 18 and a wide angle projection lens 17. The optical system 13 forms in the focal plane of the wide angle lens 17 an intermediate image whose dimensions depend on the magnification. Controls responsive to the altitude, to the attitude and to the heading simulated by the pilot act on the magnification of the optical system 13, particularly to correct an apparent altitude variation due to the shift between the eyes of the pilot and the wide angle lens, during simulation of the aircraft going over on to its back.

Abstract: There is disclosed a system for storing a projection mask of the type used for printing integrated circuit patterns on silicon wafers. A special cassette package permits the mask to be stored in a clean sealed environment. A delivery system transports the sealed cassette into an optical projection instrument wherein the cassette is opened and the mask advanced to the projection stage. After projection, the mask is returned and automatically sealed into the cassette. The cassette may be evacuated or, alternatively, filled with a clean gas. The mask sealed in the cassette can then be stored until its use is again required.

Abstract: A cassette, cartridge, box or magazine for storing and projecting transparencies or slides as well as a viewer or projector, the cassette and the viewer or projector matching each other. Said cassette having two compartments for stacks of slides and a structure connecting said compartments and being provided with a passage for moving the slides one by one from the bottom of one compartment to the other compartment and preferably from the top of the last named compartment to the first named compartment through a second passage. The connecting structure being adapted for attachment to a projector or viewer with a slide in said passage being arranged between a light source and a focussing lens. The viewer or projector being provided with means for pushing the slides one by one from one compartment through the passage into the other compartment.

Abstract: A film card for use in an automatic microfilm display apparatus has a plurality of image frames, each bearing a marker image. One of the frames is a reference frame and includes only the marker image. The reference frame can be used for accurate positioning of a raster pattern on the remaining frames.

Abstract: A recording tape carrier is attachable to a card or photograph and carries a magnetic recording tape that is usable in the recording slot of a magnetic recorder. A support card has a linear reference edge, and an abutment card is secured to a face surface of the support card to have an abutment edge extending along a mid-region of the support card and parallel with the reference edge. Adhesive covered by a release sheet is coated on the face surface of the support card in a region not occupied by the abutment card, and a strip of magnetic recording tape is secured to the support card or the abutment card to extend parallel with the reference edge. The release sheet is removable for securing the assembly to a card or photograph by means of the adhesive with the abutment edge engaging an edge of the card or photograph, and the magnetic tape is prerecordable and can be played back or recorded while secured to a card or photograph.

Abstract: A microfiche construction embodying Cassegrainian reflecting surfaces. A fixed projection sheet is provided with convex lenses on its top surface, the lower peripheries of which are internally mirrored. An indexable lensfiche is provided with sunken convex reflecting mirrors on its top surface which are optically aligned with corresponding upper lens of the projection sheet to define Cassegrainian surfaces. Light modulated by microimages on the lensfiche strikes the Cassegrainian surfaces and passes to a viewing screen. In an embodiment, the projection sheet carries both Cassegrainian reflectors.

Abstract: An apparatus designed for the purpose of viewing transparencies on an overhead projector is disclosed. The apparatus incorporates a frame and the transparencies are retained by a portion of the frame defining a mounting member. Substantially all of the weight of the frame is concentrated in the mounting member and a member in opposed, spaced relationship to the mounting member. Tabs extending from the mounting member into the area circumscribed by the frame, in which area the transparencies are positioned for storage and display, serve to retain the transparencies in relative alignment.

Abstract: Apparatus and a method for handling and reading any one of a number of film strips, each having a number of segments with each segment containing a plurality of information-containing, high-reduction image frames. The film strips are housed in a cassette which is movable with respect to a fixed reference to align a desired film strip with a reading station disposed across the optical path of an optical system. A film strip is moved out of the cassette by a force applied to one of its side edges. Control information carried by each film strip is sensed as the film strip moves out of the cassette and the sensed information is used to control the distance through which the film strip moves so that a particular segment thereof will stop at the reading station. The optical system is moved relative to the reading system so that the optical path of the optical system is selectively alignable with a particular image frame of the film strip removed from the cassette.

Abstract: A roll film reader/printer transports film to a selected photographic area of imagery. Transparent areas are also left at any one or more selected locations on the roll film. When it is necessary or desirable to read an image on a separate and discrete piece of film, the roll of film is transported through the reader/printer in order to display a transparent area. There, a carrier for the separate and discrete piece of film is manually inserted into the reader/printer and over the transparent area on the roll film. An optically detectable symbol may be provided on the carrier so that a signal may be given when the carrier is in a reading position. Either suitable interlock switches or signals responsive to the optically detected symbol may disable the roll film transport mechanism while the carrier for the manually inserted film is in the reader/printer.

Abstract: An indexing construction for microfiche elements of the type wherein the microfiche is provided with integral lens elements to define a lensfiche. The improvement comprises altering surface(s) of the microfiche to thereby define a plurality of indexing nodules. These nodules cooperate with complementary nodules on either a viewing screen or a hardness member. By virtue of this construction both alignments of the lensfiche and indexing thereof relative to a viewing screen are facilitated.

Abstract: Microfilm is inserted between two or more parallel, transparent, laterally invertible support plates placed in a light path emanating from a light source and travelling to a projection objective. The plates are placed in a tray which can be slided in two directions normal to the light path. The microfilm located more closely to the reader is in proper position for one or more projection objectives. For reading the microfilm located on the other side, the plates are inverted in order to bring this film in proper reading position.

Abstract: A slide body of a rigid transparent material is sized to be received within a slide transparency projector. The slide body includes a bubble level indicator having a narrow arcuate chamber which is filled with a liquid to create a bubble of air trapped within a band of fluid. The bubble is displaceable within the arcuate chamber and remains at the highest point therein. When the slide is level, the bubble rests at the mid-point of the band. The slide body is also provided with a pattern of concentric rectangles and a pattern of markings to indicate the extent of deviation of the bubble from its position at the mid-point of the band. The arcuate band, bubble and pattern of markings are projected onto the screen by a projector to permit a projectionist to readily ascertain whether or not the projector is in focus and is level. The projector can then be focused and leveled by adjusting the focusing and leveling system of the projector.

Abstract: A system for previewing and projecting slides that are stored in spaced, co-planar relation in a planar holder is disclosed. The slides are previewed, either individually or in a group, in their natural orientation without removing the slides from the holder. Projection of the slides to form a naturally oriented image also is accomplished without removing the slides from the holder. In the preferred embodiment, means are provided for moving the planar slide holder orthogonally with respect to the optical axis of the projection system. A slide indexing system is provided to allow the projectionist to select a particular slide for projection. The slide indexing system utilizes cooperative means on the slide holder and projector to achieve indexing and, if desired, other control functions. In an alternative embodiment, the projected image plane is vertical and can be rotated about a vertical axis at the projector without moving the base of the projector.

Abstract: A photograhic cropping mask of a planar sheet, such as paper, plastic or cardboard, having defined therein a plurality of prescored, detachable rectilinear openings having a common center, indexing means and, optionally, an area of adhesive material and/or crop marks such that the sheet may be placed adjacent a transparent film to determine the cropping opening appropriate to the film image, the selected opening produced by detaching along an appropriate score line, the film attached by means of tape or the optional adhesive area to the sheet with the film properly aligned with the opening, and the film and sheet then accurately positioned in a photographic printing apparatus by the indexing means.

Abstract: In order to decrease light beam projectors and avoid time consuming and tedious transferring and exchanging operations in the tire manufacturing process, a light beam projecting apparatus of the present invention for use in production of an endless rubberized cord fabric, comprises a light beam projector disposed in spaced and opposed relation with a tire building drum to wrap a band-formed rubberized cord fabric; an indicator assembly located in the vicinity of the light beam projector and interposed between the light projector and the tire building drum, the indicator assembly including an indicator film having a multiplicity of indicating lines spaced from each other in a direction parallel to the rotational axis of the tire building drum to be projected upon the peripheral surface of the tire building drum; and a focus lens assembly arranged between the tire building drum and the indicator assembly and including at least a focus lens in alignment with the light beam projected through the indicator film by

Abstract: A method of producing stereoscopic film from standard 35 mm film is described in which the standard 35 mm is longitudinally cut in half. Selected sprocket holes in each half are enlarged to provide a series of locating holes at regular intervals along the film. Each locating hole enables a corresponding pair of stereoscopic film frames on the film to be located in a viewing position. Also described is a viewer for viewing the stereoscopic films. The viewer incorporates a locating finger which engages each locating hole in turn to locate and hold the film steady while viewing. The viewer includes a reciprocating drive means for driving the film. The locating finger is withdrawn from a locating hole when the drive means performs its forward stroke and the forward stroke is limited when the finger engages the next hole. The finger remains engaged with the next locating hole during the return stroke of the drive means thereby preventing any inadvertant movement of the film during the return stroke.

Abstract: A microfiche structure consisting of a laminate of an opaque, apertured web sandwiched between two transparent sheets. The transparent material partially extends into each aperture to thereby define, for each aperture, an optical doublet. The laminate may be continuously formed by compression, as by rolls.

Abstract: A visual presentation sheet is provided with a photographic image stratum and a liquid crystal stratum. Under certain energy conditions, the liquid crystal stratum scatters incident light so that the photographic image stratum is visible by direct observation. Under other energy conditions, the liquid crystal stratum is cleared to enable optical projection of the photographic image stratum.

Abstract: A microfiche having pinholes instead of lenses. The pinholes and thickness of the fiche are of such dimensions that the device functions as in the manner of a pinhole camera.

Abstract: A plastic microfiche carrier has a central clearance for enabling an insertion of a replaceable microfiche film in the carrier. The corners of the carrier are tapered to facilitate an alignment of the carrier, and therefore the microfiche in a library file housed within the cartridge. The front or leading edge of the carrier is concave in the width dimension with a bullet-like nose double taper in the thickness dimension to guide and direct the microfiche, as it slips into and out of the library file.

Abstract: There is disclosed sound slide assemblages which comprise a generally rectangular body incorporating an image bearing portion and a magnetic sound track portion. The image bearing portion is adapted to receive either a mounted or unmounted transparency. The sound track portion is contiguous to the image bearing portion and is capable of receiving sound tracks having various configurations such as spiral, arcuate, parallel and sinuous. The assemblages are characterized by their thinness and simplicity of structure.