The old " two cans and a string " technique (or better yet, " two paper cups and a string ") really does work. The key is to make sure that the string is tight between.
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2 Tin Cans And A String started in 2001 as Comkraft Telecom. Our services include business telephones, surveillance, voice & data cabling and fiber optics.
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Don't miss our latest news, features and videos. Create a book Download as PDF Printable version. Nothing works if the. Don't miss out on WIRED's latest videos. Sound waves are created as the air vibrates in response to a person's speech or other sounds. Your California privacy rights. Share your string telephone observations and results! Staying informed has never been more important. The vibrations travel through the string by pulling the string back and forth. More From The Stuff Network. Therefore, the bottom of the second cup should start to vibrate back and forth just like the bottom of the first cup is vibrating, producing sound waves. All of us at WIRED appreciate your support!