Abstract: This movement compensation arrangement in one aspect comprises a hydraulic main motor group driven by the pressure difference between two hydropneumatic pressure containers and a hydraulic auxiliary motor group driven by a pump with an effect which can be regulated, and adapted to provide for dynamic compensation. The hydraulic main motor group is adapted to substantially take up the static load. The two motor groups are rotationally coupled to moving means. A control unit in response to input signals controls both motor groups, of which the main motor group has a stepwise and/or continuously variable displacement (FIG. 1).

Abstract: Measuring apparatus for determination of the level of a boundary layer between oil and water in a tank, comprising electrical sensing units distributed vertically in the tank and adapted to be responsive to the liquid and to deliver measuring signals to electrical measuring circuits with associated display devices for indicating and possibly recording the level. The sensing unit comprises thermo-couples each having a measuring junction part mounted in good thermal contact with a body of a material having good heat conducting properties, which body is adapted to be in good thermal contact with the surrounding liquid, and an electrical heating resistor being also in good thermal contact with the body and adapted to be supplied with a suitable electrical current.