Surveying
The sensitivity of a bubble tube can be increased by

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

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Surveying
For mapping any country

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

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