To show that the pressure of liquids varies with depth and not the shape of the vessel with glass vessels of 4 different shapes mounted in leak proof metallic collars mounted on a metal base. With plastic bowl.

Having 220mm long x 8mm inside diameter glass tubes one is closed at the top and other one is opened. The lower ends of tubes are drawn out and connected together by 1.5m of rubber pressure tubing 10mm outside diameter x 5mm inside diameter.