Abstract: A device for dispersing in the atmosphere a residual gas, especially a residual gas containing gaseous hydrocarbons, comprises an open ended mixing conduit having two end sections, at least one injection nozzle assembly each of which comprises at least one nozzle opening into an injection zone defined in the vicinity of at least one of the mixing conduit end sections. Each nozzle of each assembly is connected to a conduit which is connected, in turn, to a common source of pressurized residual gas, and the nozzles of the various assemblies are distributed in the injection zone, and constructed in such a manner that the ratio of the square root of the passage section of said mixing conduit to the square root of the sum of the passage sections of said nozzles of the various assemblies is comprised between 35 and 300.

Abstract: A miniature volumetric pump for determining the thermodynamic characteristics of oil effluents comprising a hollow cylinder and a piston moving in a straight line relative to the cylinder. The pump is characterized in that the piston is stationary and secured to the pump frame and in that the cylinder can move in a straight line with respect to the frame and is adapted to receive the piston in sealing-tight manner in its bore, the pump comprising a screen device for moving the cylinder.