(57) @ Device suitable for detecting changes of the state of rest or of rectilinear uniform
motion of a body, composed of a hollow member (1) rigidly joined to said body and
containing one or more mobile elements (2), of suitable means (7) for emitting ultra-sounds
of a determinate frequency into the interior of the hollow member, and of suitable
transducers (8) for receiving said ultra-sounds, so that by any changes of the state
of the body the interior element or elements (2) move relative to the hollow member
(1) and cause for this reason a change of frequency of the ultra-sounds picked up
by said receiving transducers (8).
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