It comprises three independent mechanisms. The first measures the axial bulges (buckling), recording the displacements thereof on scale paper with tracing paper incorporated, it being possible for the latter to be removed in order to be studied and repositioned. It consists of a sliding, rectangular-shaped shaft which has a point of rest achieved by four elastic springs placed at the mid-point of said shaft. At the same height, it has contacts for opening or closing an electrical signalling circuit, as a function of said displacements. The shaft is supported at an average height of the rail. The second mechanism measures the perpendicular bulges, recording the displacements thereof with a system analogous to the first system, but supported on the lower base of the rail. The third mechanism is hygrometric with float (buoyancy) mechanism and alert (warning) upon the passage of the train at a suitable distance. It applies to railways.
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