Abstract: An apparatus and method for treating one side of a moving web includes a pair of laterally spaced vertical end members. The web to be treated passes in a downwardly extending loop around the lower arcuate edges of the end members and is sealed thereto by tension in the web. The web and end members form a trough containing a flowable treatment material, and the web moves past the flowable material to be contacted and treated thereby. Guide means direct the web downwardly to the inlet side of the trough and upwardly from the exit side of the web-formed trough.

Abstract: An illumination system for use in an overhead projector which includes a tungsten filament light source, a back concave reflector, and a plano-convex glass condenser. The position of the light source relative to the concave reflector is controlled to give a specific longitudinal separation of the light source filament and its magnified image which results in a radiation parallax which produces improved efficiency, illumination and light uniformity at the projected image of the overhead projector.

Abstract: A device for supporting a dove prism is provided which permits the dove prism to slide axially and maintain contact with a projection lens assembly in a microfilm projection device. The prism holder is rotatable to permit rotation of the images and the dove prism floats within the prism holder to maintain contact upon focussing of a lens or to maintain contact with various lens barrel assemblies placed in the photographic system.

Abstract: Pancakes of recording tape are packaged using stiff, expanded-plastic spacers, each having a web against which pancakes can rest in a stack of alternating pancakes and spacers. Each web terminates in an annular recess from which at least one deformable protuberance projects, and the core of each pancake is pinched between facing proturberances. A protective or reinforcing rim at the outer periphery of each web is sufficiently thin not to touch the rims so that each pancake can be held tightly against the adjacent webs while the stack is under axial compression, e.g., by a plastic shrinkwrap. By thus restraining both each pancake and its core, there is no core drop, upset or core rotation, problems besetting prior packages of pancakes of magnetic recording tape.

Abstract: A fly fishing reel includes a drag mechanism having a rotor attached to the line-storage spool. The rotor is frictionally engaged by two elastomeric annular rings which are variably compressed by two shell halves which are in turn compressed by a drag-adjustment knob threaded to a shaft which supports and journals the spool.

Abstract: A support yoke for a video recording core having a narrow body portion and two wire-wound coils includes a narrow slot for supporting the body portion of the recording core between the coils and relief pockets formed on either side of the narrow slot to accommodate the wire-wound coils.

Abstract: A closed, molded box for storing a videocassette includes an open sleeve, a cover and a living hinge connecting the sleeve and the cover, the hinge, the sleeve and the covering being molded simultaneously and integrally. The videocassette box may further include raised ridges on the cover and raised detents on the sleeve which engage to maintain the cover in its closed position. The cover may also include an inwardly directed protrusion adapted to contact a videocassette within the sleeve and prevent movement of the videocassette when the cover is closed.

Abstract: A light-tight, self-contained canister for preventing a roll of core wound photosensitive media, used in a microfiche or microfilm reader-printer, from being damaged or exposed to actinic light during shipping, storing and dispensing. The canister includes an open ended opaque tubular sleeve closed at both ends by opaque end caps lockingly interconnected by a rigid tie bar extending longitudinally between the end caps along the core of the photosensitive media. At least one end of the tie bar includes a pair of resilient fingers. The fingers deform upon pressure engagement with a central receiving aperture formed in the end cap. Each end cap also includes a hub portion sized to rotatively support the roll of core wound media within the canister. Also, in an alternative embodiment, the fingers may be associated with the aperture and deformable upon engagement with the tie bar.

Abstract: A hinge assembly for an access door of a videocassette is formed of intergral interlocking projections of the housing and the door, which projections are grooved to accept a straight portion of a torsion spring and thereby provide a knuckle joint of the hinge assembly.

Abstract: A support for a stretched recording film and method of attaching the film to the support. The support includes a flat disk-shaped base, an annular upstanding rim which terminates in a reference surface, an annular radially extending bonding lip which includes a bonding surface inclined with respect to the plane of the base, and a groove separating the reference surface and the bonding surface. The method of attaching the film to the support includes deflecting the center of the base to decrease the diameter of the bonding surface, bonding the film to the bonding surface, and ceasing to deflect the base so that the diameter of the bonding surface increases to induce tension in the film. A second protective layer of film may be simultaneously stretched over and bonded to the first layer of film.

Abstract: An electrophotographic copying apparatus includes a copying cycle which always alternates development between two image areas to equalize wear along the length of its photosensitive belt and which eliminates a cleaning cycle after the final copy of a copying cycle to reduce belt revolutions. Also included is a combined charger/precleaner to reduce size and a light image mask to prevent unnecessary toning of the belt.

Abstract: An electrophotographic copying apparatus includes a copying cycle which always alternates development between two image areas to equalize wear along the length of its photosensitive belt and which eliminates a cleaning cycle after the final copy of a copying cycle to reduce belt revolutions. Also included is a combined charger/precleaner to reduce size and a light image mask to prevent unnecessary toning of the belt.

Abstract: A hanging holder is provided which supports a videocassette with respect to a support channel and a vertical surface mounting the support channel. The holder is a closed sleeve into which the videocassette is inserted and includes a hook which engages the support channel. The holder may also be provided with a flexible lower surface to facilitate removal of the videocassette, a spring-biased detent for retaining the videocassette within the holder, an inwardly-extending projection which mates with a recess in the videocassette to control the insertion orientation of the videocassette into the holder and a locking rib extending adjacent the hook to contact the support wall or the support bracket and maintain the hanging holder at a predetermined angle with respect to the vertical surface upon which the support channel is mounted.

Abstract: One-piece plastic roller guide having a tubular body and two sets of three leaf springs projecting symmetrically from the root of the tubular body in opposite axial directions. At the free end of each set of leaf springs, the inner diameter of the roller guide is slightly less than the diameter of the fixed cylindrical pin on which it is mounted. This slight interference between the springs and the pin assures continuous contact between the roller guide and pin without unduly inhibiting rotation.

Abstract: A polishing tip for use on a mandrel driven by a dental engine includes a cylindrical hollow interior which frictionally engages the mandrel. The cylindrical configuration of the tip interior and the mandrel allows relative slippage if a predetermined torque is exceeded.

Abstract: A microfilm reader and printer alternatively projects a magnified image of microfilmed information onto a rear-projection screen for viewing or a photoreceptor belt for printing. The projection screen and the photoreceptor belt are in parallel planes for convenient delivery of the printed image and a movable mirror system ensures that the printed image will be of the same magnification as the viewed image.

Abstract: A low-pass filter is incorporated into the binaural tube of a stethoscope to selectively attenuate high frequency noise. The filter includes a small diameter inertance tube communicating with a large volume compliance chamber and is preferably located as far as possible from the chestpiece of the stethoscope to filter noise not only transmitted from the chestpiece, but also transmitted directly to the binaural tube.