The Da Vinci Notebooks at sacred-texts.com
I ask the weight [pressure] of this man at every degree of motion on these steps, what weight he gives to b and to c.
184 Observe the perpendicular line below the centre of gravity of the man.
196:184 8: These lines are, in the original, written in ink
196:185 : See Pl. XXIII, No. 2.