Abstract: Method of evaluation a performance of a surface of a material, the method comprising steps of: measuring a first surface profile of a material sample along a predetermined track by bringing a tip of a stylus into contact with a surface of the sample and traversing said tip across the surface of the sample in a direction tangential to the tip of the stylus while recording said first surface profile, subsequently; applying a normal force to the surface of the sample with the stylus, said normal force being in a direction substantially perpendicular to the surface of the sample, subsequently; moving said tip across the surface of the sample following at least part of said predetermined track while applying said normal force, subsequently; measuring a second surface profile of said sample along at least part of said predetermined track by bringing said tip into contact with the surface of the sample and traversing said tip across the surface of the sample along said track while recording said second surface pr

Abstract: A method for analyzing a scratch from a scratch test includes (a) locating the beginning of the scratch relative to a reference position, (b) making the scratch on a bulk with an indenter while recording the applied force and at least one measurement parameter, as a function of the displacement of the indenter relative to the reference position, (c) acquiring and recording images of the scratch relative to the reference position, (d) synchronizing the recorded images, the applied force and the measurement parameter, as a function of the displacement of the indenter, (e) displaying curves of the applied force and of the measurement parameter as a function of the displacement of the indenter, and (f) displaying in a synchronized way an image of the scratch reconstructed from the recorded images.

Abstract: The invention relates to a method for analyzing a scratch from a scratch test, applying a digital image acquisition device, a bulk and an indenter for applying a force on the bulk, the method comprising the following steps: determining the position of the beginning of the scratch relatively to the reference position, making the scratch on the bulk by means of the indenter while recording the applied force and at least one measurement parameter, as a function of the displacement of the indenter on the bulk relatively to the reference position, acquiring and recording the images of the whole of the significant portion of the scratch, the position on the scratch corresponding to the recorded images, being determined relatively to the reference position, synchronization of the recorded images, of the applied force and the measurement parameter, as a function of the displacement of the indenter, displaying the curves of the applied force and of the measurement parameter as a function of the displacement of the

Abstract: A cassette for a strip such as a tape or film, having a pair of spools between which the strip is wound and unwound, is provided with apparatus for counting and limiting the number of times the cassette is played. A feeler assembly is mounted for swinging movement on the cassette cover, between the rolls of strip on the spools, and has two feelers one of which rides on the outer periphery of one roll and the other of which rides on the outer periphery of the other roll. Upon winding and rewinding of the strip, therefore, the feeler assembly oscillates, and in doing so, it actuates an escapement which turns a toothed wheel. The toothed wheel, turning one unit of angular movement with each play of the cassette, records the number of plays by the rotated position of the wheel, which can be read through a window of the cassette, in the form of numerals on the wheel.