A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: John Morris
Date: 2016 Feb 3, 23:20 -0800
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."