Abstract: The device for roping down includes a shaft 2 with a central portion which forms a reel 5 for coiling up band rope 6. The two end sections of shaft 2 form brake rotors 9 and 10, which are equipped with wings 11. The wings 11, which rotate during the uncoiling of the band rope operate in brake chambers 31 enclosed by brake housings 12 and 13, these brake chambers being partly or completely filled with sand.In case of roping down, braking devices 7 and 8 operate automatically and produce a comparatively high braking power which heavily increases as the rate of descending increases. Thus, a constant roping-down rate as a function of the respective load is achieved which rate is used for a safe impact on the ground.

Abstract: A recording medium comprises a photographic plate and an aperture-raster plate parallel to but spaced from the photographic plate. The aperture-raster plate is provided with a honeycombed pattern of small apertures. Light emanating from an illuminated object is directed toward the side of the recording medium provided with the aperture-raster plate, and the constituent light rays pass through the apertures and are registered upon the photographic plate both with respect to intensity and direction. Thereafter, the photographed object is three-dimensionally reproduced by illuminating the recording medium with incoherent light incident upon the recording medium in the direction opposite to that in which the observer of the reproduction views the recording medium.