Abstract: Photographic material and process suitable for producing by diffusion transfer a color image and comprising on a support at least two differently spectrally sensitive negative working silver halide emulsion layers (FIG. 3, layers 12, 14 and 16) and having operatively associated with each of said emulsion layers a different non-diffusing dye providing compound that is initially immobile in an alkali-permeable colloid medium and wherefrom by reduction in alkaline medium a dye or dye precursor can be split off in diffusible state, wherein at least one of said negative working silver halide emulsion layers is associated in water-permeable relationship with a visible light-sensitive direct-positive emulsion layer (FIG. 3, layers 13 and 15) whereby interimage effects can be obtained.

Abstract: An arrangement for developing film has a developing chamber which is provided with an inlet and an outlet for the developer. The chamber is located above a first container having an open upper end and arranged to receive developer discharged through the outlet of the chamber. This container is located inside of or above a second container arranged to receive developer which overflows from the first container. The containers have respective outlets which merge into a single conduit leading to the developing chamber. A heating device surrounds the conduit or is accommodated in the first container and functions to heat the developer to a predetermined temperature required for development. A pump for circulating the developer is arranged in the conduit which leads to the developing chamber. The outlet of the second container is provided with a valve which is controlled by a thermal sensor.

Abstract: In a process for the chain-lengthening of gelatine the gelatine is brought into contact with a hardening agent which can activate the carboxyl groups of the gelatine. The result is a partially hardened gelatine which has advantageous properties as for the production of photographic layers.

Abstract: Photographic material comprising a supported or self-supporting binder layer incorporating a photoradical precursor compound in operative relationship with an image-forming precursor compound which is capable of taking part in image formation by reaction with the photoradicals formed by photoexposing said photoradical precursor, wherein the image-forming compound is a reducing compound containing Zerewitinoff active hydrogen for forming a print-out image or an ethylenically unsaturated compound capable of free-radical addition polymerization, and the photoradical precursor compound is a di- or tri(2,3-aryl substituted indolyl) compound free of Zerewitinoff active hydrogen.

Abstract: Compounds corresponding to the formula: ##STR1## wherein R.sup.1 represents an aromatic group, andR.sup.2 represents H, alkyl, alkenyl, aryl or acyl, are suitable ED precursor compounds for use in color photographic recording materials. They are preferably used in combination with reducible dye releasers. They are also suitable as so-called scavengers.

Abstract: A film-treatment device has two spaced and generally parallel mounting plates each having a pair of plate holes and respective pairs of journals in the plate holes having respective journal holes centered on a pair of journal axes. The journal holes of the plates are coaxial with each other and the two journal axes are parallel. Rollers centered on respective roller axes each have a pair of substantially cylindrical end trunnions centered on the respective roller axis and rotatably received in a respective one of the journal holes for rotation of the respective roller therein with its roller axis coaxial with the respective journal axis. The journals of one of the journal axes are constructed so the respective roller can move against spring force limitedly away from the other roller.

Abstract: Hydrophobic substances, particularly hydrophobic additive for photographic layers such as couplers may be dispersed in an aqueous medium in a two--or more--stage process using an oil-former. In a main dispersion stage the total quantity of the hydrophobic substance is dispersed in the aqueous medium without oil-former or with only part of the total quantity of oil-former. The residual portion of oil-former is dispersed in the aqueous medium without hydrophobic substance in at least one further dispersion stage preceding or following the main dispersion stage. The oil-former used is preferably a compound or a mixture of compounds selected from triaryl phosphates, dialkyl phthalates, monoesters of .alpha.-substituted succinic acid or of hydrogenated phthalic acids and aliphatic or cycloaliphatic alcohols of at least 10 carbon atoms. The process yields dispersions of improved stability of digestion.

Abstract: Azo dyes of formula II are released on development from dye releasers which are associated with a light-sensitive silver halide emulsion layer. The azo dyes are chelatable and form with metal ions blue or cyan dye-metal-complex image dyes. ##STR1## In the formula A.sup.1 and A.sup.2 represent electronegative substituents whose meta-sigma values .sigma..sub.m (according to D. H. McDaniel and H. C. Brown in J. Org. Chem. 23, 420 et seq (1958) conform to at least one of the following three relationships:1. .sigma..sub.m (A.sup.1), .sigma..sub.m (A.sup.2) +0.332. .sigma..sub.m (A.sup.1) +.sigma..sub.m (A.sup.2) +0.75;3. .sigma..sub.m (A.sup.1) +0.33 and A.sup.2 represents--SO.sub.2.sup.XX represents H, --OH, --NH.sub.

Abstract: The light-sensitive color photographic silver halide recording material contains in at least one of its light-sensitive gelatine-containing layer, color formers for the formation of the image dyes in the three primary colors, a crosslinking agent activating the carboxyl groups of gelatine selected from carbamoylonium salts, carbamoylpyridinium salts and carbamoyloxypyridinium salts and a compound acting as aldehyde-scavenger which corresponds to the general formula ##STR1## wherein Z represents the atoms required for completing a 5-6-membered substituted or unsubstituted carbocyclic ring or a substituted or unsubstituted heterocyclic ring which may contain oxygen, nitrogen or sulfur as hetero-atom.

Abstract: X-ray film in a cassette or camera is magnetically gripped by a pair of magnetic units which engage opposite sides of the film. Each of the units includes a sheet of magnetic material and an intensifying screen located on that side of the associated magnetic sheet which faces the other unit. The units have cooperating first portions which engage a first region of the film and cooperating second portions which engage a second region of the film. The units are designed in such a manner that the magnetic force of the second portions exceeds that of the first portions so that the second region of the film is gripped more strongly than its first region. Furthermore, the units are arranged such that the second portions thereof engage the film no later than the first portions thereof. In this manner, entrapment of air bubbles on the surface of the film is prevented and image quality is improved.

Abstract: The pattern scanning projection device for copying machines of the type in which a pattern is projected in a strip-like manner on an image recording support by means of a pattern scanning unit which is movable in guiding grooves and includes a plurality of scanning lens plates. The lens plates for the sake of uniform projection of partial images cooperate with aperture and/or image field diaphragms and with separating diaphragms. The lens plates are individually insertable into an objective housing which is detachable from the copying machine. The housing is assembled of two parts, one housing part being provided with mounting longitudinal grooves engaging one longitudinal edge of respective lens plates and the lens plates being centered in the longitudinal grooves by separate centering grooves and being secured in central position at one point only so as to permit longitudinal displacement due to mechanical or thermal stresses.

Abstract: The invention relates to an apparatus and to a method for removing thickenings in layers which are produced transversely to the direction of travel of the web after the coating of continuously moving webs with liquids whereby the coated web is deflected by a web guide element and two air jets pointing towards each other are directed to a small angle .alpha. towards the layer of the web from below the deflecting point as air blades which are actuated when thickenings appear in the layer and which scrape off the particles of the thickening and blow them into a vacuum tank which is sprinkled all over with water and the water and particles are supplied to a vacuum generating device which, in turn, is evacuated by a jet suction device without interrupting the vacuum.

Abstract: An arrangement for developing or fixing film has a container for accommodating a developing or fixing solution. A pair of spaced strips or sheets extend across the container. The surfaces of the strips or sheets which face one another are provided with a series of aligned slots. The slots are designed to receive roller racks for transporting film through the developing of fixing solution. The spacing and arrangement of the slots are such that several racks having the same width, or several racks having different widths, may be arranged side-by-side in the container. Each rack has a main gear which drives all of the rolls of the respective rack. The main gears of adjacent racks are coupled to one another while the main gear of one of the racks is further connected to a drive located outside of the container. This drive thus actuates all of the racks in the container. The racks have alignment rods for aligning the racks relative to one another and to the container.

Abstract: An optical copying arrangement, particularly an electrostatic copying arrangement, has a carriage provided with a transparent supporting plate for an original and movable in a substantially horizontal direction, a drive for moving an image carrier onto which an image is to be copied from the original, and a scanning system arranged to scan the original supported on the supporting plate by successive strips and form a copy on the image carrier, wherein the supporting plate has a part which in initial position of the carriage is located prior to a first strip, considered in direction of carriage movement, and is bent downwardly relative to the main part of the supporting plate.

Abstract: Compounds corresponding to the following general formula ##STR1## wherein R.sup.1 represents hydrogen, an aliphatic or cycloaliphatic group, an aralkyl group, an aryl group, a heterocyclic group or one of the following groups: --CO--alkyl, --CO--aryl, --CO--heterocyclic group, --SO.sub.2 --alkyl, --SO.sub.2 --aryl, --CO--O--alkyl, --CO--NH--NH.sub.2, ##STR2## and R.sup.2 represents hydrogen, an aliphatic or cycloaliphatic group, an aralkyl group, an aryl group, alkoxy, aroxy, carboxyl, carbamoyl, alkoxycarbonyl, an alkyl or aryl group attached through a carbonyl group, cyanogen, an amino group optionally substituted by alkyl, aralkyl, aryl or acyl, or a cyclic amino groupmay be used as additives in the layers of color photographic recording materials to improve the stability of color couplers, in particular magenta couplers, against formaldehyde.

Abstract: Silver halide emulsion with an average grain size of at most 0.6 .mu.m containing Co-, Ce- or Cu-salts are suitable for the production of vesicular images.

Abstract: A photosensitive recording material which includes in a supported layer a mixture of photosensitive substances in admixture with one or more polymers that are soluble in an alkaline aqueous liquid, characterized in that such mixture of photosensitive substances essentially consists of:(A) at least one photosensitive nitrone of the formula: ##STR1## in which: R is an aromatic hydrocarbon group including a substituted aromatic hydrocarbon group,R.sup.

Abstract: An arrangement for developing photographic layer carriers has at least one container for accommodating a treating medium and having an uninterrupted wall, a pump for circulating the treating medium in the container and having a first part formed by the uninterrupted wall of the container and a second part associated with the first part, and a magnetic force-transmitting element located outside the container and magnetically acting upon a rotary body of the pump so as to rotate the same.