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How to make periscope with cardboard | School project | Diy | DM
How to make periscope with cardboard | School project | Diy | DM 10x12 inch cardboard sheet 1 11x6 inch cardboard sheet 2 2.3x3.5 inch mirror glass 2 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 ...
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