▁artificial , ▁because ▁no ▁experiment ▁can ▁distinguish ▁between ▁them . ▁Yet ▁according ▁to ▁C ohn ' s ▁own ▁theory , ▁the ▁Lor ent z ▁transformed ▁quantities ▁would ▁only ▁be ▁valid ▁for ▁optical ▁phen omena , ▁while ▁mechanical ▁clock s ▁would ▁indicate ▁the ▁" real " ▁time . ▁ ▁Po inc ar é ' s ▁dynamics ▁of ▁the ▁electron ▁▁ ▁On ▁June ▁ 5 , ▁ 1 9 0 5 , ▁Henri ▁Po inc ar é ▁submitted ▁the ▁summary ▁of ▁a ▁work ▁which ▁closed ▁the ▁existing ▁g aps ▁of ▁Lor ent z ' s ▁work . ▁( This ▁short ▁paper ▁contained ▁the ▁results ▁of ▁a ▁more ▁complete ▁work ▁which ▁would ▁be ▁published ▁later , ▁in ▁January ▁ 1 9 0 6 .) ▁He ▁showed ▁that ▁Lor ent z ' s ▁equations ▁of ▁elect rod ynam ics ▁were ▁not ▁fully ▁Lor ent z - cov ari ant . ▁So ▁he ▁pointed ▁out ▁the ▁group ▁characteristics ▁of ▁the ▁transformation , ▁and ▁he ▁corrected ▁Lor ent z ' s ▁formulas ▁for ▁the ▁transformations ▁of ▁charge ▁density ▁and ▁current ▁density ▁( which ▁implicitly ▁contained ▁the ▁relativ istic ▁velocity - add ition ▁formula , ▁which ▁he ▁elabor ated ▁in ▁May ▁in ▁a ▁letter ▁to ▁Lor ent z ). ▁Po inc ar é ▁used ▁for ▁the ▁first ▁time ▁the ▁term ▁" L or ent z ▁transformation ", ▁and ▁he ▁gave ▁the ▁transformations ▁their ▁symmet rical ▁form ▁used ▁to ▁this ▁day . ▁He ▁introduced ▁a ▁non - elect rical ▁binding ▁force ▁( the ▁so - called ▁" Po inc ar é