Drawings, theory of water pressure in a vessel by Joshua Walker Three figures relating to experiments on water pressure within the body of text. Figure A consists of a vessel shaped as a upside down T. Figure B is a empty box like vessel Figure C is a pipe which extends upwards on tope ends. Text undeneath the figures states 'If these 3 vessels A, B & C be all of an equal height, & have bottoms of equal breadth; then when they are filled with water, the bottome of A or C will be as much pressed with the water as the bottome of B.' Subject: Physics 24 November 1685