| 摘要 |
<p>A small segment (5) moves along the smallest diameter guided by guiding elements (2) mounted on one of the greatest circles parallel to spherical shell (6). A medium segment (4) moving along the medium diameter on the another circle, and large segment (3) of other circle, are moved on one hand by arched gear rack (10). The gears (9) on the axle (8) are connected to turning knob, so the segments (3,4,5) provided with distinctive mark are connected to one another with identical marks by movement or by rotation.</p> |
