| 摘要 |
<p>A method wherein a support (4) has twin channels (1, 2) with truncated vertical holes moulded in the upper portions thereof, said holes being slanted in one direction (5, 6) and in the opposite direction (7, 8). Supplying air to the channels (1, 2) enables a flat-bottomed traveller (3) to hover and move to or fro by creating a pressure differential in said channels (1, 2).</p> |
