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Un calidoscopio perfeccionado, caracterizado esencialmente por el hecho de comprender dos espejos rectangulares unidos por sus cantos mayores, formando ángulo agudo, y dispuestos en el interior de un tubo de mayor longitud que la de los espejos, estando cerrado dicho tubo por un extremo, mediante una placa opaca en la que existe un orificio ocular, mientras que por el extremo opuesto está cerrado por una lente.