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Priority to ES0059828UpriorityCriticalpatent/ES59828Y/en
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Publication of ES59828YpublicationCriticalpatent/ES59828Y/en
Adjustable filtering protective glasses, which are essentially characterized by the fact that they present the fixed transparent parts of a certain color, polarizing structure and with their axes in a certain sense, being superimposed on the aforementioned parts other rotating, also transparent, colored , also polarizing, which are duly guided on the first and are susceptible to be moved with respect to these in order to vary the position of the opposite axes and, therefore, reduce and extend the passage of the light rays, which provides a progressive filtration that ranges from a maximum of luminosity when such axes are found in coincidence to a minimum of clarity when the latter are at right angles. (Machine-translation by Google Translate, not legally binding)
An optical apparatus for the recognition and study of parts of translucent and transparent materials (Machine-translation by Google Translate, not legally binding)