Figure 8. Skead sounder invented by Francis Skead during telegraph survey operations between Malta and Crete off HMS TARTARUS in 1857. This device was designed to mitigate problems with the Brooke and Bonnici sounders. The first would sink in soft sediment without detaching the weight while the second rarely returned samples.

Image ID: ship4208, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Photographer: Y. Berard
Credit: Oceanographic Museum of Monaco

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