National Telegraphic Union · New York : N.T.U. · leaf 64
vol., 12mo. 400 niustrations. London, 1866 6 25 FERGUSON, R. M.—Electricity. 1 voh, 12mo.... 1 75 BOND, R .—Handbook of the Telegraph 0 50 DU MONCEL.-(Lee Cte Th.)—Traite Theorique et Pratique de Telegraphie Electrique. 1 vol., 8vo 4 50 HICHTON E .—History of Electric Telegraph. 100 PRESCOTT, C.… … Vol. V. No. 7. New York, Saturday, October 10, 1868. Whole No. 117. [From Engineering.]CONSTANT CALVANIC BATTERIES. THE NEW PEROXIDE OF MANGANESE ELEMENT OF MONS. G.LECLANCHE. Whilst Telegraphy has arrived, step by step, at thepossession of methods and apparatus by which the in-sulation of lines…
Telegraph
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