Surveying
A plate parallel is the line on the plane of the negative

Parallel to the principal line
Along the bisector of the angle between the principal line and a perpendicular line through principal plane
Perpendicular to the principal line
None of these

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Surveying
The cross hairs in the surveying telescope are placed

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

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Surveying
In triangulation surveys

Sides are not measured excepting the base line
The area is divided into triangular figures
All listed here
Control stations are located from which detailed surveys are carried out

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