I think you will need an artillery expert to fully explain it's function but a semi educated guess would say it's related to range and altitude of moving targets. I wait with interest as well.
Please try to send message again. thank you for your help. Willi
For the Kriegsmarine = M and M.Dv.Nr. 232,29 II.
The best Militaria forum in France is here : http://deutsch-militaria.forumactif.us/
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