| 摘要 |
A working element for broadcasting running materials comprises a rotating disk with groups of blades of a varying length, fixed thereon, which are arranged symmetrically as regards to the vertical axis. In doing so the working surface of the disk is made as that concave of a spherical shape, the external edge of the disk has screw-shape cuts in the area of each of the groups of the blades, and the blades are curvilinear as a circular arc tangent to the radius of the disk. |
