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Originally Posted by Andrew Blair
Supposedly, the box was engineered so as to create a gentle harmonic sound when ran, as versus the typical grindy noises.
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The sounds made by the two gear meshes in the box are supposed to be two octaves apart. Since two octaves would mean that the higher frequency is four times the lower one, I'm guessing all that means is that the medium-sized gear in the left side of the picture has four times as many teeth as the small gear beneath it, on the same shaft.
It's not really that big a deal engineering-wise, but the attention to detail is nice.