| 摘要 |
<p>Apparatus for restricting magnetic oil to a desired location within a FFFB (12 and 14) comprising selectably locatable stopper apparatus (30) having a first location (Fig. 2B) near the FFFB enabling a vacuum to be produced and for restricting the magnetic oil within the FFFB during filling of the FFFB with the magnetic oil and a second location (Fig. 2A) away from the FFFB when filling is not occurring and apparatus (34, 36) for moving the selectably locatable stopper apparatus between the first location and the second location.</p> |
