Periscope that allows the view of an obstructed field above or below the level of viewer.
It is a Z shaped tube with mounted mirrors on both sides at 45° facing each other.
Periscope, (Wooden).
Brass dial head 40 mm diameter divided and marked in 100 divisions, vertical scale 10-0-10 mm, fitted on heavy brass disc, with 3 pointed legs, distance between legs 40 mm.
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