Surveying
According to Napier's Rules of circular parts for a right angled triangle, sine of middle part equals the product of

Cosines of two adjacent parts
Both (A) and (B) above
Sines of two adjacent parts
Tangents of two adjacent parts

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

By subtracting their longitudes if places are in the same hemisphere
All of these
By adding their longitudes if places are in the different hemispheres
By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres

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Surveying
The cross hairs in the surveying telescope are placed

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

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