Surveying
The sensitivity of a bubble tube can be increased by

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

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Surveying
The cross hairs in the surveying telescope are placed

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

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