Abstract: The invention relates to a device for the partial crystallisation of a phase in a solution, comprising at least one pump for circulation of the solution in a circuit of a heat exchanger formed from at least one tube in contact with a cooling circuit, characterised in that the circuit of the exchanger includes static means to mix the solution, so that the crystallised particles of the phase are continuously mixed with the solution during the circulation of said solution. The invention also relates to an assembly including several devices according to the invention or several parts of such a device. The invention also relates to a method to use such a device.

Abstract: The deformations of an object subjected to stresses are measured, said object being, for example, an inertia wheel revolving at high speed inside a vacuum chamber, light pulses emitted by a stroboscope and synchronized with the rotation speed of the object are directed onto this object. The still frames or freezes thus formed are issued from the chamber through a circular aperture via a first large focal length objective. On the full scale real images thus obtained within a plane, a reticule is superimposed and the images of the object and of the reticule are increased by means of a second objective. A video camera connected to a screen and a recorder makes it possible to directly display and/or store the images of the deformations sustained by the object.