by LUIS RIOS CARBALLAL

The cylinder floats and truns into his axis, as the arrow shows. It takes the petroleum with the yokels, that, depending of the viscosity of the oil, are distributed in some way or another. When the higher part of the cylinder is exceeded and start to go down, some brushes cleans completly the petroleum and let it fall into the first compartment, from where is took and pumped into the receiving ship.