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CAUSE OF THE EARTH'S MAGNETISM.

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CAUSE OF THE EARTH'S MAGNETISM. The mystery of the earth's magnetism it- a ] i. blcui that has baffled the wisest scientists < fill limes and country. No even approximate < xplanation of this great force of i.ature has « er been offered until within the past month it- was announced that Dr. Henry A. Rowland, Professor of Physics in the Johns Hopkins University, Baltimore, had devised a machine that would afford opportunities for experimenting into the causes of magnetic force. Professor Rowland's theory is that a body moving rapidiy tlircugh the air will generate within itself a strong electrical current. If this idea can be proven, then tho swift flight of the earth through space will ex- piain its electrical influences. The machine which Professor Rowland has invented to test his theories is a wheel, wound with fine wire, revolving about a shaft, inside a casing, which allows space for a layer of air about the wheel. The wheel represents the earth, and the layer of air the atmosphere. In the preliminary ex- periments it is already proven that the revolu- lion of the wheel develops magnetism in the wire, more or less, according to the swiftness of the revolutions. An endless variety of delicate experiments will be made with this machine by Professor Rowland and his assistants, with a view of securing the definite solution of the earth's secret of magnetic force.

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I The Cycling World.