Abstract

A thin-walled and tight core-retainer, which can be used also as a quick-acting valve for various purposes, was built in different models and successfully tested at sea. It is based on a cloth valve originally adapted to corers by H. Delauze, but twisted in this device, by an encasing torsion spring released by a latch. This latch is directly actuated by the sediment during the pull-up.

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