Figure 29. Gilson sounder, described in 1906 by Gustave Gilson of the
University of Louvain. He described a perfected scoop sounder which was similar
to the Stellwagen sounder but contained a number of improvements for assuring a
larger quantity of sediment obtained than with the earlier instrument. It was
first tested in 1899 near Ostende off the coast of Belgium.
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