FIG. 13. Four quantitative sampling imtruinents: la, b, Petersen grab open and
closed; 2a, b, van Veen grab open and closed (continuous warp rig not fitted);
3b, Knudsen sampler in lowering position ; 3a, the same coming up upside down
with sample in the cylinder (the scale beside 3a refers to drawings 1-3) ; 48, longitudinal section of the Enequist sampler (the scale refers only to this drawing);
4b, the same from outside. (Artist: Poul H. Winther. Reproduced with permission
from Thorson, l957a.)
closed; 2a, b, van Veen grab open and closed (continuous warp rig not fitted);
3b, Knudsen sampler in lowering position ; 3a, the same coming up upside down
with sample in the cylinder (the scale beside 3a refers to drawings 1-3) ; 48, longitudinal section of the Enequist sampler (the scale refers only to this drawing);
4b, the same from outside. (Artist: Poul H. Winther. Reproduced with permission
from Thorson, l957a.)