Sur un effet physique attribuable uniquement au potentiel vecteur en   \'{e}lectromagn\'{e}tisme classique
  We present the theory, the design and the discussion of an experiment which allows to choose between the local formulation of Riemann-Lorenz and the non-local formulation of Heaviside-Hertz in order to describe Classical Electromagnetism. 
Germain Rousseaux (INLN), Richard Kofman (LPMC), Olivier Minazolli   (LPMC)