Abstract: A method of preparing a hologram which is of the silver halide in gelatin binder type which method comprises holographically exposing the holographic material by use of coherent light, developing the holographic image by a chemical process and wherein after development the material is treated with an aqueous solution of an anionic surfactant which comprises at least one alkyl group having at least four carbon atoms, to achieve bathochromic shift in the replay wavelength.

Abstract: A hologram which comprises a light transparent base having coated thereon a hydrophilic water-swellable layer which contains the holographic image and a dye whose peak absorption is below the peak replay wavelength of the hologram. The hologram is produced by adding the dye after exposure of the hologram.

Abstract: Method of processing photographic silver halide material wherein an imagewise release of the development inhibitor 1-aryltetrazole-5-thiol is achieved during processing.

Abstract: This invention relates to a silver halide photographic material at least one gelatin layer of which contains a copolymer derived fromI vinyl acetate and another monomerIi an allyl or methallyl acyl acetate and optionallyIii a sulphonate with an allyl or methallyl group.The material can be hardened to a greater degree than the usual materials.

Abstract: The present invention relates to the production of hardened gelatin layers by means of quaternary carbamoyl pyridinium compounds. Preferably this method is used for the hardening of silver halide photographic material.

Abstract: A method of scanning a path on a surface by means of parallel beams of radiant energy whereby to scan at least one path across at least one surface which comprises directing at least two parallel beams of radiant energy to strike individually a like number of faces of a rotating mirror polygon as there are beams of radiant energy thereby deflecting the reflected paths of the said beams through angles equal to twice the angular subtense of each polygon face at the polygon center, the said parallel beams of radiant energy after reflection from the faces of the mirror polygon falling at least on one surface.

Abstract: The present invention relates to film base material. A film of synthetic linear polyester has superimposed thereon a phenoxy resin of the formula ##SPC1##Wherein each of R.sub.1 to R.sub.7 is a hydrogen atom or a lower alkyl or cyclohexyl group, R.sub.8 is a hydrogen atom or an acyl radical of the formula ##EQU1## wherein m is 0 to 6, at least one of X, Y and Z is a chlorine or bromine atom or a cyano group, the other of X, Y and Z are each hydrogen atoms or bromine or chlorine atoms, n is at least 50 and from 50 to 100 % of the R.sub.8 groups are a said acyl residue. An improved adhesion between the film base material of this composition and a hydrophilic layer coated thereon is achieved.

Abstract: A method and apparatus for drying polyethylene laminated base photographic paper in sheet form. The exposed and processed sheet of photographic paper bearing a photographic image on one side thereof is caused to travel through an enclosed drying chamber. Radiant heat is directed from sources onto both sides of the sheet of photographic paper as it is caused to travel through the drying chamber. The radiant heat is applied for sufficient time to cause any shallow indentation lines on the image side of the photographic paper to disappear. Simultaneously a stream of cool air is caused to flow over the image side of the photographic paper. Both sources are provided with means for directing the radiant heat on to each side respectively of the support.

Abstract: The present invention relates to a package comprising a stack of flexible light-sensitive sheet material. Four corner pieces of a strong material embrace the short side edges of the stack, the pack is placed in a rigid box, and spring means are provided in the closed box for urging each corner piece towards the diagonally opposite corner piece on the stack of sheet material.

Abstract: Cassette for a spool of photographic film, having a pair of lips through which the leading end of a roll of photographic film located in the cassette protrudes, the pair of lips consisting of an upper extended lip and a lower co-acting lip, the pair of lips leading to an internal extended peripheral slot through which the film is to be led, the slot consisting of an upper and a lower channel member, each channel member having an outer portion and a inner curved portion, the inner curved portion of the upper channel member forming part of the wall of the cylindrical cassette, the outer portion of the pair of lips being set at an angle to the cylindrical body of the cassette so as to constitute a tangent to a concentric circle which has a diameter of less than 0.8 of the internal diameter of the cylindrical cassette.