Cinema projector 

Right?!

I had been looking for videos explaining the shutter for a while and, until finding this video, had not found anything very clear. this is So didatic....

They were actually smarter back then.

"less technology" is actually euphemistic for "more simple." that's not to say there's no complexity, but at the same time... explaining how a digital projector functions to this precision would require a much deeper and broader explanation drawn from many more fields and disciplines. depending on how deeply you care about how digital devices work in general, this might include a dip into quantum mechanics, which are very relevant even in systems that rely mostly on classical mechanics. film projectors of that era could be explained intuitively, and understood intuitively. we are in an age where real-world phenomena have counterintuitive explanations, or explanations that are so technical you need education to understand them. it has a lot more to do with the technology itself than it does any way people explained it. i almost hate to say this, but if you can't understand modern explanations, it's probably your fault. this is potentially too blunt, but it is accurate.

​@@korwl540I hear ya but I'm not sure if you we're directing that last part directly to me. If so, I didn't say that we couldn't understand modern explanations - just that they explained things better back then... This video was a high level view of how a Cinema Projector works, not technical explanations of how to build one. Never the less, I was just appreciating all the hard work that the creators of this video had to have put in to produce this film (without modern Computers, Software, Technology and ect). We tend to take videos like these for granted -- especially when all we have to do is fire up a PowerPoint with the click of a mouse.

It's 10 minutes left before it's 3 am here and I'm just curious 🧐 that's why I'm watching it

You know anybody that teaches people to run 35mm?

Well said, I would like to represent this feeling as you look to a paper or vinyl artificial flower rather than a real garden one with all its swings, feels and aroma. Although i understand that a person grown up in digital age will hardly appreciate the old school 35 mm motion picture handling in Cinemas due to mindset difference "Analog vs Digital"

sound on film is achieved by sacrificing a little portion on the side of the film frame to fit a sound track (this is also probably where the term "soundtrack" came from) early 35mm films use an optical sound method. on the projector's sound reading area, there's a light bulb (usually called the exciter bulb) that shines light into a little slit. that slit only lets a small ribbon of light to pass through into a photoreceptor/light detecting cell. the sound track is basically going to let a specific amount of light to hit the light detecting cell by blocking the ribbon of light with dark areas. the size of dark areas vary with the volume and frequency of the sound intended to be reproduced, lower volumes have more dark areas and louder volumes have less dark areas. the dark areas also vary much more minutely to produce the specific frequency intended to be reproduced. higher frequencies have the areas vary more frequently and lower frequencies are less frequent. the light that's received by the light sensitive cell is converted into electrical currents, then these currents are greatly amplified and the amplified signal is then fed into the speaker, which reproduces the sound.

The takeup reel is powered and the feed reel is unpowered, with a little bit of drag to keep mild tension on the film. Usually the upper or front spindle holds the feed reel and the lower or rear spindle holds the takeup reel. If you have a projector with both spindle arms on top, and you are facing the right side of the projector where the controls and threading path are, the left reel will be the takeup reel when going forward. If your projector can play in reverse, the feed and takeup reels will reverse roles. When you have played the whole reel of film and let the tail run out the back of the projector (or better, stopped it before the tail leader and unthreaded the projector) you take the end of the film flapping loose on the left (rear) takeup reel, and thread it counter-clockwise around the hub on the right feed reel, putting an inch or so of the film in the notch in the hub for that purpose. Then hold your fingers _lightly_ on the rim of the full reel to provide a little braking, and put the projector into rewind. Keep you hand on or near the reel until the whole reel is rewound. If the film starts getting loose between the reels, apply a little pressure to the rear reel to tighten up the film a bit. If you don't do this and let the film rewind by itself, about half way through the reel the film will get loose, then usually drop off one reel or the other, tangle in the spindle supports, and stretch and break the film. Then you will have to cut a couple of feed of damaged film out of the middle of the show and splice the ends together.

Hi Persephone!!! Περσεφόνη (Persephoni) in Greek!!! I gave the search term: persistence of vision and came up with this!!! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YeRbwhfaHfQ.html I hope it helps!!!! Thanks for your interest. Chris

It's just a normal arrow XD

Around 1936.

Actually, films run at 24 fps, while youtube videos run at an average of 30-60 fps.