摘要 |
<p>The set has identical devices revealing and concealing white part (3), green part (4), black part and red part by rings (14, 18), where parts have different weights. The rings are fixed on a slope plate (13) by tilting around a rod (10). The parts are fixed at an end of the rod and swing around green and red balls (7, 8) placed at a queue on a plate (25). The plate (25) is placed over the plate (13), and the balls are placed on two slides fixed at side panels. The green and red parts are retained in the ring in visible position by a magnet (21), and the white and black parts are retracted.</p> |