<< Previous Section Table of Contents The Polar Planimeter Page Numbers Next Section >>

CHAPTER IV.

Measurement of Plane Areas.

III. Measurement of Large Areas.

Formula for Area.

In the operation just described
Let A = Area of Figure
y = Value Relative Vernier Unit.
r1 and r2 = First and Second Readings respectively.
C = Constant for given Scale and Setting.
Then
A = C + (r2 – r1)y ... (1)

It is evident that, as in the case of measurement of small areas if the actual area is Sq. Ins., of the given figure is required, it is at once obtained by multiplying by the value of the Actual instead of Relative Vernier Unit for the given scale.

<< Previous Section Table of Contents The Polar Planimeter Page Numbers Next Section >>