Abstract: An interactive graphics system for the mathematical representation of physical models, comprising at least one measuring machine bidirectionally connected to a central unit to which are connected a video screen and a keyboard and including processor means adapted to receive from the measuring machine information on at least initial identification points of the model, to control the automatic detection of information on additional points of the model by means of the same measuring machine, and to process this point information to produce the mathematical representation of the model.

Abstract: A fixture comprising a number of rearrangeable elements; a hand operated by a robot and designed to position the aforementioned rearrangeable elements on a reference table; and a number of part supporting and clamping means. The aforementioned rearrangeable elements comprise a tubular casing sliding on an air-cushioned pad; and a rod designed to slide axially inside the aforementioned tubular casing and on to the top portion of which are secured the aforementioned supporting and positioning means. (FIG. 1).

Abstract: The shoe has a flat surface which can slide with reduced friction on a guide surface, means for introduction and distribution of compressed air to generate a supporting air cushion between the said surfaces, and a plurality of permanent magnets generating a force of attraction between the shoe and the guide surface in such a way as to cause the shoe itself to stop immediately when the supply of compressed air is interrupted.