| 摘要 |
<p>The instrument incorporates a pivot joint, allowing the top support to be maintained in a vertical position whatever the angle at which the lower one is inclined. In the centre of the top support (1) there can be a tube acting as a guide for the tip of the phial etc. from which the liquid is poured. This tube can likewise be maintained in a vertical position, whatever the position of the bottom support. (2) and the angle at which the user's head is inclined.</p> |
