Dual-view, immersible periscope

A dual-view periscope comprising:

• an elongated tubular housing having two ends, one of said ends having an upward oriented viewing opening through which an observer may look into said housing and the other end having an entrance opening arranged generally perpendicular to said viewing opening;
• means for partitioning said housing into at least two compartments, an upper compartment which encompasses said viewing opening and a lower compartment which encompasses said entrance opening, said partitioning means being structured and arranged so that, when said lower compartment is immersed in a fluid, light can travel between said upper and lower compartments while the fluid cannot;
• first reflection means mounted in said upper compartment so that an observer's line-of-sight is folded downwardly and oppositely to its initial orientation;
• and
• second reflection means mounted in said lower compartment such that it is in a position to intercept the observer's folded line-of-sight and direct it through said entrance aperture to provide a first view which is generally forward looking but offset with respect to an observer's natural line-of-sight and such that an observer may look directly at said second reflection means through said viewing opening and be provided with a second view which is offset and generally opposite to the observer's natural line-of-sight,
• said housing, said partitioning means, and said first and second reflection means all being fabricated substantially of plastic.