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

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
horizontal line is normal to plumb line while level line may not be normal to the plumb line
both are same

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Surveying
Bowditch rule is applied to

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

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