| 摘要 |
<p>A modular design is proposed. The sandbox is composed of four identical components (1) which are connected to one another via corner pieces. In an extended embodiment, a boom projecting over the centre of the sandbox is swivellably mounted on one corner piece. Arranged on the free end of the boom is a slide projector and/or a device for optical target marking. The latter has a point light source which can be adjusted from a keyboard to any coordinate point inside the sandbox by a positioning motor via process control. <IMAGE></p> |
