| http://www.w3.org/ns/prov#value | - In a camera having a front wall, an objective in said front wall, a shaft, a photo-electric cell unit, means in the camera front wall for admitting light to said photo-electric cell unit, said unit including a drive for oscillating said shaft in correspondence with the variation of the light impinging the photo-electric cell, a segment shaped screen of a transparency decreasing from one of its end
|
