. L'ingénieur civil et architecte's journal, scientifiques et de la gazette. Architecture ; génie civil ; la science. 284 L'INGÉNIEUR CIVIL ET ARCHITECTE'S JOURNAL. [Août, suffisamment de surface de métal était présent pour transmettre le courant en et ou de l'eau. Avant de continuer à appliquer ce fait, cependant, le premier régiment- a été répétée, mais avec une batterie plus petite. " Un fil de cuivre a ensuite été prévue sur le gravier à pied le long de la rive nord de la rivière Serpentine, du pont qui sépare Hyde Park de Kensington Gardens, à l'est de la rivière. Sur place trois fe

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. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 284 THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. [August, sufficient surface of metal was present to convey the current into and ou of the water. Before proceeding to apply this fact, however, the first expe- riment was repeated, but with a smaller battery. " A copper wire was next laid down on the gravel walk along the north bank of the Serpentine River, from the bridge which separates Hyde Park from Kensington Gardens, to the east end of the river. About three square feet of metallic surface was attached to each end of the wire and put into the river; a galvanometer was put into the circuit at the bridge, and a small Grove's battery at the other extremity of the wire. The electric cur- rent passed by the water, and returned by the wire, and with as much power as would have been the case with an ordinary metallic circuit. Iu this arrangement the magnetic influence ceased the moment the circuit was broken, as it would have done in an entirely dry circuit. " Reflecting on the foregoing experiment, it occurred to Mr. Bain that the satural moisture of the earth might be a sufficient conductor for the electric ?urrent, and with a view to ascertain the correctness of this assumption, a â wire was led along a wood-paling extending from the river to a well about a hundred and fifty yards distant; one of the metallic surfaces attached to the â wire was put into the river, and the other into the well; the galvanometer was put into the circuit near the river, and the small battery near the well. On completing the circuit, the current passed freely, as in the former experi- ruents, showing that ichtn sufficient moisture is present, the earth is a good conductor of voltaic electricity ; and that one-half of a voltaic circuit is all that is necessary to be insulated from surrounding conducting matter. " While reflecting upon these experiments, s

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