Abstract: Apparatus for stepwise transport of exposed and developed photographic films through a copying machine so as to place selected film frames, namely those film frames which are to be imaged onto photographic paper and are designated by holes or other types of indices, into register with the copying station has two photoelectronic detectors the first of which transmits signals to the forward input and the second of which transmits signals to the reverse input of a forward and reverse counter in a circuit which regulates the speed of the film transporting motor. The second detector is located downstream of the first detector and both detectors transmit signals on detection of indices denoting the film frames to be copied.

Abstract: An apparatus for automatically determining the surface tension by the stalagmometer principle using a pipette containing a test volume, having a drop face at its lower end and is provided with three light barriers. The three light barriers are connected to an evaluation circuit which counts the number of whole drops and also determines the fractions of whole drops pertaining to the test volume.

Abstract: Electron donor compounds of the formula I are effective to reduce non-diffusing reducible color providing compounds which when reduced release under the photographic development conditions a diffusible dye.R.sup.1 (--L.sup.1 .dbd.L.sup.2).sub.n --NH--SO.sub.2 --X (I)in whichL.sup.1, L.sup.2 represent methine groups which may be part of a carbocyclic or heterocyclic ringR.sup.1 represents --OR.sup.2, --SR.sup.2 or --NHR.sup.3R.sup.2 represents H or a hydrolysable groupR.sup.3 represents H, alkyl, aryl, acyl including a group that together with L.sup.1 completes a ringn=1 or 2X represents a non-colored organic group.

Abstract: Apparatus for removing backing strips and exposed films from drop-in cassettes wherein the window for the foremost unexposed film frame is located in front of an opening for observation of symbols on the backing strip has a pusher which is movable through the opening to expel the leader of the backing strip through the window and into the nip of two first advancing rollers which introduce the leader into a first channel for entry into a collecting receptacle. The leader of exposed film is stripped off the backing strip by a deflector and enters a second channel to advance into the nip of two second advancing rollers and to be transported to a splicing station for connection to the trailing end of the preceding film. The pusher can enter a circumferential groove of one first advancing roll and the other first advancing roll has a shallower groove for a finger which directs the leader of the backing strip into the first channel.

Abstract: Compounds of the formula ##STR1## wherein the substituents have the meaning indicated in the specification are suitable as latent image stabilizer in silver halide materials.

Abstract: A photographic still provided with a magnetizable coating is inserted into a recording/playback device provided with a movably mounted head unit having a set of heads. A rotary motor drives an endless belt in a single direction, the upper and lower runs of the belt always travelling in opposite directions. The head unit is alternately coupled to the upper and to the lower run of the belt, for travel in one and then the opposite direction. Upon each reversal of the travel direction of the head unit, a successive one of the magnetic heads is activated, so as to track a meandering track on the magnetic coating.

Abstract: Process for the production of a reverse reading positive line and/or halftone image suited for use in the production of a lithographic offset printing plate, said process comprising the steps of:(1) photo-exposing a photographic negative working silver halide emulsion material comprising a negative working silver halide emulsion layer on a transparent film support and an anti-halation layer either between the emulsion layer and the film support or at the side of said support opposite the emulsion layer, the exposure of the emulsion layer occurring through the support and the anti-halation layer in a camera without a reversing optical system,(2) bringing the emulsion layer side of the photographic material into contact with an image-receiving material to form by diffusion transfer processing a visible silver image upon the latter, and(3) separating the photographic material from the image-receiving material.

Abstract: A digital circuit is described for controlling functions of a camera wherein the circuit is powered by a potential source which is connected to the circuit through a relay actuated switch. The circuit employs a plurality of D-flip flops to regulate functions such as film transport and opening and closing of the camera shutter as a function of the light intensity of the scene being photographed. A reset signal generator is used to provide stable and reliable control over the starting condition of the flip flops and render the circuit insensitive to voltage transients as may occur from contact bounce effects at the relay actuated switch. The reset signal generator employs an inverter delay chain to provide like reset pulses when such contact bounce occurs. Various control features are described.

Abstract: 2-Mercaptoalkylsulphides and 2-mercaptoalkylethers are obtained by the hydrazinolysis of 3-thiaalkylisothiuronium salts and 3-oxaalkylisothiuronium salts.

Abstract: A dye-diffusion transfer process for producing (a) dye image(s) with improved dye density is provided, said process comprising the steps of:(1) image-wise photo-exposing a photographic color material, which contains at least one alkali-permeable silver halide hydrophilic colloid layer which contains in operative contact therewith or therein a non-diffusing dye or dye precursor compound that when contacted with an aqueous alkaline liquid remains immobile in an alkali-permeable colloid layer and is capable of being reduced by a silver halide developing agent at a rate slower than that of imagewise developable silver halide and in reduced state under alkaline conditions is capable of releasing a diffusible dye or dye precursor moiety, and(2) applying in the presence of a developing agent an aqueous alkaline liquid to said photoexposed material, characterized in that said liquid contains triisopropanolamine.

Abstract: An improved abrasion and scratch resistance and resistance to chemicals of photographic materials is achieved by applying a coating composition comprising an irradiation-hardening binder, a multifunctional acrylic monomer, optionally a diiso- or polyisocyanate and a photoinitiator to the photographic material and subsequently irradiating the coating composition with light from the ultra-violet region of the spectrum.

Abstract: Apparatus for positioning sheet-like or strip-shaped originals in a photographic copying machine has a horizontal table with a large window for transmission of copying light and a removable or exchangeable holder on the table. The holder has a lower section which rests on the table and has a first opening in register with the window, an upper section one marginal portion of which is pivoted to the corresponding marginal portion of the lower section, which is movable to and from an operative position of overlap with the lower section and which has a second opening in register with the first opening when the upper section assumes its operative position, and an elastic hold-down device which is affixed to the upper side of the lower section and has an open-sided cutout in register with the first opening.

Abstract: As mordant for mordanting diffusing anionic dyes in image receiving layers of photographic dye diffusion materials the invention makes use of addition polymers having at least 10 mole % of recurring structural units of formula I ##STR1## in which Q represents nitrogen or phosphorus;R.sup.1, R.sup.2, R.sup.3 each represents a carbocyclic or alkyl group or two of these substituents complete a 5- or 6-membered heterocyclic ringR.sup.4 represents hydrogen or alkyl,X.crclbar. is an anion.

Abstract: Apparatus for drying sheets of photographic material has a group of parallel lower horizontal shafts and a group of parallel upper horizontal shafts which are staggered with reference to the lower shafts. All of the shafts extend transversely of the direction of travel of sheets therebetween and carry elastic rollers which engage and advance the sheets. Certain shafts carry holders for U-shaped guide members which flank the path of the sheets between the rollers on the upper and lower shafts and prevent the leaders of the sheets from curling into the spaces between the upper or lower shafts. The distance between the axes of two neighboring lower or upper shafts is at least 2D and the distance between the upper and lower guide members is less than D, wherein D is the outer diameter of a roller.

Abstract: A motion-picture film cassette has a pay-out spool and a take-up spool mounted coaxially, but at opposite sides of a divider wall. Film travels in one direction through the wall from the pay-out spool to the take-up spool. An anti-reversing device is provided to prevent reverse movement of the film and/or spools; it includes an annulus of holes in the wall, surrounding the axis of the spools, and a resiliently yieldable finger projecting from that surface of the take-up spool which faces the wall. The finger ratchets over the holes when the take-up spool turns in take-up direction but engages in a respective one of the holes to block reverse movement when the take-up spool attempts to turn in the opposite direction.