Surveying
The sensitivity of a bubble tube can be increased by

decreasing the radius of curvature of tube
decreasing the length of bubble
increasing the viscosity of liquid
increasing the diameter of the tube

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Surveying
For mapping any country

Geodetic triangulation of greatest possible sides and accuracy is carried out
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys
All listed here

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Surveying
The difference between a level line and a horizontal line is that

horizontal line is normal to plumb line while level line may not be normal to the plumb line
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
level line is a curved line while hori-zontal line is a straight line
both are same

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Surveying
Bowditch rule is applied to

None of these
a closed traverse for adjustment of closing error
determine the effect of local attraction
an open traverse for graphical adjustment

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