[Julke]

Originally Posted by steineib

hmm whats with this here ? http://www.ebay.de/itm/Orig-Hanhart-...item2338c71afe

Look's interestening, but that's for measuring time of torpedo hit, not for measuring speed of vessel. Submarine attack officer knew estimation time of torpedo impact so in case of "no hit" he knew that it's time to reload the tube