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Hace 18 horas · Unprotected experiments in the U.S. in 1896 with an early X-ray tube ( Crookes tube ), when the dangers of radiation were largely unknown. [1] The history of radiation protection begins at the turn of the 19th and 20th centuries with the realization that ionizing radiation from natural and artificial sources can have harmful effects on living ...
Hace 18 horas · Snow White and the Seven Dwarfs (1937) trailer clip with multiplane effects To create an impression of depth , several techniques were developed. The most common technique was to have characters move between several backgrounds and/or foreground layers that could be moved independently, corresponding to the laws of perspective (e.g. the further away from the camera, the slower the speed).
