"In 1893 the formal development of electrodynamic theory from this point of view (by myself), inspired at the start by Fitzgerald's electric interpretation of MacCullagh's optical analysis, and by mechanical models based on Lord Kelvin's construction for a rotationally elastic ether, and resting directly on the single broad dynamical basis of the principle of Least Action ... was initiated in Great Britain; it was practically complete in 1897, running parallel in the main results, though not in method or mode of development, with Hendrik Lorentz's final presentation in his tract of 1895." Larmor