1 Annual estimates of the resident population by single year of age and sex for the United States: April 1, 2010 to July 1, 2013 (NC-EST2013-AGESEX-RES). 2  File Layout [PDF - 89k]. 3  Data [CSV - 16k]. 4  National estimates by demographic characteristics-single year of age, sex, race, and Hispanic origin.
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. In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45-degree angle. This form of periscope, with the addition of two simple lenses, served for observation purposes in the trenches during World War I. Military personnel also use periscopes in some gun turrets and in armoured vehicles.
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