Surveying
The following sights are taken on a “turning point”

foresight only
foresight and backsight
foresight and intermediate sight
foresight only

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

level line is a curved line while hori-zontal line is a straight line
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
both are same
horizontal line is normal to plumb line while level line may not be normal to the plumb line

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