sight tube मीनिंग इन हिंदी

This optical element ( lens ) with the etched reticle is then mounted in the telescopic sights tube as an integrated part of the optics chain of the sight.
Though designed in 1988 as an interpretive post, with sight tubes pointing to other Bay Area landmarks and cities, the peeker function has since been rendered archaic and its environmental message is not widely known.
The Corrector consisted of a second map pointer on a second horizontal slider, with a crank that moved the horizontal slider fore and aft . A second arm suspended from the main sight tube was pushed up and down as the horizontal portion slid.
One of the best examples would be Shen Kuo ( 1031 1095 ), a polymath scientist and statesman who was the first to describe the magnetic-needle compass used for navigation, discovered the concept of true north, improved the design of the astronomical gnomon, armillary sphere, sight tube, and marine fossils in the Taihang Mountains ( hundreds of miles from the Pacific Ocean ), Shen Kuo devised a theory of land formation, or geomorphology.