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    Re: Was this optical instrument designed for celestial navigation?
    From: Wolfgang Hasper
    Date: 2016 Feb 4, 15:35 +0100
    Hi there,
     
    The German term for dip is "Kimmtiefe"
    Kimmtiefenmesser makes a lot of sense, linguistically :o) KTM a meaningful abbreviation
     
    It remains a dip meter, technically.
     
    Regards
     
    Wolfgang
     
    PS:
    a "Tauschenmesser" is nonsense, with or without Koinzidenz
     
     
     
    Gesendet: Donnerstag, 04. Februar 2016 um 08:29 Uhr
    Von: "John Morris" <NoReply_Morris@fer3.com>
    An: wolfgang.hasper@web.de
    Betreff: [NavList] Re: Was this optical instrument designed for celestial navigation?

    HS, thanks for the suggestion.

    We had an even longer thread on the Ktm running on Wehrmacht Awards site and I would like to quote on of member LeBreton's posts there:

     believe this to be a Koincidenztelemeter, "Ktm" is the usual abbreviation. It can be found on some 3 and 4 meter basis Em's, but these measure distances, no angles. It superimposes two pictures, thereby allowing to measure an angle to the horizontal. The purpose of the instrument: I don't have a clue. Might have the same function as a Torpedoauswanderungsmesser but ment for use on smaller ships?

    He's from Belgium.  Anyway as you probably know, like many optical rangefinders, the German device under discussion incorporates visual coincidence of two images to allow the operator to stop adjusting when the desired value is reached so he can read it from the scale provided.  The Germans used the word or prefix "koincidenz" to identify the feature described, from what LeBreton is telling us.  So my guess at this point is "Koincidenztauschenmesser."

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