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On the trail of Fresnel’s Search for an Ether Wind
On the Trail of Fresnel’s Search
for an Ether Wind
Úlpio Nascimento
Av de Roma, 14
5° Dto, 1000 Lisboa, Portugal
A recollection is presented of the experiment in which Fizeau, back in 1851, proved
how the velocity of light propagation in moving water varies. In this experiment he
has also verified that such variation is in accordance with the equation proposed by
Fresnel in 1818. Reference is made to how since then numerous experimental verifi-
cations have given to that equation the extraordinary importance that it has still to-
day. The work in which Fresnel presents his ether partial-dragging hypothesis is re-
called. His equation is based on this hypothesis. The relativistic interpretation of that
equation is summarised.
An alternative model of the refraction mechanism is proposed based on the scatter-
ing concept of light radiation by atoms. The effect of the body movement aberration
on that scattering model is also presented. The model is applied to Fizeau and Mich-
elson experiments, which made it possible to conclude that the precision of the latter
was not enough to detect the ether wind. Reference is made to the Shamir and Fox
experiment (1969) in which a 6.64 km/s velocity was detected, i.e., about 22% of
the orbital velocity of earth (30 km/s). Nevertheless, the very authors and other rela-
tivity theory specialists have considered such result as negative.
Therefore, two experiments are suggested, which are likely to contribute to en-
lighten the problem: the first is similar to Shamir and Fox’s. In this experiment, the
optical fiber reels replace the apparatus arms. The second is an attempt to detect the
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