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 General Editors:, M.A., F.R.S. and , M.A., F.R.S.

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A Treatise on the Theory of Alternating Currents. By, M.A., M.I.E.E.

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Radio-activity. By, D.Sc., F.R.S., F.R.S.C., Macdonald Professor of Physics, McGill University, Montreal. Demy 8vo. pp. x + 400. 10s. 6d. Net.

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