Un trait innovant explorant les relations entre l' lectricit et le magn tisme et leur r le dans les ph nom nes naturels, crit par un pionnier dans le domaine. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy...