Abstract: A halogen acceptor according to general chemical formula (I) is added to a photographic negative roomlight emulsion, consisting of at least 90% of silver chloride, having an average grain size smaller than 0.3 micron, and internally doped with an element of group VIII of the periodic table. ##STR1## In this formula: R.sup.1 =alkyl having at least 4 C-atoms, preferably between 4 and 9.In the coated emulsion layer, the halogen acceptors of the invention provide a clear print-out effect and an improved development latitude when the emulsion layer is developed in a "hard-dot Rapid Access" processing system.In a preferred embodiment R=--C.sub.6 H.sub.13 and the element of group VIII is Rhodium.

Abstract: Thermal dye sublimation transfer printing method whereby dye is selectively transferred from a dye-donor element comprising a mono- or duplo-arylazoaniline dye to a transparent receiver sheet.

Abstract: A photographic silver halide emulsion, of which at least 50% by weight of the silver halide crystals are triply twinned crystals with a crystal structure consisting of a basic tetrehedron with [111]-faces and three identical twinned regions, each of which has a [111]-twin face in common with the basic tetrahedron and is outwardly bounded by three [100]-faces and one [111]-face or by four [100]-faces, and of which any two respective regions are connected to each other by a common [411]-twin face, and whose grain size distribution has a coefficient of variation of at most 20%, is suitable for the production of photographic materials having high sensitivity, high contrast and very high developability.

Abstract: An electrolytic silver recovery system for recovering silver from photographic fixing solutions, by means of an electrolytic cell (28) having an anode (52) and a cathode (53), and circulation pumps (29a, 29b) for removing solution from the cell and returning it to the cell, which device comprises a hydrocyclone (56) located in the liquid path (55) from the cell to the suction side of the pumps and connected at its outlet directly to the suction side of the pumps. The suction pressure of the circulating pump maintains a low pressure differential of less than about 0.6 bar between the inlet and outlet of the hydrocyclone which establishes the liquid flow through the hydrocyclone.

Abstract: Color photographic silver halide material which contains in at least one silver halide emulsion layer a magenta coupler of the formulae (I) or (II) ##STR1## wherein R.sub.1 denotes alkyl, aryl or a ballast radical,R.sub.2 denotes a ballast radical, alkyl, or aryl andZ denotes hydrogen or a group which can be split off on reaction with the developer oxidation product,and a compound of the formula (III) ##STR2## wherein R.sub.3 denotes alkyl, alkoxy, aryl, optionally substituted amino or the radical of a heterocyclic compound andR.sub.

Abstract: Dye-donor element for use according to thermal dye transfer methods, said element comprising a support having thereon a dye-binder layer comprising a dye corresponding to the general formula: ##STR1## wherein A represents the atoms completing a (hetero)aromatic ring system, which may be substituted or not, Y is O, S, or NR.sup.1, X stands for N-Ar, N-Het, N-N=Het, or CR.sup.2 R.sup.3, R.sup.1 is H, (un)substituted alkyl, (un)substituted cycloalkyl, (un)substituted aryl, --SO.sub.2 R.sup.4, --COR.sup.4, --CSR.sup.4, or --POR.sup.4 R.sup.5, Ar is an aromatic nucleus, which is substituted in para-position with amino, alkyloxy, aryloxy, alkylthio, arylthio, which groups may be substituted, or with hydroxy and mercapto, and which aromatic nucleus may also be substituted in other positions with alkyl, aryl, or an acylamido group, Het represents a substituted or unsubstituted heterocyclic ring, R.sup.2 and R.sup.

Abstract: Method of forming a silver image by exposing a silver halide emulsion spectrally sensitized with a trinuclear merocyanine dye to light of 600-690 nm and wet-processing the emulsion with aqueous developing or activating solution and fixing solution, thereby dissolving away said dye from the resulting silver-image-containing material, said trinuclear merocyanine dye comprising at least 2 water-solubilizing groups.

Abstract: The present invention relates to a photographic reversal process for the production of positive photographic images by imagewise exposure of the photosensitive material containing at least one silver halide emulsion layer, black-and-white first development of the material, chemical fogging or diffuse second exposure and subsequent color development, characterized in that1. at least one N,N-dialkyl-p-phenylenediamine derivative is used as sole developer in the first development,2. the first development bath contains at least one compound which prevents the developer oxidation product formed during the first development from reacting with the color couplers present in the color photographic reversal material to form image dyes,3.

Abstract: A method of growing a GaAs crystalline layer on a Si substrate by means of which mechanical stresses causing microcracks in the materials when cooled due to the difference in their thermal coefficients are reduced and the location of the microcrack is controlled to predetermined sites. Microcracks are deliberately induced in the GaAs layer at locations where the operation of the ultimate electronic device created on the material is not affected by applying to the substrate a SiO.sub.2 mask providing a deposition opening or window for the GaAs layer, which masks defines along the opening boundary at least one vertex in the cleavage direction of the GaAs crystals. The vertices in the mask create notches in the periphery of the deposited layer which determines the location of any microcracks.

Abstract: Color photographic recording material containing as cyan correction dyes, azomethine dyes corresponding to the general formula IV or V ##STR1## is distinguished from materials containing the cyan correction dyes hitherto used by its increased stability of latent image nuclei when stored under tropical conditions (35.degree. C. at 90% relative humidity).In formulae IV and V,R.sub.1 and R.sub.2 denote H, optionally substitued C.sub.1 -C.sub.4 -alkyl, C.sub.6 -C.sub.10 -aryl and C.sub.1 -C.sub.3 -alkoxy,R.sub.3 denotes H, optionally substituted C.sub.1 -C.sub.4 -alkyl, C.sub.6 -C.sub.10 -aryl and C.sub.1 -C.sub.3 -alkoxy nd halogen,R.sub.4 denotes H, optionally substituted C.sub.1 -C.sub.4 -alkyl and C.sub.1 -C.sub.3 -alkoxy, CN, halogen, SO.sub.2 R.sub.7, COOR.sub.7, SO.sub.2 OR.sub.7, COR.sub.7, SO.sub.2 NR.sub.7 R.sub.8 and CONR.sub.7 R.sub.8,R.sub.5 denotes NHCOR.sub.9, NHCOOR.sub.9, NHSO.sub.2 R.sub.9 and NHPO(R.sub.9).sub.2,R.sub.6 denotes CON(R.sub.9).sub.2, NHCOR.sub.9, NHCOOR.sub.9, NHSO.sub.2 R.sub.

Abstract: An arrangement for turning an image projected on an image screen has an image screen, a trapezoidal prism for image turning, and an optical system for image producing. The prism has an entry surface, a base surface and an exit surface. The entry surface of the prism encloses with the base surface an angle which is different from an angle enclosed by the exit surface of the base surface. A light beam extending on an optical axis of the optical system for image producing is offset on the exit surface relative to the optical axis and encloses an angle with the optical axis which is not equal to zero, and a transmission filter is located between the prism and the image screen.

Abstract: An image-reproducing apparatus of the internal drum type, in which a linear slide (33) with a reproducing head (32) with a rotatable beam reflector (27), is arranged for translation along two guides in the form of two glass rods (39,43), the sliding contact of the slide with one rod being a two-point (40,41) and with the other rod being a one-point (55) contact.

Abstract: In an improved embodiment, film cassettes comprising a substantially cylindrical casing, a film mouth of an upper lip and lower lip extending over the width of the casing, a film spool and end caps, the upper lip and lower lip of the film mouth being provided with sealing strips, contain the sealing strips for the lower lip bonded to the metal in such a way that the edge zones of the sealing strip on the narrow sides and the edge zones of the sealing strip on the longitudinal side are completely bonded to the metal on the lower lip while the edge zone of the sealing strip on the longitudinal side is completely or partly bonded to the metal inside the cassette and all or part of the inner region of the surface of the sealing strip is not bonded to the metal, so that 10 to 60% of the total surface area of the sealing strip is not bonded to the metal strip.

Abstract: Bead polymers having an average particle diameter of from 0.5 to 10 .mu.m and a narrow particle diameter distribution of K.ltoreq.0.25 and containing from 1 to 60% by weight of chemically bound fluorine are suitable for use as matting agents and spacers in photographic recording materials.

Abstract: A photosensitive silver halide material comprising a support and at least one photosensitive silver halide emulsion layer, of which the emulsion contains an effective quantity of at least one compound from each of at least two classes A, B, C and D defined hereinafter:A) compounds corresponding to general formula I ##STR1## B) compounds corresponding to general formula II ##STR2## or tautomers thereof, C) compounds corresponding to general formula (III) ##STR3## D) compounds corresponding to general formula IV ##STR4## in which R.sub.1 -R.sub.3, R.sub.11 -R.sub.19, Y, Z, m and n are as defined in the specification,are distinguished by effective latent image stabilization for a minimum increase in fogging and loss of sensitivity.

Abstract: A photographic recording material comprising a support, at least one photosensitive silver halide emulsion layer, a protective layer on that side of the at least one silver halide emulsion layer remote from the support and, optionally a backing layer, the protective layer and/or the backing layer containing in combination (a) a polymeric compound (I) containing at least 0.2 mol-% recurring units corresponding to the following formula ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 may be the same of different and represent hydrogen, alkyl or halogen,L is a chemical bond or a standard binding link andX is a reactive group,and (b) a finely divided crystalline SiO.sub.2 dispersion having an average particle diameter (number average) of from 0.7 to 1.2 .mu.m and containing less than 0.2% by volume particles larger than 4 .mu.m in size, are distinguished by good retouchability in combination with good mechanical properties.

Abstract: The X-ray sheet film cassette has a top part hinged to a base part. The bottom of the base part is provided with a frame enclosing a film supporting plate through which the radiation is transmitted. The supporting plate has a laminated structure including two face plates of thermoplastically bonded carbon fibers and a comparatively thicker intermediate plate of a synthetic hard foam rubber sandwiched between the face plates and being glued thereto. The face plates are considerably thinner than the intermediate plate in the laminated supporting plate of the present invention.

Abstract: A cutting device for layered or unlayered foil lengths, having good cut quality and an extended period of use before re-grinding of the cutter is required, consists of cylindrically shaped keyway cutter bars with distance rings lying between them, which are mounted on a blade shaft, and of roller blades of right-angles cross-section, which are equally mounted on a blade shaft and wherein each roller blade is pressed by a spring washer against the corresponding keyway cutter bar. The advantage according to the invention consists in that first each roller blade is supported on one of the cutting blades of the keyway cutter bar and that after these cutting shoulders wear off the whole roller blade shaft is turned around and in each case the other cutting shoulder is used for cutting. After these cutting shoulders too have worn off the cutting device is made usuable for further cutting operation by grinding off the cylindrical outer surface of the keyway cutter bars (FIG. 2).

Abstract: A process for cooling a heated polymer film by applying to both surfaces of the heated film, a cooling liquid adapted for wetting contact with the film surfaces. The viscosity of the layers of liquid adhering to the film surfaces is significantly reduced to facilitate removal of such liquid layers. The viscosity can be reduced by significantly raising the temperature of the adhering liquid layers after the film has been sufficiently cooled or by changing the adhering liquid to a different liquid of lower viscosity. Preferably, the liquid layers are removed for the film surfaces by conveying the liquid carrying film upwardly to cause the liquid layers to each form into a generally triangular shape with the vertex extending upwardly and blowing air stream downwardly against each such vertex.

Abstract: Dye-donor element for use according to thermal dye sublimation transfer comprising a support having thereon a dye layer containing a duplo-arylazoaniline dye incorporating two or more arylazoaniline chromophore units which are linked to each other by means of chemical bonds or linking groups.