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Water Treatment By Electricity Or Magnetism
(AREA)
Abstract
Una nueva brújula, caracterizada por constar de una esfera transparente, con un relieve en forma de flecha y medios adecuados de sujeción, dentro de la cual hay una segunda esfera sumergida en el seno de un fluido de igual densidad que esta esfera, en cuyo interior tiene un imán que la orienta y lastra de modo que conserva su posición, teniendo grabadas, en su círculo máximo horizontal, las notaciones principales de la rosa de los vientos.