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Desc:Filmed at 24fps.
Category:Science & Technology
Tags:water, hose, i learned something, sine wave
Submitted:Triggerbaby
Date:03/13/13
Views:1520
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Comment count is 12
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?
Ursa_minor - 2013-03-13
Yeah.

Triggerbaby - 2013-03-13
Not a fake- the camera films at 24fps.

kingofthenothing - 2013-03-13
It's not the water so much as the tube itself being shaken.

Old_Zircon - 2013-03-13
I don't think the specific frame rate is as important as the fact that the sine wave is at the exact same frequency (24Hz in this case). I might be wrong about that but I don't see why the specific frequency would be too critical as long as it was low enough.

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.

Old_Zircon - 2013-03-13
And the light reflecting from the water combines with the lens to form the CRT.

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.

MrBuddy - 2013-03-14
I've seen something very much like this done with a strobe light, there wasn't a corkscrew effect.

MongoMcMichael - 2013-03-13
Surprising lack of dubstep.
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.
The God of Biscuits - 2013-03-14
The 23/25 Hz demonstration is a perfect example of signal aliasing.
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