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level line definition

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a level line or level surface is one which at all point is 

normal to the direction of the force of gravity as defined 

by a freely suspended plumb - bob . as already indicated

 in chapter 1 in the discussion of the geoid, such 

surfaces are ellipsoidal in shape .

thus in figure 3.1 the difference in level between A and B 

is the distance A,B provided that non - parallelism of 

level surfaces is ignored