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periscope
A periscope is an instrument for observation from a conceale position. In its simplest form it is a tube in each end of which are mirrors set parallel to each other and at an angle of 45 with a line between them.
Trivia about periscope
This instrument, in its simplest form a tube with mirrors, enables the sub crew to see above the surface of the water
At the bottom of the Encarta article on this device are links to "optics" & "submarine"
The U.S. Navy uses the Type 18 one of these, named for its 18-times magnification