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Figure 3.2: Planimeter

Calculating the planimeter constant involves plotting out circle of known areas, placing the anchor base outside of the area

and

inserting

the

anchor

arm

into

the

drum

assembly.

Once

a square and a to be measured, the planimeter

reading is set

to zero

a clockwise

motion

the perimeter is traced in disk, drum, and vernier

(or the initial reading is and the final readings

recorded), from the

recorded. The disk reads whole numbers, the drum tenths and hundredths unit, and the vernier thousandths of a unit. Three readings of each of the areas should be taken. Finally, the values derived from areas of the square circle are averaged.

of a two and

The

planimeter

reading from

calculations

is used to

solve for the

the average of circle and square

constant

C=

N/A.

The

value

N

value is the

planimeter

reading, A

constant.

Once the

is the known area of the object and C is planimeter constant is determined, new

the planimeter areas may be

29

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