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Show oo POCKET PERISCOPES IN WAR. With a new pocket periscope that has just been brought out in England it is possible for a soldier to look over the parapet of the trench without exposing ex-posing himself to the fire of the enemy, en-emy, says Popular Mechanics. The periscope is simple in construction, consisting only of two mirrors connected con-nected by a collapsible framework. Both mirrors are fixed to the framework frame-work at an angle of 45 degrees When the framework is extended and the upper mirror is' raised above the trench, the view is reflected by tho upper mirror down to the lower one, which reflects the light rays horizontally horizon-tally to tho eyes of the observer. |