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Originally Posted by JScones
Periscopes were fitted with "helical rods" (or "helical wires") that broke the water flow into general turbulance so as not to create any resonating eddies in the water (more on what an eddy is here http://en.wikipedia.org/wiki/Eddy_%28fluid_dynamics%29).
Note that this did not fix the vibration of the scope tube itself, just the conical part. The vibration in the scope tube was removed by adding an extending bracket which increased the tube's natural resonant frequency.
Some examples:
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Thanks for replying, now I understand
