Mohr's circle [SEP] discoverer or inventor
Mohr's circle
Mohr's circle, named after Christian Otto Mohr, is a two-dimensional graphical representation of the transformation law for the Cauchy stress tensor.
Mohr's circle is often used in 
calculations relating to mechanical engineering for materials' strength, geotechnical engineering for strength of soils and, structural engineering for strength of built structures respectively. Examples of these are to be found in many soil mechanics textbooks such as "Smith's Soil Mechanics" by Smith and "Statics: Engineering Mechanics" by Bedford and Fowler
circle and the centre of the circle.
This double angle relation comes from the fact that the parametric equations for the Mohr circle are a function of formula_35. It can also be seen that the planes formula_80 and formula_81 in the material element around formula_7 of Figure 5 are separated by an angle formula_135, which in the Mohr circle is represented by a formula_136 angle (double the angle).
Mohr's circle for two-dimensional state of stress Finding stress components on an arbitrary plane Pole or origin of planes.
The second