Juday—Limnological Apparatus . 
591 
The plunger is 2.5 cm. in diameter and 8.5 cm. long. About 
6 mm. at the upper end is larger in diameter, thus forming a 
flange which prevents the plunger from being forced en¬ 
tirely into the cylinder by the messenger. At the lower end 
the plunger possesses a pair of bent arms which occupy the 
slits in the outside cylinder. The plunger is supported by a 
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Fig. 9.—Anchor release. 
coil-spring made of brass wire which occupies the lower part 
of the hollow in the outer cylinder. Two small pins in the 
lower pairs of side projections on the outer cylinder prevent 
the spring from raising the plunger too high. The plunger 
is pierced by a hole just large enough to accommodate the 
anchor rope. 
The release is fastened onto the rope by passing entirely 
through the former, and tying a knot or two in the end. A 
line from the anchor is attached to the middle of a loop of 
rope about a meter long. One end of this loop is inserted in 
one jaw of the release and the other end is inserted in the 
17 
