| 摘要 |
The instrument has two walls (1) facing each other in the form of a pliable, doubly folded plate, the walls being joined to one another at one of the wall counter posed outer parts (2). The other counter posed outer part comprises the doubly folded plate ends which can be fixed or loosely connected to one another. The walls between the outer parts bend outwards from each other in pliable parts (5,7) and on the middle part of the one wall inner side is a striker part (4) which extends outwards from the wall side towards the opposite wall inner side. The walls can be completely flattened when the striker part is not fitted. The walls outward bending from one another increases of the two outer parts (2,3) are pushed towards the striker instrument centre. |
