Figure 22. The Thor ring-trawl net used in deep water. Devised by Johannes
Schmidt in 1905 and used for carrying out studies on board the THOR. This net
was used to capture fish in very deep water. It was first tested in waters
between 1040 and 1090 meters depth off SW Ireland. The ring was originally made
in one piece but George Hansen designed it in two to allow it to fold up.