By Harold Barnes
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Additional resources for Oceanography And Marine Biology: A Book of Techniques
The smaller internal diameter is not required in the piston sampler to obtain longer cores by reducing Oceanography and marine biology 48 Figure 32 The Kullenberg piston corer Diagrammatic: a) Piston in mouth of corer b) Corer in set position c) Balanced lever for suspension (B. Kullenberg, ‘Svenska Hydrografiskbiologiska Kommissiontns Skrifter’, 1947; Redrawn from original) the internal wall friction, but a reduction in this is still desirable to prevent distorting the peripheral parts of the sample.
Figure 18 The Petersen-type grab In the Petersen (Figure 18) or van Veen type of grab two semicircular buckets are hinged along a central axis. The buckets are held apart by some form of catch. On striking bottom this is released, so that on hauling the buckets move round on their axis, Oceanography and marine biology 32 take a bite out of the ground, and eventually come together to form a closed container. Neither of these grabs is invariably successful on all types of ground and under all working conditions.
The length of a core taken with an instrument driven into a sediment, either by its own weight and velocity or by an explosive charge, is always less than the depth of penetration of the coring tube. Depending upon the instrument and the type of sediment, the core itself may vary from 40 to 70 per cent. of the depth of penetration. To what extent then does a point on the core correspond to the original sediment? Does material escape from the tube mouth, or are the layers simply compressed into a shorter length?