Na ka whakaahuatia e Lewis me Tolman (1909) te reciprocity o te wā dilation mā te whakamahi i rua karaka marama A me B, haere ki te tere whanaunga ki te tahi i te tahi. ngā karaka ngā o rua whakaata rererangi taurite ki tetahi ki tetahi, me te ki te raina o te nekehanga. i waenganui i nga whakaata he tohu marama e bounce, a mo te kaitirotiro okioki i roto i te tohutoro taua rite A, te wā o te karaka A ko te tawhiti i waenganui i nga whakaata wehea e te tere o te marama. engari ki te kite te kaitirotiro i te karaka B, ka kite ia e puta i roto i te karaka i roto i te tohu karaka, he tohu i roto i te karaka, B<unk> (Ives<unk>Stilwell whakamātautau). Na Lewis me Tolman (1909) whakaahuatia te reciprocity o te wā dilation mā te whakamahi i rua karaka marama A me B, haere ki te tere whanaunga ki te tahi i te tahi. Heoi, i roto i te pātai C (19192) i whakaatu hoki i te Lorent dilation, e
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