onsisting of a disk of tin having notched edges and provided with two holes on diametrically opposite sides of the center, and furnished with an endless cord passing through the holes. The disk is rotated by pulling in opposite directions on the twisted endless cord, allowing the disk to twist the… … found to be just twice as long as the closed pipe. If, THE BUZZ If, while the disk is revolving rapidly, its periphery is brought into light contact with the edge of a piece pf paper, the successive taps of the teeth of the disk upon the paper produce a shrill musical sound, which varies in pitch…
