Detection of the rotation of the earth with a superfluid gyrometer

. In-terferometric techniques exploiting the wave-mechanicalnature of light beams—the Sagnac effect [2]—of neutron[3] and electron [4] beams have been devised in orderboth to demonstrate the general laws of inertia and to im-prove gyrometric techniques [5]. We describe below anexperiment [6] which has been considered by a number ofauthors [7–11] and in which the effect of V