▁Lor ent z ' s ▁theory ▁of ▁electrons ▁ ▁Lor ent z ▁( 1 8 9 2 a ) ▁set ▁the ▁found ations ▁of ▁Lor ent z ▁a ether ▁theory , ▁by ▁assuming ▁the ▁existence ▁of ▁electrons ▁which ▁he ▁separated ▁from ▁the ▁a ether , ▁and ▁by ▁replacing ▁the ▁" Max well - H ert z " ▁Equ ations ▁by ▁the ▁" Max well - L or ent z " ▁Equ ations . ▁In ▁his ▁model , ▁the ▁a ether ▁is ▁completely ▁motion less ▁and , ▁contrary ▁to ▁F res nel ' s ▁theory , ▁also ▁is ▁not ▁partially ▁drag ged ▁by ▁matter . ▁An ▁important ▁consequence ▁of ▁this ▁notion ▁was ▁that ▁the ▁velocity ▁of ▁light ▁is ▁totally ▁independent ▁of ▁the ▁velocity ▁of ▁the ▁source . ▁Lor ent z ▁gave ▁no ▁statements ▁about ▁the ▁mechanical ▁nature ▁of ▁the ▁a ether ▁and ▁the ▁elect romagnet ic ▁processes , ▁but , ▁vice ▁vers a , ▁tried ▁to ▁explain ▁the ▁mechanical ▁processes ▁by ▁elect romagnet ic ▁ones ▁and ▁therefore ▁created ▁an ▁abstract ▁elect romagnet ic ▁ æ ther . ▁In ▁the ▁framework ▁of ▁his ▁theory , ▁Lor ent z ▁calculated , ▁like ▁He av is ide , ▁the ▁contra ction ▁of ▁the ▁electro static ▁fields . ▁Lor ent z ▁( 1 8 9 5 ) ▁also ▁introduced ▁what ▁he ▁called ▁the ▁" Theorem ▁of ▁Cor respond ing ▁States " ▁for ▁terms ▁of ▁first ▁order ▁in ▁. ▁This ▁theorem ▁states ▁that ▁a ▁moving ▁observer ▁( relative ▁to ▁the ▁a ether ) ▁in ▁his ▁" f ict it