| 摘要 |
<p>A collection apparatus (2) comprises a) an air outlet (8) b) a collection mouth (30) and c) means (10) for creating an airstream for discharge at the air outlet (8). The apparatus further comprises d) a cylinder (18) mounted at the air outlet (8) for rotation and e) means (20) for directing the discharged air stream substantially tangentially across the surface of the cylinder (18). <IMAGE></p> |
