Frederick Thomas Trouton and H. R. Noble, The Forces Acting on a Charged Condenser moving through Space (1903)
“ If a charged condenser be placed with its plane in the direction of the æther drift, then on the assumption that a moving charge develops a magnetic field, there will be associated with the condenser a magnetic field perpendicular to the lines of electric induction, and to the direction of the motion. If N be the electrostatic energy of the condenser, the magnetic energy produced when moving with velocity w through the æther with its plates parallel to the motion is N (w/v) 2, where v is the usual velocity of propagation. ”
