| 摘要 |
<p>The invention relates to an apparatus meant for detection of natural food. According to the invention, the apparatus comprises a disc (5) provided with a central through hole and a stand consisting of a rectangular plate (1) on which a rod (2) curved at its top is mounted, a thread (3) being fixed to the top end of the rod (2) to support the disc (5) while allowing it to describe an oscillatory motion as a consequence of a manual impulse imparted by an operator.</p> |
