SteamPoweredKleenex  - 2013-03-13
Cool.
So, is it a fake? I thought you only got water patterns like that from filming at a certain framerate. If that's the case, would the cast shadows also have the same pattern?
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Triggerbaby - 2013-03-13 Not a fake- the camera films at 24fps.
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Old_Zircon - 2013-03-13 This is basically identical to how an oscilloscope works, incidentally. the movement of the hose is the Y axis, the flow of the water is the Y axis and the shutter of the camera is the trigger.
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Old_Zircon - 2013-03-13 And the light reflecting from the water combines with the lens to form the CRT.
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Raggamuffin - 2013-03-14 It's only "fake" in that it wouldn't look like this to the naked eye. You see a clean pattern because the camera is capturing frames at the same rate that the tube is oscillating. When he toys with the frequency by a hz or two, the effect changes. Same as when you watch a car wheel or helicopter blade spin, and for a moment it looks like it's moving backwards ect.
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MrBuddy - 2013-03-14 I've seen something very much like this done with a strobe light, there wasn't a corkscrew effect.
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MongoMcMichael - 2013-03-13
Surprising lack of dubstep.
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memedumpster - 2013-03-13
Oh, the things that ran through my mind when I read the title as "A horse attached to a 24Hz sound source."
The wavelength of 24hz is 14.29 meters (at the speed of sound). This is a camera trick only and, like was pointed out, shaking the drum.
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The God of Biscuits - 2013-03-14
The 23/25 Hz demonstration is a perfect example of signal aliasing.
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