New Britain herald., 1922-11-18
MYSTERY OF THE ARTIFICIAL
 HUSH EXPLAINED BY WIZARD

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 were to put his hand in front of him as though pressing the palm against something and then push outward, he would create sound, but it would not he audible because the vibrations would not be quick enough to catch the vibrations of the ear,
 Sounds We Never Hear
 There are sounds in the air about us all the time we never hear, he ex- plained. The whip lash used as an illustration. The whip is moved. not too rapidly. and swishing sound Is heard. It Is snapped rapidly and 1t gets velocity in excess Of the velocity of sound, thus causing a compression on the air, which by vibrations on the car drum becomes audible, and which constitutes the sharp crack
 In siencng noise, he said the problem was to distribute it over q great period of time. This is the principle of the Maxim silencer. Sound goes mile in five seconds. Pictures of sound are taken by the light Of electric sparks in an electric condenser. travelling at about one mil- lion sparks second.
 Photographs of Sound
 The speaker showed a number Of interesting photographs of sound waves, explaining how they travel on flat and round surfaces, smooth and broken surfaces. He explained how, while light throws a shadow sound waves come together after passing an 1 obstruction although Nightly weaker in the spot hAck of the obstruction
 He explained how sound waves are broken up and slowed up while going through muffier and also showed an interesting picture of the sound of cx- ploding Fourth of July bomb
 A series of photographs of sound waves and interferences after the fir ing of guns and small fire arms as shown as well as photographs shown of 12 inch guns with the maxim sil- encer eliminating the explosion sound, Contrary. to the popular feeling, 1t is impossible to use Maxim silencer on an ordinary revolver, he said, be- cause there is au opening between the barrel and cylinder for the gas to es- cape and if the exploding gas does not escape through the barrel it will come out between the two pieces ' Going through the Maxim silencer the gas containing .the sound waves goes through a vortex of whirling motion and is thrown by centrifugal force 1 against the sides of the baller. The Maxim silencer so guides this gas through f1anges and small holes that | 1t breaks the sound waves into GA small parts, practically eliminating them.
 The little whirlpool of water run ming out of bathtub, furnished the inspiration to the inventor after two years of hard study figuring his prob | lem. he says.
 The need of general silencer, ac- cording to Mir Maxim, is almost as ] great today as the need of n telephone
 Camera Tells How It's Done
 Following his address he was asked question after question on sound waves and silencer. He showed pic lures of silencers taking the noise out of exhausts in gas and oil engines air compressors, safety valves, etc. H' l explained the theory whereby per ] son can. by striking a certain note, Q { music, shatter all the glassware Tn room, or vioIinist can, in the same manner, cause bridge or building to collapse, by striking a certain note l Certain kinds of notes can burst per. sons ear drums or render them tenn porarily deaf, he added.
 | He explained how itlis possible te send and receive four telegraph and two radio messa ges over single wire at the same time. He told how two men playing flutes or singing, Tn the same key and the same notes, mign' make different sounds. How one kind ! of wood makes better violin music ] than another. How a dog lives in the 1 world of odor and bat lives in a world of sound. What .Atls the Dog
 l One question which elicited much amusement was asked the expert on sounds. He was told of town where there is a set of church bells which have peculiar but not un- pleasant sound to the human ear, but every time they ring every dog In the neighhorhood squats down in his tracks and howls.
 "The dogs hear a different sound {; than the human ear does" he said ''The ball does not sound the same to them as 1t does to you. It has a doleful sound to the dogs. It does not give them physical pain but it wrings their very being with anguish. If you could see the expression on their faces you would see that they are almost heart broken.
 ! Would Silence Women Also. I Women and babies are included In the things needing silencing, accord | ing to letters for help being received at the Maxim plant, the speaker said. ' The list of noise makers which the Maxim company is asked to silence, according to the inventor includes the following: Steam safety valves, air safety valves, oil cloth curing ma | chinery, four bag making machinery, aspirin making machinery, kodak | film making machinery, automatic air hoists, pants pressing machinery millimen in the early morning, wives, mothers-in-l Jaws and babies.