hi, my first post here
i´ve been reading along for a long time, but this is my first post.
sawdust, the answer to your question is the displacement, if the periscope is partially out of the water, and the sub begins to sink, the displacement of the sub under water grows and creates more positive boyancy. so the sub begins to rise, the positive boyancy will change eventually to negative boyancy and the sub will start to sink again. which will start the whole process over again.
in "das boot" buchheim explains it like that and says they called it "to hang the boat up from the scope". not sure of the translation, in german its "das boot am periskop aufhängen"
im sorry for my english, a little out of practice.
harlkin
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