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Show The Age of Miracles Returned to Salt Lake The' age of miracles returned to Salt Lake City. Thursday, May 15. A large crowd sat spell-bound and a'uioil unbelie"ing in the Auditor-iun. Auditor-iun. o; the West High School -;s they saw and heard Sorgtus Grace. a;'..sthnt vice president of tin Bel? T. k phone Laboratories, Inc. cf New York, give a demonstration of mr.-elous discoveries in sound transmission at a public meeting spponsored by the Utah Section ol the American Institute of Electrical Engineers. If Mr. Grace had given such an exhibition a few hundred yeais ago, he probably would have been burned burn-ed at the stake for witchcraft. Mr. Grace came to Salt Lake City through the courtesy of President F. H. Reid of the Mountain States Telephone and Telegraph Company. The crowd of interested spectat-.'s spectat-.'s saw the artificial larnyx with which the voiceless can now speak, and they heard it used. They hoard the music of an or-'hmtra or-'hmtra "filtered" with only certain cer-tain tones being reproduced. They "heard" a picture pass over ov-er a wire to be assembled at the .eyotvta! end. 1 They heard the palpitations of ;he heart of one of the audience magnified. They heard how the noise of the movement of a muscle would ;ound were the human ear sensitive: sensi-tive: enough to detect it. They heard jazzy mus:c inverted. T'aey listened to speech inverted and then transposed to its understandable under-standable form. They heard speech scrambled into an unintelligible mass and then ' reassembled. They heard a . voice at one end of a siiort telcpnone line and waited several seconds to near :c reproduced. repro-duced. And finally they saw a demonstration demon-stration in which music from a cabinet, which could not be heard by the audience or the subject of the test, passed through one man's body and into the subjects brain direct. To prove that he heard the music, mus-ic, the subject of the experiment beat time with his hands. As Mr. Grace was demonsetrat-ing demonsetrat-ing the device there was a roar Mirough the room like a speeding train, the sounds tremendously .mplified coming from the contraction con-traction in Mr. Grace's jaw as he bit his teeth together. They came through a microphone which picked pick-ed up the "noise" produced by the contraction of the muscles. Mr. Grace explained that this phenonmen had recently been discovered dis-covered in the Laboratories and explained that it was attributable to the fact that ear-drum and surrounding sur-rounding tissues are made to act as one plate cf ths condenser receiver, receiv-er, the resulting vibrations of the ar-drum being , interpreted by the brain as speech, music, or whatever what-ever sounds were impresesed upon the original transmitter. Mr.. Grace -aid that ' the sounds could be ransmitted simultaneously to al V art three persons holding hands. "It will not be long before you will go to a doctor when you have icart trouble and he will place m special stethoscope against your chest, and listen," Grace said in connection with the reproduction if hea:t beats. "The doctor will hen get out a record of heart beats which he thinks is most like the sound of yours. As soon as ho finds 'the one which correspondds w-11 diagnose just what Is the rouble with your heart by comparing com-paring it with the records made by a famous heart specialist." The artificial larnyx was demonstrated demon-strated with the aid of bellows The bellows, Mr. Grace said, would take the place of the wind which would come from the lungs of the dumb perscn The words were formed by the lips and the tongue and the ah- reproduced the sound ,v;.h the use of the artificial voice which much resembles former Vice president Dawes' . famous pipe. 'You carry this voice around in your pocket," Mr. Grace said. He told of one man of Virginia, who after losing his voice, secured one of the artificial larnyxes and returned to his work as a salesman. With the use of artificial larnyx a person can speak across the continent con-tinent by telephone. For those whose vocal cords are paralyzed a "synthetic" lung has been develop-3d. develop-3d. Another interesting phenomenon was the latest thing in burglar alarms for safes. Merely by dropping drop-ping a penny on a steel surface, limllar to that of a vault, a sound was set off like a burglar alarm. . Mr. Grace's demonstration of delayed de-layed speech was particularly interesting. inter-esting. Speaking into a transmitter transmit-ter ho was able to delay delivery of ;poech to the loud speaker for four and one-half seconds, and also to-cause to-cause at will electrical echoes so that the words were repeated one, iwo or three times. This delayed speech has a practical application n transatlantic transmission, preventing pre-venting howling. One of the most amusing parts jf the evening for the crowd was vhen Mr. Grace scrambled speech ulectrictlly, inverting it so that high notes were low and low notes men. ine speecn was tnen unintelligible. unin-telligible. But he showed that an electrical brain, as he called it, jould unscramble the sounds and translate them into English. In this scrambdled gibberish the words "playefeen krinkenope" spoken into the telephone were unscrambled and came out of the loud speakei as "telephone company." Mr. Grace explained that this scrambling of words made it possible pos-sible to send messages by radio 7,'hich are unintelligible to anyone except the listener at the station which has receiving apparatus to unscramble the message. While the Laboratories employs 3,500 persons and has an annual budget of $19,000,000,-the dlscov-iT.-ies that have been made have saved the telephone company and 'he public hundreds of millions of dollars, he said. He explained how the loading xil and the telephone repeater made long distance calls possible without the necessity of heavy copper wire which would make :a!ls almost prohibitive in cost both to company and to the user. Now long distance calls are made over wires no larger than the ordinary pin, he said. . . Mr. Grace pointed out that the development of "permlvar" together togeth-er with a new insulating material known as "para gutta," both products prod-ucts of the Laboratories, make possible pos-sible the construction of a tele-i-Jioni cable across the Atlantic to supplement the radio systems now in use. Construction of the cable is expected to ' start within the next year. |