Julius Sumner Miller Lesson 37 Miscellaneous Adventures in Sound

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A - Since oscillating systems have intimate connection with the production of SOUND we show here a very pretty thing - THE BLACKBURN PENDULUM. A rigid support has two strings fixed to it which join a third to constitute a pendulum of interesting complexion. A funnel hangs as a pendulum bob. We put salt or sand or sugar in the funnel - draw the pendulum aside from its equilibrium position - and let it go. Sand pours out and the pendulum bob executes interesting gyrations. We have here compounded harmonic motions. The result is a figure of great beauty. These figures are called Lissajous Figures. • B - A glass tube has within it a metal rod. This metal rod is damped at its midpoint. In the glass tube we lay out some cork-dust. We now stroke the metal rod with a cloth bearing resin (or rosin) and an amazing thing ensues: The cork dust takes up very unique positions in the glass tube. What happens is this - briefly: The cloth with resin on it grabs the rod and lets go - grabs the rod and lets go — again our relaxation oscillation business. The compressional wave thus generated _m the rod |umps off the end of the rod - so to speak - travels to the far end of the glass tube -which is tightly closed with a stopper - and is reflected. This reflected wave or pulse joins hands with the incident wave to give rise to a standing wave - which we see in the configurations the cork dust takes up. And what can we do with all this? Answer: Determine the velocity of sound in the metal rod. This tube is known as Kundt's Tube. • C - An array of bar magnets hanging on strings permits the showing of a • compressional wave advancing. One magnet is pulled aside at the very end of the array and let go. It approaches its neighbor and drives it away - since the plarization is aligned this way. The pulse goes down this array - and suffers reflection from the . open end. It can be observed that a change in phase accompanies this reflection. • D - We explore once again the vibrations of high-voltage cables. Dampers are fixed to these cables to reduce the amplitude of oscillation. We show dampers made in the USA - in Germany - in Sweden. • E - The BULL ROARER: A slender strip of wood or masonite is fixed to a string at one end. We swing the strip in a vertical circle. A sound is produced. The strip catches up the air and pushes it to¬gether thus giving rise to a pressure pulse. The effect depends on Bernoulli's Principle - which see in an earlier Lesson in Mechanics. • We close this series on SOUND AND WAVES by showing the CHLADNI PLATES once again for here lies extraordinary beauty and drama. It is this point of view that I urge on all who study anything for then the subject becomes FUN and ENJOYABLE and the SPIRIT is lifted up.","styleRuns":[{"startIndex":0,"length":2818,"styleRunExtensions":{"styleRunColorMapExtension":{"colorMap":[{"key":"USER_INTERFACE_THEME_DARK","value":4294967295},{"key":"USER_INTERFACE_THEME_LIGHT","value":4279440147}]}},"fontFamilyName":"Roboto"}]},"headerRuns":[{"startIndex":0,"length":2818,"headerMapping":"ATTRIBUTED_STRING_HEADER_MAPPING_UNSPECIFIED"}]}},{"itemSectionRenderer":{"contents":[{"messageRenderer":{"text":{"runs":[{"text":"Comments are turned off. 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