Surveying
If the focal length of the object glass is 25 cm and the distance from object glass to the trunnion axis is 15 cm, the additive constant is

0.1
1.33
0.4
0.6

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Surveying
Circumpolar stars

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

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