the polyphon

An old, wonderful mechanical musical instrument, the polyphon, makes an amazing sound when a metallic disc with punched holes is moving over little gearwheels, that pull at small metallic tongues. Anke Mellin, the owner of that musical instrument, asked me to make it work again.

The reanimated polyphon

Looking at the old metallic discs, I decided to create a  pi - disc, on which the holes are punched in direct correspondence to the digits of pi. I began to punch the first 31 holes with a coordinate system x-y in the center of the disc. One hole (tone) is defined by 4 digits, two digits for the radius and the next two digits for the angle, counted from 0 degree. When all 31 holes are done, the next group of 31 holes counts from the maximum angle of the first group. This way I calculated the first 1464 digits of pi to get a polyphon - pi - disc you can see below.

"starry sky" of the metallic pi - disc

Now that the disc is designed, I have to find a very good craftsman to make it real. For all, who cannot wait until the disc is done:
>>>>>> You have  the opportunity to hear the digital sound of the polyphone - pi - disc! <<<<<<<<
I created this sound using the amazing GRAPHIC COMPOSER by Jürgen Lange.


You can hear the sound of the first 
1464 digits, played on virtual polyphon (3 KB):