The Montgomery advertiser., 1902-03-04
4 WIRELESS TELEPHONE
KANSAS CITY MAN n THE IN
 MENTOR.
Albert Jahuks Exhibited It Before the Inventors, Association--Hs
 Says Whole City Gould
 Use His System.

Albert Jahnke. a young German capi- net maker, who lives at Twenty-thirn street and Woodland Avenue, Is the in- ventor of q successful wireless telephone. He. gave a demonstration of 1t before the National Inventors Association at 7zo Delaware Street last night. His appa- ratus is still somewhat crude. but he believes he will be able to develop 2 system of teiephoning without wires so perfect that men can carry their phones about In their pockets. ana connect tnem- selves with central and each other at their own pleasure.
 There is the same difference between the results obtained by the systems of Jahnke and Marconi that there 10 De- tween. ,teiephoning with wires ana teie- graphing with wires. Marconi transmits oniy the teiegraphic code Of dcts ana dashes. while Jahnke transmits the human voice. As yet he has net been able to send the sound waves through the air e greater distance than ten feet. but he says that only time, patience and a better apparatus are required to adapt his system to the needs of the largest city or for that matter. the whole earth.
 The apparatus Jahnke used last night was divided into two parts. one con- sisted of four batteries. which were con- nected by wire with an ordinary teie- phone transmitter and thick coil of in- sulated wire. The other consisted Of . wooden box, about the size and shape or . tambourine, containing metals Of dif- ferent kinds, to which was attached long wire, at the end of waich was a telephone receiver The coll of wire and the box containing the metal were toned" to each other. or nearer. In any relative position, a whistle or word in the trAnsmitter could be distinctly heard by any person who had the receiver to hls ear.
 It was objected. during the experiment. that the person had the receiver to his ear when he stood in the same room as the person who was speaking. really did not hear over the wire. but in the ordinary way. The wire connected with the box was then extended so as to reaeh outside the room into a part of the building where 1t was impossible that the sound of the voice of a person speaking could penetrate. The experiment then made was as successful as the others. The voice could be heard as plainly as over an ordinary telephone. when the box and coil of wire were close together. When they were moved eight or ten feet apart the sound was much Nike that made in the ear through the rubber tube of a photograph.
 Jahnke to snow the perIectioH Ol HIS invention, held various objects between the coil of wire and the box containing the metal, among other things being a chair with a very thick bottom. Their interpretation had no perceptible effect.
 The inventor is very optimistic regard ing the possibilities of his contrivance.
 Zone central. with big dynamo and spark coil, will be able to furnish serv- ice for an entire city," he said. "and the telephone will be simplihed and its ex- pcn.iveness greatly reduced. You will be able to carry your telephone in your pocket or have 1t on your parlor table. It will be much smaller than the present phone It will consist of a small box cnrts Line metals and the receiver, with a very short wire connecting them. When 1t has been toned you will be able to get central at any time.
 By this system you can takes mes. sages of telephone wire any place" Jahnke continued. T haven't tried it., but believe by little work I, could get so I could tap any telephone wire.p
 Regarding the difference between his invention and Marconfs. Jahnke said:
 "In place of a box containing metals, Marconi has what is oslled '""1-'''-'-' tube, This tube is of glass and is about two inches long and an eighth of an inch In diameter. It contains two silver blocks, one at each end, which come within about one-sixteenth of an inch of each other. About half the space between these blocks Is filled with metal filings strument by wires. Whenever there Is a discharge of electricity from a coil which Is toned to it, spark passed between the two silver blocks and this sends a current from the tube down the wire to the telegraph inatxument. which