WebFeb 16, 2016 · All you do is cut two holes into the sides of two plastic drinking cups and insert a toilet paper or paper towel tube. The sound is great and your phone stays upright. Here's a tip that most... A tin can phone is a type of acoustic (non-electrical) speech-transmitting device made up of two tin cans, paper cups or similarly shaped items attached to either end of a taut string or wire. It is a particular case of mechanical telephony, where sound (i.e., vibrations in the air) is converted into vibrations along a liquid or solid medium. These vibrations are transmitted through the medium (string) and then converted back to sound.
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