Acknowledgements

We would like to thank the following people who have provided us with this information and enabled us to produce an exceptional web page.

How Things Work. David Macaulay. Houghton Mifflin Company: Boston, 1988.

The Encyclopedia Britannica.Volume 2, Encyclopedia Britannica Inc:Chicago, 1998.

http://www.tinfoil.com

http://www.phonorec.com

http://www.acusd.edu/history/recording/notes.html

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