Abstract: This invention relates to a method of exposure control in photographic printing apparatus for printing from originals made on different types of photographic material, the method comprising:Determining which of at least two types (such as silver halide or diazo film) of photographic material the original employs by an examination of the spectral transmission characteristics of the original,Determining the image density of the original, andControlling the exposure in accordance with both the type of material as determined and the image density.

Abstract: A light-sensitive layer transfer material and such layer disposed on a carrier, for use in screen-printing stencils, printed circuit boards, integrated circuits, intaglio printing plates, relief printing plates, proof prints and the like, which comprises an alkali-soluble phenolic resin, such as phenol-formaldehyde novolacs, an ester or an amide of an o-naphthoquinone-diazide sulphonic acid, such as the p-cumyl phenyl ester of 1,2-naphthoquinone-2-diazide-4-sulphonic acid, etc., and an acrylic resin, such as a polymer of an alkyl ester of acrylic acid or methacrylic acid.

Abstract: In a photoprinting machine including a developing chamber in which a web of exposed diazotype paper continuously fed at an adjustable speed is developed with a developer medium composed of a vaporous ammonia/water mixture, an after-treating chamber following next in the direction of feed of the diazotype paper and which is connected with a device for removing ammonia-containing exhaust air, and a device for expelling developer medium from the developed diazotype paper. The expelling device includes a high energy infrared radiator positioned opposite the web in the after-treating chamber, a connection between the high-energy infrared radiator and an output of a heat output control device, and an input for the heat control device connected to a transmitter of the feed speed. The heat output control device having a characteristic such that the heat output of the high-energy infrared radiator is proportional to the feed speed and the color temperature of the high-energy infrared radiator is about 2000.degree.

Abstract: This invention relates to an improvement in an airplane having two superposedly-arranged upper and lower sweptback wings which together form a closed frame, with reference to a front view thereof, the improvement comprising a rhombic shape of the frame with the upper wing having a negative V-position and the lower wing having a positive V-position, both of the wings being rearwardly sweptback, and the upper wing being more markedly sweptback than the lower wing, and at least the leading edge of the upper wing being positioned forward of the lower wing.

Abstract: An apparatus for developing photosensitive material which comprises passing the material into a bath of circulating developer fluid at a relatively static portion thereof and discharging the material from the bath below the surface of the fluid through a nip between two squeeze rollers. The fluid is prevented from escaping from the bath at the discharge end due to the cooperation between a sealing lip on the lower guide plate of the bath and the nip formed by the squeeze rollers.

Abstract: This invention relates to a photopolymerizable copying composition comprising at least one binder, at least one photoinitiator, and at least one polymerizable compound having the formula ##STR1## wherein X is a saturated hydrocarbon group having 2 to 12 carbon atoms or an arylene group having 6 to 10 carbon atoms,R.sub.1 is an alkyl group having 1 to 3 carbon atoms, R.sub.4 or --CH.sub.2 R.sub.4R.sub.2 and R.sub.3 are H, CH.sub.3, or --CH.sub.2 R.sub.4,R.sub.4 is --O--CO--CR.sub.5 .dbd.CH.sub.2R.sub.5 is H or CH.sub.3, andn and m are integers from 0 to 4,R.sub.4 being present in at least one of the groups R.sub.1, R.sub.2, and R.sub.3.

Abstract: This invention relates to an improvement in a rotary piston machine of trochoidal construction having a piston mounted on an eccentric shaft in a housing delimited on both sides by side walls, said piston being rotated by a follower gearing, one part of which is rigidly connected with the piston, the improvement comprising eccentrically-rotatable shaft means in two bearing means which are eccentric with respect to each other and one of which is radially within the other, said shaft means supporting said piston and the part of the follower gearing rigidly connected therewith.

Abstract: This invention relates to a method for freely suspending a moving web of material in a gaseous medium, which comprises impinging a stream of the gaseous medium over the entire width of one surface of the web in order to produce a first stationary stable pressure zone, forming at least one stationary stable suction zone adjacent said first stationary stable pressure zone, deflecting the gaseous medium passing beyond the edges of the web in order to produce a second stationary stable pressure zone on the opposite side of the web, and regulating said pressure and suction zones in order to maintain the web in a freely suspended state. The invention also includes an apparatus for performing the method.

Abstract: This invention relates to an improvement in a device for adjusting an original to be copied, in particular an original which is repeatedly conveyed through the exposure station of a photocopying machine, including a transport mechanism with a deviatable transport band arrangement adapted to transport said original at a variable speed, and when said original is to be copied a number of times, in a closed path, further including a device for lengthening the path on one side, two switches positioned transversely and normal to the direction of flow and adapted to be actuated by the original whereby a switching circuit to a servomotor is closed when the leading edge of the original deviates from a correct position, said servomotor being connected to a correcting element adapted to change the length of the path of the original on one side of said transport band arrangement, the improvement comprising generator means adapted to put out a first signal proportional to the transport speed of said original, said servomo

Abstract: This invention relates to an improvement in a stepping motor, comprising a stator housing with electromagnets being annularly positioned therein, a flexible membrane rotatably mounted over said electromagnets on a bearing block shaft, said shaft being axially positioned within the stator housing, said membrane being a magnetically-conducting annular disc, adapted to act as a rotor, the improvement comprising race means whereby the membrane is prestressed on the side facing away from the electromagnets by pressing and its conically deformed by an amount coordinated to the step size and holding moment of the stepping motor, and including contact surface means corresponding with the race means on the one hand, and with the stator housing on the other hand, said surface means being equivalent at the upper side and the underside of the membrane.

Abstract: Apparatus for treating sheet material in which the sheet material is transported into at least one revolving brush rotating in a direction opposite to the direction of travel of the sheet material, particularly a lithographic plate processor in which a developer solution is applied to at least one side of the plate and the brushes remove unwanted coating from the surface of the plate, in which a guide plate having a length substantially equal to the width of the sheet material is mounted immediately in front of the brush, with respect to the direction of travel of the sheet material and adjacent the surface of the sheet material, and extends into the nip of the brush to a point just behind a plane through the axis of rotation of the brush.

Abstract: A method for automatically spraying a liquid on the surface of a moving object, particularly developer, rinse and gumming liquids on an exposed, photosensitive printing plate, in which the liquid is continuously supplied to a distribution line at a predetermined pressure, and simultaneously with the supply of liquid, the object is transported past a spray device connected to the distribution line. An impinging spray of the liquid is alternately applied to the object for a first predetermined period and the application is interrupted for a second predetermined period and the cycle is repeated a plurality of times during the passage of the object past the spray device, as by a solenoid valve mounted in the distribution line and a timer connected to the solenoid valve to open and close the same.

Abstract: This invention relates to an improvement in an engine suspension for aircraft having at least one bearing with a vertical thrust bolt which introduces into the aircraft cell shearing or tangential forces acting transversely to the longitudinal axis thereof, and a hoisting device for the engine assembly, the improvement comprising bearing means between the engine and the aircraft cell which bearing means permits vertical movement, anchoring means adapted to be attached to the engine, and detachable coupling means adapted to be connected between said anchoring means and said hoisting device, whereby a rigid connection for supporting said engine is produced.

Abstract: This invention relates to an improvement in a method for increasing the production of stretched flat film webs of thermoplastic material in which a melt of thermoplastic material is extruded from a slot die, the melt is solidified to form a film, the film is transversely stretched, the stretched film is heat-set, divided into narrower webs, and wound up, the improvement comprising extruding the melt from a slot die wider than the die normally employed for the production of a preliminary film, which usually corresponds to the width of a transverse stretching frame, dividing the melt in the longitudinal direction into at least two films, superposing the film webs, and transversely stretching said superposed webs. The invention also relates to an apparatus for performing the method.

Abstract: This invention relates to an improvement in the process for shirring cylindrical tubular casings, especially artificial sausage casings of synthetic material, in which an inflated casing is conveyed in the direction of its longitudinal axis and shirred, with pleating, against a counter-force by shirring forces acting upon the circumference of the casing, the improvement comprising that the forces acting upon the surface of the casing do so continuously and simultaneously, at equal intervals, at a plurality of points on at least two straight lines extending parallel to and symmetrically about the longitudinal axis of the casing, the action being at right angles to the longitudinal axis of the sausage casing, and circumferentially thereof, and, simultaneously, in the direction of the longitudinal axis of the casing, against said counter-force. The invention also relates to an apparatus for performing the process.

Abstract: This invention relates to an improvement in the process for the manufacture of water-absorbing, but largely water-insoluble cellulose ethers, wherein cellulose is etherified with a halogen fatty acid in an alkaline medium to which organic solvents may be added, to such an extent that without a further reaction a water-soluble cellulose ether would be produced, and wherein, prior to, during, or after etherification, a further reaction is carried out with a cross-linking agent which is polyfunctional towards cellulose in an alkaline reaction medium, the improvement comprising that chips of regenerated cellulose film are used as cellulose.

Abstract: This invention relates to an electrophotographic recording material consisting of an electroconductive support material and a photoconductive double layer of organic materials which consists of a homogeneous, opaque, charge carrier producing dyestuff layer and of a transparent top layer of insulating materials with at least one charge transporting compound.

Abstract: This invention relates to a process for introducing holes or straight or circular slots approximately normal to the surface in the vicinity of the surface of round timber and to an approximately predetermined depth for the purpose of facilitating the penetration of impregnating means into the surface zones of the timber to better protect against chemical and biological attacks.

Abstract: This invention relates to a vacuum rotatable tubular furnace for metallothermal reactions comprising an outer housing adapted to be evacuated and having one end thereof a closable filler cap, and a vacuum-tight passage for a shaft on the other end, rotatable tube means in said outer housing, said tube means being open on an end thereof facing said filler cap, and having a shaft connected to the other end of said tube and extending through said housing, a cylindrical reaction chamber mounted in said rotatable tube means symmetrically to the longitudinal axis of the latter, and being detachably connected thereto, said reaction chamber being narrowed on a filling end thereof to a tube having a small lumen and being closed at the other end thereof, a cylindrical evaporation chamber mounted in the area of the filling end of the reaction chamber and being adapted to contain metal effecting a metallothermal reaction, said evaporation chamber having an opening on an end thereof facing said filler cap, heating means o

Abstract: This invention relates to an improvement in the process for the transformation of comminuted cellulose ether, which has been rendered at least largely water-insoluble by modification, but which is still highly swellable with water, into an easily workable material, in which process the modified cellulose ether is attached to a hydrophilic support web, the improvement comprising dispersing the modified cellulose ether in a solution of unmodified cellulose ether in an organic solvent, coating the support on at least one of its surfaces with the dispersion, and then drying.