This machine manipulates small spherical rare earth magnets, slicing one at a time from the end of a long chain, moving it around a bit, then dropping it back to re-connect at the tail end of the chain.
It also demonstrates a little snippet of science called eddy currents. Watch how slowly the magnet falls through the aluminum tube compared to falling through air: the falling magnet generates an electrical current in the tube, and that current in turn generates a magnetic field that opposes the movement of the magnet, slowing it down dramatically. [more in description]
“History in Audio Recording: The only working pallophone in the world(2010), plays back the earliest radio station recordings ever made. It used light bouncing off a tiny mirror to expose a strip of film. A photoelectric cell is used to read the recordings. The film recorded waveforms of sound as tiny black stripes. Demonstration on…” more
Complete instructions for building this device