Movies made sound with a light bulb: Sound-on-film
Just like the movies in a theater!
Links 'n' stuff:
The Engineer Guy did a fantastic explainer on the mechanism of film projectors - much deeper than I went as I was focused mainly on sound. Check it out if you want to learn more!
https://youtu.be/En__V0oEJsU
Technology Connextras (my second channel where stuff goes sometimes)
https://www.youtube.com/@TechnologyConnextras
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