| 
                Water tank 
                        
                            | Material: | 10mm thick acrylic
                            board |  
                            | Height: | 6cm |  
                            | Depth: | 6cm |  
                            | Width: | 195cm |  The tank was set on a tripod for heavy
                    camera so that it can be tilted at an
                    arbitrary angle. This tank is about half size of Thorpe's
                    experiment.3)
Working Fluid Salt water and pure water  Visualization Ink was mixed with the salt and pure water,
                    making the boundary layer visible.  Experimental process The same amount of salt and pure water are
                    poured into the tank, which is then placed
                    exactly horizontal. The tank is then tipped
                    at an angle when the boundary layer has
                    settled.  |   |