<div class='quotetop'>QUOTE(admin @ May 21 2006, 03:15 PM) Quoted post</div><div class='quotemain'>
2 empty tins, and 12,000 miles of string should work very cheaply for calls [img]style_emoticons/<#EMO_DIR#>/rolleyes.gif[/img]
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I did try googling for "speed of sound on a string" but didn't get very far...
personally I find chikka.com to be the most useful since we don't both need to be sat at a PC.
