Brief description of the tread pattern stereophotographique

摘要

P & this process is of the type in which it is photograhy a model on which is projected images on screens rayes vertically / p & & p & according to the invention, in the phase of shaping is sprayed onto the block of material to model, not the images of the simple photographs of the model, but the image of a negative by means of a headlight and the image of a positive by means of an additional headlight, the projections of the negative and positive to overlap exactly on the block accurately modelled, giving a zone uniformly gray, while a shaping incorrect would appear that are too light or too dark fringes on the edges of the lines. / p