How old movies stored sound as light

How old movies stored sound as light

Clip from "How a Film Projector Works" by engineerguy
Original video: https://www.youtube.com/watch?v=En__V0oEJsU&t=385s
Creator's channel: https://www.youtube.com/channel/UC2bkHVIDjXS7sgrgjFtzOXQ
License: Creative Commons Attribution (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/
Changes: trimmed to 6:25-7:23, reformatted to vertical, captions added.
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