DESCRIPTION:
A demonstration of recording on a tinfoil phonograph, as invented by Edison in 1877. The phonograph seen here is an exact replica of an all-brass exhibition machine as made by Bergmann in late 1878. This replica was built by the late Bill Ptacek. It's a massive phonograph, weighing 125 pounds.

For a more detailed public exhibition of this same machine, see http://www.youtube.com/watch?v=AGAVotR7wZ8