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Sounding machine, oceanographic Sounding machine, oceanographic

One of a collection of deep sea sounding machines - Hydra type of oceanographic sounding machine, presumed to have been used on HMS Challenger

Sounding machine, oceanographic Sounding machine, oceanographic

One of a collection of deep sea sounding machines - Hydra type of sounding machine, larger size, presumed to have been used on HMS Challenger

Sounding machine, oceanographic Sounding machine, oceanographic

One of a collection of deep sea sounding machines - Baillie type of sounding machine, presumed to have been used on HMS Challenger

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