Surveying
The sensitivity of a bubble tube can be increased by

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

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Surveying
Systematic errors

Are also known as cumulative errors
Can be removed by applying corrections to the observed values
Always follow some definite mathematical law
All listed here

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Surveying
A telescope is said to be inverted if its

vertical circle is to its right and the bubble of the telescope is up
vertical circle is to its right and the bubble of the telescope is down
vertical circle is to its left and the bubble of the telescope is down
vertical circle is to its left and the bubble of the telescope is up

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