Cast frequency........................................................................
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A constant inaudible frequency is played through a horizontally mounted speaker.......
Onto this speaker is placed a Petri dish filled with casting resin; the resin sets....
revealing a waveform on its surface – leaving a trace of the frequency................
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Image 1) 10Hz.........................................................................
Image 2) 20Hz.........................................................................
Image 3) 30Hz.........................................................................
Image 4) 40Hz.........................................................................
Image 5) 40Hz, illuminated with laser light...........................................
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