Quote:
Originally Posted by Stealhead
I might be mixing up the TBT with another tool used on US Navy subs but anyway they did have a UZO of course with a different name.
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You have it exactly right, but you already pointed that out. US subs had two, one at each end of the bridge. This was needed because of the high periscope fairings. Early in the war the TBT was exactly like the UZO in that it had to be taken below for protection when the boat dived. Sometime around 1944 the US Navy developed a watertight case which allowed the TBT to remain on its stand at all times.