This scientist's Researches on the Force of Torsion and Elasticity of Metal Wires outlines his theory of dry friction, which can be used with Amontons' law.  
This person's namesake gauge gives rise to transverse current by imposing the condition that the vector potential is solenoidal. This scientist's Researches on the Force of Torsion and Elasticity of Metal Wires outlines his theory of dry friction, which can be used with Amontons' law.  That work also contains designs for a torsion balance, which he would use to prove his most famous result, published in his 1785 Memoirs on Electricity and Magnetism.  FTP name this Frenchman whose eponymous inverse square law defines the electrostatic force between two charged particles, who is also the namesake of the SI unit of charge.
This person's namesake gauge gives rise to transverse current by imposing the condition that the vector potential is solenoidal.
Charles-Augustin de Coulomb