| 摘要 |
<p>The sanding or painting mechanism, consists of an arm connected to a hydraulic cylinder, and able to travel up and down the hull. Sanding is effected by means of a reciprocating variable speed cylinder operating inside a caisson, which is opened at the top and closed by the hull. Painting is effected with the caisson clear of water displaced with compressed air. The top end of the caisson is sealed with rubber strips to keep out the water in case of air pressure failure. The caisson may be supported on rails and suspended from cables.</p> |
