Abstract
The general principles in coring with open barrel gravity corers are briefly discussed, and a gravity corer with a new, simple and efficient valve system is described. The coring tubes are rectangular and specially designed for scanning of the cores by x-radiography before extrusion. The closing mechanism of the valve system works in two steps: the valve is held in open position one when the lowering wire is taut, in open position two when the wire slackens and the corer penetrates the sediment, and closes automatically after sediment penetration when the wire tautens at the upheaval.
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