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Question
An area of a plan is to be determined by using an Ambler polar planimeter. What does 'N' mean in equation of area = M(F - I ± 10 N + C) of this planimeter?
A.
Number of stations in the plan
B.
Number of sides of the traverse
C.
Number of cellular units of plan
D.
Number of complete revolutions of the disc
Answer ( Option D)

Number of complete revolutions of the disc

Solution

1. The areas between curved boundaries are also computed by planimeter from the map of the area. Most commonly used in Amsler polar planimeter.
2. The formula for calculating areas of the map by using planimeter.
Area (A) = M × (F - I ± 10 N) + C
where,
M = Multiplying constant
F = Final reading of planimeter
I = Initial reading
N = Number of times zero of dial pass is index mark/number of revolutions of wheel on one complete tracing.
C = Constant marked above scale division on tracing arm (constant C is used only when the anchor point is placed inside the plan)

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