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Show No Batteries, No Tubes in New Set Bismuth-Coated Device Is Invented by Youthful Georgian Student Macon, Ga. The future radio receiver re-ceiver may consist of coils, condensers and a small transformer-like lnstru-Cient, lnstru-Cient, the Invention of lr. Palmer H. ('ulg. youthful head of the department depart-ment of physics at Mercer university r.ere. There will be no tubes. There will be no transformers. There will be no batteries. There won't even be cur-I cur-I rent from electric light or telephone supply. Yet this tiny Irjtrument that takes j the place of all these Is said to be I more sensitive, uiore seieciiTO, more j powerful than the average five nnd j six-tube receiver of today. Pi's far from being the crystal set o! old. j The Invention has taken the faney of several large radio and electrical manufacturers to the extent that Craig bus already been offered ns high as $125,X)0 end royalties for the patent. The device. If found practicable. Is expected to revolutionize radio moie than nny other Instrument In this field. There will be no more need for tubes, transformers, hatteries or othei. current supply. P.eeelvers will be simpler and much cheaper. They will be extremely easy to operate. Amplifies Greater. Yet they'll prove much worthier than radio receivers of today. Craig points ns one proof of this contention to the fact that the modifying constant con-stant of h.'s little device Is ir.0, as compnred with only about 4, for the present combination of tubes In- radio nnd audio-amplification. Craig culls his device an "electro-magnetic "electro-magnetic amplifier," although It does I ninch more than nmpllfy. It consists I of about ten thin layers of formica, a j hnrd non-electric substance, on eacli of which molten bismuth has heeir sprayed at high pressure. Around these layers of' bismuth-coated bismuth-coated formica, several turns of wlr are wound. The plate Is connected to the wire at two points while the end, of the wire are connected to th ground nnd the antenna terminals of the radio receiver. The entire outfit Is nbout the slz of a radio transformer, four lnchej high by two Inches square. This simple as It is, says Craig, will ac' eomplish what five tube, transform- ' ers and the necessary A, B and C bat- ' terles will do on a modern set it detects signals, timed In by means of the tuning colls and condensers and it amplifies them almost four limes as greatly as the tubes used la radio and audio-frequency anipli0ca. tion. Can Use Modern Sets. No changes are required on the tube receivers of today, says the Inventor, In-ventor, to make nse of his device Adapters, embodying the Instrument will be used with every type of hookup. hook-up. It has Increased distance and selec-tlvlty selec-tlvlty In reception to an extent a yet undetermined by the laboratory model. Although tubes and batteries could be used with It, It works best without these. The sponsor of this Invention Is i youth of twenty-seven, who has Just roinpl-ted a pott-graduate coarse at the t'niverrdty of Cincinnati befr,r9 coming to Mercer. It was at Cincinnati Cincin-nati that he worked out this Instra- ment In his efforts to discover the effects ef-fects of bismuth la a weak electromagnetic electro-magnetic field. Ills discovery was that the extremely ex-tremely weak radio currents brought In by condensers nnd tuning coils from ' the air cause enough of a magnetic i field in the coil wound about his de-j de-j vice as to be rectified and amplified j to a great extent by the bismuth core within that field. What wi'l happen to this Invention Craig doesn't kco-.v. lie's still receiving receiv-ing offers that make l'.Ira dizzy. In one day he got more than V letters and nir.e telegrams bringing fabulous offers to him. |