Abstract: A stereoscopic camera contains a photosensitive medium to be exposed by two juxtaposed images on either side of a symmetry plane, two first symmetrical lenses centered perpendicularly to the centers of images and spaced from a small stereoscopic base, and two second symmetrical lenses designed for photography with a large stereoscopic base. So as to record a stereoscopic couple always in a same position on the medium, preferably having dimensions of a standard slide, whatsoever one of three selected stereoscopic bases, the second lenses are located on second optical path sections between and perpendicular to optical axis of the first lenses and first optical path sections spaced from the large base, and the camera comprises reflecting means along axis of the first lenses for focusing incident optical beams having crossed through the second lenses. The reflecting means includes two central pivotable totally-reflecting or fixed semi-reflecting mirrors, and two fixed side mirrors.

Abstract: A rearview device for a helmet or the like, comprising an optical system mountable on said helmet and including an objective lens which, in use, is directed rearwardly of the wearer of the helmet for receiving light from an object to the rear of the wearer and forming an image of said object, an eyepiece lens for enabling the wearer of the helmet to view said image, and laterally and vertically inverting reflector means in the path of light rays passing through said objective lens and said eyepiece lens so that the image of said rearview object that is viewed by the wearer of the helmet is erect and without inversion, in which the reflector means includes two plane reflectors disposed perpendicular to each other and meeting in a line which lies in a plane substantially parallel to and spaced from a plane in which the optical axis of the objective lens lies.

Abstract: The invention relates to a small surface liquid decantation apparatus and process for making same.The decantation apparatus consists of a main tank of revolution (1) with a central inlet (8), an exhaust (3) of the decanted products by the bottom and an exhaust (13) on the upper peripheral edge for the purified liquid. The main body (1) comprises annular compartments defined laterally by coaxial walls of revolution (4 to 7) and in communication with the lower portion of the main body (1), provided with an exhaust (3). An indented zone (11, 13 to 17) forming an overflow channel for exhausting the upper layer of purified liquid is provided in the upper edge of each wall (4 to 7). Said indented zones (11, 13 to 17) are substantially diametrically opposite each other from one wall to the next.Current applications for decantation.