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.
Posted on July 24, 2009 by Paul Fitzgerald. A videoscope is a flexible inspection instrument that consists of a flexible insertion tube with a video display at one end and an objective lens at the other. The image is produced using a CCD camera chip 1/10 th inch or smaller in diameter.The image is relayed from the inspection area to the video display electronically. An internal fiber optic light guide, or LED lighting at the objective, is used to illuminate the area being inspected.he image is relayed from the inspection area to the video display electronically. An internal fiber optic light guide, or LED lighting at the objective, is used to illuminate the area being inspected.