| 摘要 |
This invention relates to an apparatus for facilitating working on especially horizontal underwater portions of ship hulls, pontoons and other floating objects. The novel feature resides in that the apparatus comprises a screen structure adapted to be tightly fitted along the edges of the surface on which operations are to be carried out, and projecting downwardly from the surface, the screen structure being sealed against the surface and laterally, but perforated or open downwardly, and a pipe for introducing air with a pressure adapted to the water pressure prevailing at the actual depth, into the space within the screen structure in order to provide an air volume serving as a work-space, under the surface.
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