THE vessel used for the annual oceanographical investigations in the Lofoten area (the Johan Hjort) had a Hughes echo sounding gear (magnetostriction system, frequency 16,000 cycles per second) installed before leaving Bergen last February. The gear worked smoothly all along the coast and besides furnishing a great number of interesting sections, revealed many features hitherto unsuspected; among others, that the clay flooring of deep fjords is invariably about 10 m. thick and generally very flat.
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SUND, O. Echo Sounding in Fishery Research. Nature 135, 953 (1935). https://doi.org/10.1038/135953a0
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