Illustrative didactic device. (Machine-translation by Google Translate, not legally binding)

摘要

Didactic illustrative device, characterized essentially by the fact of consisting of a base plate with a central core and on which a decorated background is applied on top of which at least one transparent sheet is superimposed on said surface with suitable graphics and it is threaded, on the sheet of which there is placed a front plate provided with at least one window that allows the view of the different compositions that can be made by the independent turning of the pieces and the consequent change of relative position of their graphics, for which the intermediate sheets have radiating radial fins for their action. (Machine-translation by Google Translate, not legally binding)