Asi kusiyana nehukuru hwekunyepedzera hwakatangwa naPoincaré, akafunga kuti chaive chinhu chaicho. Abraham akacherechedzawo (senge Lorentz muna 1899) kuti huwandu uhu hunoenderanawo nedanho uye akagadzira mazita ekuti "Longitudinal" uye "Transverse" Mass. Kusiyana naLorentz, haana kuisa Contraction Hypothesis mune yake dzidziso, uye nekudaro mazwi ake ehuwandu akasiyana neaLorentz. Zvichienderana nebasa rapfuura pamagetsi emagetsi, Friedrich Hasenöhrl akataura kuti chikamu chehuremu hwemuviri (hwaakadana kuti chiratidzo chechiratidzo) chinogona kufungidzirwa semwaranzi inoputika yakatenderedza gomba. "Chiedza chechiratidzo" chemwaranzi chinoenderana netembiricha (nekuti anoburitsa radiation) uye chinoenderana nesimba rayo.
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