Paranoid_Womb
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The side of the barrel of this peculiar device seems to be marked "Jr.Fl.M.W.Na.22.N". I was unable to find any info on this weapn until I found something very similar in "German Assault troops of WW1" from T. Wictor.
There he shows a Heavy 240 cm trench mortar "Iko" (Schwerer Flügelminenwerfer "Iko") with Iko standing for Ingenieur-Komitee (Engineering Committee). The weapon is based on French mortars. The device weighed over a ton and required 42 to reposition it. 20 shells could be fired per hour and the range was slightly over 1 km. The device was mounted on wooden railroad ties (crosstie, railway sleeper) and was positioned in a pit of approximately 2 x 1.5 m and 0.5 meter deep. Fixation required more railway ties and wooden wedges.
Clearly, the device seen here fits this description, although it is not completely similar. I presume the example I have concerns an imporved version, designed by the engineering committee at a later stage of the war. The barrel here is longer and the mechanism to adjust the height is more elaborated.
To get back to the markings on the side, and to relate this to the description found in literature, the "Fl.M.W." no doubt stands for Flügelminenwerfer. "Na" might suggest neuer Art, but I think "nA" would make more sense.
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