Surface of a phonograph record (Gramophone Record).
Magnification - 100 times.
Sound track on an old Cinema film.
Magnification - 100 Times.
Micrograph of an old cinema film.
Magnification - 100 times.
Sound track on an old cinema film.
This image Source: Wikipedia
This image Source: wikimedia.org
External links
About Cinema film sound track. -Link-
unimovies.uow.edu.au
