SE DESCRIBE UN APARATO DE DEMOSTRACIÓN DEL EFECTO FARADAY PARA UN LABORATORIO DE LICENCIATURA. LAS PRINCIPALES CARACTERÍSTICAS DEL INSTRUMENTO SON: EL USO DE DIODOS EMISORES DE LUZ COMO FUENTE MONOCROMÁTICA, EL EMPLEO DE UN SISTEMA DE AGUA DE ENFRIAMIENTO PARA MANTENER LA MUESTRA Y LA BOBINA DE CAMPO MAGNÉTICO A TEMPERATURA CONSTANTE Y EL USO DE LA TÉCNICA DE MEDIA SOMBRA PARA MEDICIONES DE ROTACIÓN ANGULAR. EL APARATO PUEDE SER CONSTRUIDO CON PIEZAS DE DESECHO.AbstractA FARADAY ROTATION DEMONSTRATION APPARATUS FOR AN UNDERGRADUATE LABORATORY IS DESCRIBED. THE MAIN FEATURES OF THE INSTRUMENT ARE: THE USE OF LIGHT EMITTING DIODES AS THE MONOCHROMATIC SOURCE, THE EMPLOYMENT OF A COOLING WATER SYSTEM TO KEEP THE SAMPLE AND THE MAGNETIC FIELD COIL AT A CONSTANT TEMPERATURE, AND THE USE OF THE HALF SHADOW EFFECT FOR ANGULAR ROTATION MEASUREMENTS. THE APPARATUS CAN BE BUILT FROM SCRAPS.A FARADAY ROTATION DEMONSTRATION APPARATUS FOR AN UNDERGRADUATE LABORATORY IS DESCRIBED. THE MAIN FEATURES OF THE INSTRUMENT ARE: THE USE OF LIGHT EMITTING DIODES AS THE MONOCHROMATIC SOURCE, THE EMPLOYMENT OF A COOLING WATER SYSTEM TO KEEP THE SAMPLE AND THE MAGNETIC FIELD COIL AT A CONSTANT TEMPERATURE, AND THE USE OF THE HALF SHADOW EFFECT FOR ANGULAR ROTATION MEASUREMENTS. THE APPARATUS CAN BE BUILT FROM SCRAPS.