A cylinder of mass M and average density d1 is lowered into a vessel of cross-sectional area A, half full of liquid of density d2d2

The volume of liquid displaced when the cylinder is immersed=Md1 Resultant upward thrust =Md1×d2g∴  Thrust on liquid surface =Md1×d2g (Newton's third law) This thrust is experienced by bottomIncrease of pressure at bottom=Md2gd1A