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Un dispositivo anunciador, caracterizado por que consiste en una botella provista en su interior de una bombilla que se enciende y se apaga continuamente por la acción de un conmutador movido por una espiral cónica de papel o cualquier material adecuado que rodea la botella y se coloca igual que este sobre la cafetera de los bares y cafés, de tal modo que la ascensión del calor haga girar a la espiral y esta mueva el conmutador de la luz.