Show UV I SOUNDS INAUDIBLE TO EARS Di Lee L e De Ds Forest In Inventor ot of the audion audien detector amplifier an and a pioneer In the development of 55 telegraphy in Amerl America re- re recently recently re recently announced his new Insen- Insen In Invention en- en tion the which h Is h capable of ot rc- rc recording and trans trans- transmitting transmitting trans sounds sound so and ot of such cb a high Ih number of ot that they al ar ama e Inaudible to the th hu- hu human human hu human man ear car The Th announcement of the new Instrument wa was made In con con- connection con connection with Ith Dr De Dc Forests Forest s corn com com comment ment on the microphone perfect d dby dby by Dr Phillips Thomas The Th new nw In instrument will be ot of o In- In Interest Interest terest to both the scientist and the general public In that lL It it Is 19 capable of recording sounds map map- Inaudible dible to the th human ear car and of ot ant om- and with un- un unprecedented el ss the th sounds of musical Instrument s or ot of o the hu- hu buI human human man voice olce At a demonstration of oth the at nt the Do De D Forest I In laboratory In East rat Forty Forty eighth at a distance tom horn th tha tho Instrument street the notes nots of at a piano truck struck of fifteen feet were ve st Ito tn absolute ac and d volume to 10 a 0 rec v hl r opo tusIn In the th next nett room Toom Ise the th voice vole of ot a a man starting ten feet tee from the e and speak speak- speaking In ing In a K subdued ne It-ne was trans trans- transmitted with Increased Increase volume The thermo phon w was wis perfected to 10 a great treat bv by T P W VT Case Cae at athis athis his research laboratory ry at Auburn N Y V although the original Idea 5 as Dr De Dc forest lorest m h It utilizes utilize a sma small platinum wire one one eighth ot of an Inch long lone and on one ten of an Inch In d met r which Is heated red hot bot bv by an el current of very low s vol Ie taff Sound staves aves by ooin m this sire Ire alter alter- alternately alternately reduce and Increase It its re- re resistance resistance to the electric stream malting making a a perfect telephonic cur cur- current current cur rent |