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Updated: May 14, 2025
Three layers of sandbags were built above the salzdecke to protect the cylinder from shell fragments and to form a firestep for the infantry. This concealed the cylinders so efficiently that, in our own trenches, I have often found the new occupants of a sector ignorant of the presence of gas cylinders under their own firesteps.
The discharge valves were carefully protected by domes which screwed on to the cylinder. The latter were introduced into the holes, tops flush with the trench bottom, and covered by a board on which reposed the "Salzdecke," a kind of long bag stuffed with some such material as peat moss and soaked in potash solution to absorb any slight gas leakages.
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