| 摘要 |
<p>The construction set can be used to test manipulative skills and consists of a plate (1) with a network of grooves. Some notches (2) are regularly spaced along the grooves into which a collar on each extremity of the main pieces fits. The notches are twice as wide as the collars so that the two pieces are fitted in together. The pieces can be also fitted into the spaces in the plate by a joining piece. They can be rectilinear, bent, or T-shaped etc. and secondary pieces of different shapes, can be joined to these or to the plate.</p> |
