Hygromechanical behaviour of wooden panel paintings: classification of their deformation tendencies based on numerical modelling and experimental results

Heritage Science

Table 2 Schematic diagram of the most relevant geometrical parameters of the DK

The convention concerning positive (front face convex) and negative (front face concave) values of the cupping angle is also shown. Key to symbols; e: distance between the axes of the two columns, where they intersect the back face of the panel (variable in time); m: distance between the centres of the ball joints of the two transducers on the same column (constant, determined by construction); z: distance between the centre of the ball joint of the lower transducer and the back face of the panel along the axis of the column (constant, determined by construction) [28]