Willem einthoven biography of albert einstein
Painting of Hendrik Lorentz by Menso Kamerlingh Onnes, Portrait by Jan Veth Lorentz' theory of electrons. Formulas for the Lorentz force (I) and the Maxwell equations for the divergence of the electrical field E (II) and the magnetic field B (III), La théorie electromagnétique de Maxwell et son application aux corps mouvants, , p.