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Show WORKING OUT SOU N D MAGIC. M. Dosne has Invented n method for recording radio-telegrams He first Substitutes for the telephont receiver ! of wireless telegraphy a sound simplifies simp-lifies and then connects this with the I "receiver of a Poulsen telegraphone I In this manner the microphonic current, cur-rent, serving to convey the re-enforced sounds. arriveSi with all Its variations, j to a bobbin of fine wire In the center ! of which is a pen of soft Iron in J contract with a rotating plate or ; traveling band of sUel. The variations in the maguetiza- i tion of the soft Iron pen leave a sort magnetic writing on Ube steel plate, .which has the property, when it Is afterward passed under the iron pen ! which wrote it, of provoking a re- , petition of the original signals in the connected telephones. |