Abstract: A system of inscription on the marginal part of a perforated cinematographic film, of coded information and for reading this information, comprises, for inscription, an assembly of a plurality of light sources adjacent one another, disposed transversely opposite the marginal part of the cinematographic film. A write-in device selectively controls at each instant, the lighting of certain light sources, from among all of them, for the inscription on the film, in coded form, of a plurality of dots aligned transversely in a column. The system also comprises, for reading the coded information inscribed on the film, an assembly of photo-sensitive elements, adjacent one another, extending transversely opposite the marginal part of the film bearing the coded information. Means and provided for recognizing and identifying the combinations of dots inscribed on the film and corresponding to the various characters of information.

Abstract: Means for gripping and releasing tools and attachments used with a machine tool, especially a grinding machine equipped with a form grinding head, comprising a grinding wheel adaptor (22) a dresser roll cartridge (14) both provided with end compartments (25, 54) having a slot (35) adapted to be engaged by collet-type gripping apparatus (36) being part of maneuvering apparatus (37) also comprising a thrusting apparatus (40) adapted to selectively actuate locking apparatus (27) for the grinding wheel adaptor (22) on the spindle and locking apparatus for the dresser roll cartridge (14) on a movable support.

Abstract: A device for automatically metering and displaying the footage of delivered film contained in each of a plurality of interchangeable magazines adapted to be mounted on the body of a cinematographic camera comprises, on each magazine, an assembly of coded identification marks peculiar to each magazine. On the body of the camera, there is provided a device for reading and identifying the various assemblies of coded marks borne by the various magazines. The camera includes a memory with a plurality of zones allocated respectively to the various magazines and permanently containing information relative to the footage of flim consumed in each magazine. The camera also includes a microprocessor receiving signals coming from the device for identifying the magazines, as well as a metering pulse emitted by a pulse generator coupled to the motor driving the film and emitting a pulse for each image.

Abstract: A film exposing equipment such as motion picture cameras and still cameras is equipped with photometric devices measuring the quantity of light falling upon the film to be exposed. The display device showing the user the measurement result comprises a succession of light emitting diodes adjacent to each other, determining the measuring scale, these diodes being powered and hence lit up at all times with the exception of the single diode among them, which, unlit, constitutes the mark giving the measurement result. The succession of light emitting diodes comprises at predetermined intervals, specific diodes different from the other diodes by their dimensions and/or colors, constituting specific marks on the measurement scale.

Abstract: A moving picture camera with interchangeable film magazine comprises in each magazine, a take-up roll on which is wound the exposed film, and an electric motor rotating this roll.A measuring device is provided for measuring the speed of rotation of the take-up roll and for delivering a first signal representing this speed of rotation. A computer circuit receiving at its inputs said signal and a signal representing the image cadence selected and another signal representing the desired tension for the film, delivers at its ouptut a signal representing the value of the intensity of the electric current supplied to the motor, so that the required mechanical power, in other words the useful electric power supplied by this motor, is constant, for a selected image cadence and a desired film tension.