Watch the video above to see the experiment performed.

For the double hull vessel and the buoy, identify the water plane shape (indicated by the red line) and determine the submerged volume (V).

With the unloaded vessel afloat and steady, measure the residual (angular) deviation of the central mast. Apply a small weight w_j at distance dx along the horizontal arm to produce an (angular) deviation of the central mast of less than 8°. Measure the arm distance to the centre of weight w_j and determine the angle of list (i.e. deviation with load w_j less residual deviation).