, ▁Vo igt ' s ▁work ▁was ▁completely ▁ignored ▁by ▁his ▁contempor aries . ▁ ▁Fitz G er ald ▁( 1 8 8 9 ) ▁offered ▁another ▁explanation ▁of ▁the ▁negative ▁result ▁of ▁the ▁Michel son – Mor ley ▁experiment . ▁Con tr ary ▁to ▁Vo igt , ▁he ▁spec ulated ▁that ▁the ▁inter m ole cular ▁forces ▁are ▁possibly ▁of ▁elect rical ▁origin ▁so ▁that ▁material ▁bodies ▁would ▁contract ▁in ▁the ▁line ▁of ▁motion ▁( length ▁contra ction ). ▁This ▁was ▁in ▁connection ▁with ▁the ▁work ▁of ▁He av is ide ▁( 1 8 8 7 ), ▁who ▁determined ▁that ▁the ▁electro static ▁fields ▁in ▁motion ▁were ▁de formed ▁( He av is ide ▁Elli ps oid ), ▁which ▁leads ▁to ▁phys ically ▁und et erm ined ▁conditions ▁at ▁the ▁speed ▁of ▁light . ▁However , ▁Fitz G er ald ' s ▁idea ▁remained ▁widely ▁unknown ▁and ▁was ▁not ▁discussed ▁before ▁Oliver ▁L odge ▁published ▁a ▁summary ▁of ▁the ▁idea ▁in ▁ 1 8 9 2 . ▁Also ▁Lor ent z ▁( 1 8 9 2 b ) ▁proposed ▁length ▁contra ction ▁independently ▁from ▁Fitz G er ald ▁in ▁order ▁to ▁explain ▁the ▁Michel son – Mor ley ▁experiment . ▁For ▁pla us ibility ▁reasons , ▁Lor ent z ▁referred ▁to ▁the ▁anal ogy ▁of ▁the ▁contra ction ▁of ▁electro static ▁fields . ▁However , ▁even ▁Lor ent z ▁admitted ▁that ▁that ▁was ▁not ▁a ▁necessary ▁reason ▁and ▁length - cont raction ▁consequ ently ▁remained ▁an ▁ad ▁h oc ▁hypothesis . ▁