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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Periscope
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INFOTEXT
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1992-09-02
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258b
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9 lines
A periscope is an optical instrument designed
for observation from a concealed position
such as from a submerged submarine. In its
basic form it consists of a tube with
parallel mirrors at each end, inclined at 45°
to its axis.
Subject by: Vince Pike