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Detaching claws and sinker weight for depth sounding, made by Carmelo Bonnici

1857
Weight-detaching mechanical sounder for gauging the depth of the sea floor and collecting sediment samples, designed by F. Skead and used on HMS Tartarus, 1857, during telegraph survey operations between Malta and Crete. The original had a 68 lb cannon ball as sinker weight; this object has a fibreglass replica.

Skead's detaching-weight sounder used for telegraph survey operations

1857