| 摘要 |
<p>It is formed as of a rectangular cardboard sheet upon which there are parallel slotted lines (1) which determine, in the folding, the formation of a regular octagonal prism with the bases open. Parellel to the edges of the bases slots (6) and (7) have been made forming two strips divided by slots (1), in whose divisions there are diagonal slots (8) that divide up the strips in triangular areas, whose folding towards the inside of the prism determines the narrowing and partial closing of the bases of the prism forming a diaphragm. <IMAGE></p> |
