Abstract: A method and apparatus for apportioning a primary volume of fluid into a plurality of secondary volumes having a predefined mutual relationship, by means of a chamber for receiving the primary volume of fluid having a bottom including fluid evacuation orifices (6) disposed in a common horizontal plane and connected to evacuation ducts (8) provided with cocks (19), enabling the beginning of fluid flow in the ducts (8) to be synchronized, with the end of said flow being determined by the free surface (26) of the fluid being fractioned by the evacuation orifices (6).

Abstract: This collector comprises a reflector (1) formed by a plurality of reflecting elements (6) engaged between consecutive frames (2). Each of the frames is formed by two members (7) moulded from Zanak and fixed to an aluminium beam (11) having a triangular cross-sectional shape. Each pair of members (7) defines arms (17) whereby the reflector is rotatively mounted on a fixed absorber tube (3). The latter is protected by a transparent hood (28) fixed on supports (4) disposed on each side of the reflector. A device (34, 35, 37) for adjusting the angular position of the reflector is provided at at least one end of the collector.