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ESAW Periscope (LO-6412)An optical instrument that permits the view of an otherwise obstructed field above or below the level of viewer. Comprising a Z shaped square tube with both the projecting arms having plane mirrors mounted at 45º facing each other.LO-6412     Periscope, plasticLO-6412     Periscope..

An optical instrument that permits the view of an otherwise obstructed field above or below the level of viewer or above view. Comprising a Z- shaped square tube with both the projecting arms having plane mirrors mounted at 45o facing each other. ..