The Telephograph

A New York Inventor Said to be Able to Make Piano Wire Talk.

Special Dispatch to Democrat and Chronicle.

New York, April 13. — Many wonders in electricity have hien demonstrated at the conversazoine of the American Institute of Electrical Engineers in Columbia College. Thomas A. Edison and Nikola Tesla were among the inventors present. Professor Wilbor Moulsen's telegraph exhibited in one corner of the building. The exhibition attracted the enthusiastic attention of all present and none was louder in praise than Mr. Edison, who gave great credit to the inventor for his work.

Professor Poulsen has succeeded in packing into an electrically charged piano wire a conversation that may be drawn out much as one draws wine from a cask. The apparatus consists of a brass drum, 11 by 5 inches, upon which is wound piano wire. Resting upon the wire is a tiny electro magnet, which is connected to a Carlson telephone transmitter, two cells of battery and preferably an induction cois. When the transmitter is spoken intn, it acts as a trap on the battery, causing currents of varying strength, in proportion to the strength of the sound waves, to pass through the electro-magnet. The current causes the maguet transversely to magnetize the steel wire as the drum revolves and the magnetic lines of force are permanently recorded therein.

After the steel spiral is filled. which operation takes abom thirty-nine seconds aud permits the recording of 100 to 120 words, the tiny magnet is placed in its original position and connected with a receiving telephone. The cylinder is again recolved. and as the magnetized steel wire passed before the poles of the electro-magnet, it forms a species of magneto-electric generator, giving out currents of electricity of a strength and direction corresponding to the megnetization of the steel wire, which correspondingly affect a telephone held to the ear and reproduo the sounds and words originally spoken with absolute fidelity.