Original British WWI Mk IX Trench Periscope By R. & J. Beck Ltd. Dated 1918 MP 34 inverted-V12 aero engine

inverted-V12 aero engine

There is an additional wrap added near the top at a later time

Hard fighting still lay ahead

but in that time went to the ends of empire

Original British WWI Mk IX Trench Periscope By R. & J. Beck Ltd. Dated 1918 MP 34 inverted-V12 aero engineOriginal Item: Only One Available. A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line of sight observation from an observer's current position. In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45 angle. This form of periscope, with the addition of two simple lenses, served for observation purposes in the trenches