Abstract: An amphibian motor vehicle comprises a watertight engine room formed in a lower part of a vehicle body, an air intake opening formed at a front part of the vehicle body such that the air intake opening is positioned above water level when the amphibian motor vehicle cruises on water, an air passage separated from the engine room and generally extending in a longitudinal direction of the vehicle body from the air intake opening and a radiator disposed in the air passage for air cooling a coolant flowing into the radiator from the engine.

Abstract: A super-high contrast silver halide photographic material is disclosed, comprising a support having thereon at least one light-sensitive silver halide emulsion layer, wherein the emulsion layer or at least one other hydrophilic colloid layer contains at least one hydrazine derivative, at least one redox compound capable of releasing a development inhibitor by oxidation and at least one compound represented by formula (I):Q--SM (I)wherein Q represents a heterocyclic group containing at least one hydrophilic group bonded thereto directly or indirectly; and M represents a hydrogen atom, an alkali metal, a quaternary ammonium group or a quaternary phosphonium group. The material is suitable for photomechanical processes, giving sharp and super-high contrast line images and dot images with little black pepper therein. Enlargement or reduction of images is easy with the material.

Abstract: A silver halide photographic photosensitive material comprising a support, at least one silver halide emulsion layer on the support, a non-photosensitive hydrophilic colloid layer provided between the support and the at least one silver halide emulsion layer, and a backing layer provided on the side of the support which is opposite to the side having the at least one silver halide emulsion layer; wherein(a) the at least one silver halide emulsion layer contains silver halide grains having a grain size of not more than 0.2 .mu.m, and a silver chloride content of at least 90 mol %,(b) the non-photosensitive hydrophilic colloid layer contains a dye solid-dispersed in the form of fine crystals in the range of from 10-80 mg/m.sup.2, and(c) the backing layer has an absorbance at 340-380 nm of from 0.30-0.90. A method for processing the silver halide photographic photosensitive material is also disclosed.

Abstract: There is disclosed a silver halide photographic material which can satisfy the specific properties required for dot to dot work photographic materials and can be handled under an environment of a bright room. The silver halide photographic material comprises a support, having provided thereon at least one light-sensitive silver halide emulsion layer and having provided farther from the support than the emulsion layer a light-insensitive hydrophilic colloid layer. The light-insensitive hydrophilic colloid layer contains at least a solid dye which is dispersed in the form of fine particles and further may contain a water soluble dye. The silver halide grains contained in the light-sensitive emulsion layer have an average grain size of 0.15 .mu.m or less and contain therein at least 1.times.10.sup.-7 mole per mole of a silver of transition metal selected from the elements of groups V to VIII of the Periodic Table.

Abstract: A direct positive type silver halide photographic light-sensitive material is disclosed, having improved safelight stability and which is capable of providing an image having excellent photographic properties. The light-sensitive material comprises a support having thereon at least one pre-fogged light-sensitive silver halide emulsion layer and at least one light-insensitive hydrophilic colloid layer provided farther from the support than the light-sensitive silver halide emulsion layer. The light-insensitive hydrophilic colloid layer contains a dye dispersed therein in the form of microcrystalline particles.

Abstract: Disclosed is a high-sensitive and super-high contrast silver halide photographic material suitable to use in photomechanical process. The material comprises a support having thereon having at least one light-sensitive silver halide emulsion layer and another hydrophilic colloid layer, wherein at least one of the emulsion layer or the other hydrophilic colloid layer contains a hydrazine derivative and a redox compound capable of releasing a development inhibitor by oxidation and further contains at least one hardening agent represented by formula (A): ##STR1## wherein R represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group or a substituted or unsubstituted aryl group; and n represents 0 or 1.

Abstract: A silver halide photographic material is disclosed, comprising a support having on one side thereof (1) at least one light-sensitive silver halide emulsion layer and (2) at least one light-insensitive hydrophilic colloid layer containing a dye dispersed in the form of fine solid particles in which the light-sensitive silver halide emulsion layer is located between the support and the light-insensitive layer; and having on the other side thereof at least one light-insensitive backing layer, wherein the backing layer has a absorbance at 320 to 400 nm of 0.50 to 0.90.

Abstract: A method of forming an image comprising the steps of (a) imagewise exposing a silver halide photographic material to light substantially having no wavelengths of less than 370 nm, the silver halide photographic material comprising: (i) a support, (ii) at least one light-sensitive silver halide emulsion layer formed on the support, (iii) at least one other hydrophilic colloid layer, and (iv) a redox compound that releases a development inhibitor when oxidized in at least one of the at least one light-sensitive layer or the at least one hydrophilic colloid layer; and (b) processing the exposed silver halide material from step (a) to produce a .tau. value of at least 10.0. The redox compound is a compound represented by formula (I): ##STR1## wherein A.sub.1 and A.sub.

Abstract: A method for forming an image is disclosed, comprising imagewise exposing a negatively working silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer with light having a wavelength of from 460 to 600 nm and containing substantially no light having a wavelength of 360 nm or less, said emulsion layer containing at least one sensitizing dye having an absorption maximum (.lambda..sub.max) at a wavelength of form 450 nm to 580 nm, and said emulsion layer or other hydrophilic colloidal layer containing at least one hydrazine derivative. The method provides an image having excellent image quality either in enlargement or reduction work without causing reduction in sensitivity or inducing black pepper.

Abstract: A silver halide photographic material comprising a support having thereon at least one sensitive silver halide emulsion layer, wherein said emulsion layer comprises a monodisperse emulsion and said emulsion layer or other hydrophilic colloid layer contains at least one hydrazine derivative and at least one redox compound capable of releasing a development inhibitor when oxidized.

Abstract: A negative silver halide photographic material comprising a support having thereon at least one light-sensitive silver halide emulsion layer containing a silver halide emulsion containing regular silver halide grains containing from 0.3 mol % to 3.0 mol % of silver iodide, the silver halide grains being produced by conversion of silver halide host grains using high silver iodide silver halide grains having a silver iodide content of at least 90 mol % in an amount sufficient to provide from 0.1 mol % to 2.5 mol % of silver iodide based on the total silver halide content of the silver halide host grains and the high silver iodide grains.The photographic material containing silver halide grains having a novel structure provides a negative image having excellent photographic characteristics, particularly high sensitivity and ultrahigh contrast.A method of forming an ultrahigh contrast image which is excellent in line image quality using a stable developing solution is also disclosed.

Abstract: A silver halide photographic material comprising a support having thereon at least one light-sensitive layer comprising a silver halide emulsion sensitized by an infrared sensitization dye, wherein the silver halide in the silver halide emulsion contains at least 90 mol % of silver chloride and is constituted by monodisperse grains having a coefficient of variation of not more than 20%; and an image formation method using the above-described silver halide photographic photosensitive material, comprising the steps of imagewise exposing the photographic material and developing the said material in a developing solution containing at least 0.15 mol/l of sulfurous acid ions and a compound having a silver halide-adsorption accelerating group.

Abstract: A negative type silver halide photographic material is disclosed. The material comprises a support having provided thereon at least one silver halide emulsion layer containing silver halide grains sensitized with gold and sulfur sensitizers, the emulsion layer or at least one other hydrophilic colloid layer containing at least one high contrast-imparting hydrazine derivative and at least one compound represented by the following general formula (I): ##STR1## wherein Z represents N or C--X wherein X represents a substituted or unsubstituted alkyl or aryl group, Y represents a substituted or unsubstituted alkyl or aryl group, and M represents a hydrogen atom, a metallic atom, or ammonium which may be substituted.

Abstract: A process for developing a silver halide photographic material having, on a support, at least one silver halide emulsion layer comprising a silver halide emulsion spectrally sensitized by an infrared-sensitizing dye, which is subjected to image-wise exposure, then development and fixing processing and then washing or stabilization processing, wherein the silver halide in the silver halide emulsion layer contains 90 mol % or more of silver chloride, the swelling rate for hydrophilic colloid layers containing the silver halide emulsion layer is 150% or less, and the replenishment in the washing or stabilization processing is 1,200 ml or less per square meter of the photographic material.

Abstract: A method of forming a direct positive image comprising:(a) imagewise exposing a direct positive silver halide photographic material composed of a support having thereon at least one light-sensitive silver halide emulsion layer containing non-prefogged internal latent image silver halide grains, at least one hydrophilic colloidal layer of the material containing a nucleating agent, and at least one sensitizing dye represented by formulae (I), (Ia), (Ia'), or (Ib): ##STR1## wherein Z and Z.sub.1 each represents a non-metallic atomic group necessary for forming a 5-membered or 6-membered nitrogen-containing heterocyclic ring; R and R.sub.1 each represents a substituted or unsubstituted alkyl group or an aryl group; Q and Q.sub.1 represent a non-metallic atomic group necessary for forming together a 4-thiazolidinone group, a 5-thiazolidinone group or a 4-imidazolidinone group; L, L.sub.1 and L.sub.2 each represents a methine group or a substituted methine group; n.sub.1 and n.sub.

Abstract: A silver halide photographic light-sensitive material is described, comprising a support, at least one light-sensitive silver halide emulsion layer on the support, and at least one light-insensitive top layer provided on the emulsion layer, wherein at least one of the emulsion layer and other constituent layers contains a compound represented by the general formula (I)R.sup.1 --NHNH--G--R.sup.2 (I)wherein R.sup.1 is a substituted or unsubstituted aryl group, R.sup.2 is a hydrogen atom, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted aryloxy group, and G is a carbonyl group, a sulfonyl group, a sulfoxy group, a phosphoryl group, or an N-substituted or unsubstituted imino group and wherein said at least one light-insensitive top layer is hardened so as to have a melting time at least 50 seconds longer than that of the emulsion layer.

Abstract: Silver halide photographic material and method of forming an image using the same are disclosed. The material comprises one or more silver halide emulsion layers on a support, with a hydrazine derivative and a developing agent being incorporated in at least one of said emulsion layers. The image forming method comprises performing imagewise exposure of the above-described photographic material and developing said material with a developing solution that contains sulfite ions in a concentration of not less than 0.15 mole per liter and which has a pH within the range of from 9.5 to 12.3, and provides a supercontrasty negative image that has a very contrasty photographic characteristic of a gamma (.gamma.) of 10 or more and which is not highly susceptible to the occurrence of "black spots".

Abstract: A silver halide photographic material is disclosed, which comprises at least one silver halide emulsion layer on a support, at least one of the emulson layer and other layers contains at least one hydrazine derivative and at least one of these layers contains at least one compound having both a silver halide adsorbing group and an acid group represented by the general formula (I):C-L-D (I)wherein C represents a group that enhances adsorption to silver halide, D represents an acid group, and L represents a divalent linking group,and possessing substantially no absorption maximum in the visible region. A method for forming superhigh contrast negative images is also disclosed, comprising imagewise exposing this silver halide photographic material, followed by developing with a developing solution containing sulfite ions in an amount of about 0.15 mol or more per liter and having a pH of about 10.5 to about 12.3.

Abstract: A silver halide photographic material is disclosed, comprising a support having thereon at least one hydrophilic colloid layer at least one of which must be a gold- and sulfur-sensitized silver halide emulsion layer, said silver halide emulsion layer containing from 0.1 to 3.0 mol % silver iodide per mol of silver, wherein said silver halide emulsion comprises silver halide grains having a substantial core/shell structure wherein the silver iodide content in the shell is less than that in the core, and the silver halide emulsion layer or other hydrophilic colloid layer contains a polymer represented by the formula (I)--(A).sub.x (B).sub.y (C).sub.

Abstract: An image-forming process which comprises after imagewise exposing a silver halide photographic material having at least one silver halide emulsion layer composed of silver halide grains containing at least 1.times.10.sup.-6 mol of a rhodium salt per mol of silver and having a mean grain size of not larger than 0.15 .mu.m with a developer meeting the following conditions (a) to (d);(a) the developer substantially contains dihydroxybenzene only as the developing agent,(b) the developer contains at least 0.18 mol/liter of a free sulfite,(c) pH thereof is at least 10.5, and(d) the developer contains at least 20 mg/liter of a compound represented by formula (I): ##STR1## wherein X.sub.1 represents a hydrogen atom or a nitro group and X.sub.2 and X.sub.3 each represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms.