In this context a periscope refers to a device that can rotate to provide a wider field of view or is fixed into an assembly that can , while an episcope is fixed into position. 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. Top Countries Turkey

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. Twitter triples profits, global user base steadies.

Chief Executive , The Proving Factory. Submarines traditionally had two periscopes; a navigation or observation periscope and a targeting, or commander's, periscope.