Surveying
The sensitivity of a bubble tube can be increased by

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

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Surveying
The meridian of a place is

A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
An arc of the great circle which passes through the place and is perpendicular to the equator
A great circle passing through the place and the poles
A semi-circle which passes through the place and is terminated at the poles

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