Steorran worulde

A balance scale with a jar on each side. One side is for object-to-be-measured, other side is the counterweight side. Side for object-to-be-measured is lighter and must be filled with water to a certain level in order to balance the counterweight side. When balance is achieved, object-to-be-measured is completely submerged in the water. Volume of object is measured by how high the water rises. Water is added to other side to complete balance. Density is calculated by the ratio between displaced water and balancing water.