Explore "David Goes Voyaging" by David Binney Putnam on Textopian. Read with annotations and highlights.
The Blake dredge has a ten-foot iron bar across the top, a handle arrangement and a long twenty-foot net at the bottom, in which things are thrown after being loosened by the top bar. The bottom of the net is fastened so that specimens cannot be dropped out.
This is put way down till it is on the ocean bottom, and then trawled along slowly for an hour or more. Sometimes the whole dredge is lost when it hits an unexpected mountain peak or rock or ledge at the bottom, as it was at Abingdon Island, and once the whole thing was terribly twisted and bent out of shape because of hitting something way down in the depths.