Surveying
The correction applied to the measured base of length ‘L’ is

Sag = L³w²/24P² where w is the weight of tape/m
All of these
Tension = (P - Ps)L/AE
Slope = (h²/2L) + (h⁴/8L³) where h is height difference of end supports

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Surveying
Circumpolar stars

Are seldom seen near the pole star
Remain always above the horizon
Rotate round the North Pole
Rotate round the celestial pole

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Surveying
The cross hairs in the surveying telescope are placed

anywhere between eye-piece and objective lens
much closer to the eye-piece than to the objective lens
midway between eye piece and objec-tive lens
much closer to the objective lens than to the eye piece

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