Question

How to use opisometer to measure the the distance of a curved line?

Answer 1

Answer:

The wheel is placed in contact with the curved line to be measured and run along its length. By counting the number of teeth passing a mark on the handle while this is done, the length of the line can be ascertained: line length = wheel circumference × teeth counted/teeth on wheel.

Answer 2

an instrument used for measuring curved lines (as on a map) and consisting essentially of a screw with a wheel-shaped nut that is made to rotate forward along the curved lines and then backward to its original position on the screw along a straight scale.

Measuring Length of a Curved line

1. Tie a knot at one end of the thread.
2. Place the thread at the beginning of the line and try to measure a small initial portion of the line which is relatively straight.
3. Place your thumb at the other end of the measured portion and measure next straighter portion.
4. Repeat the above step till the end of line is reached.