Showing posts from February, 2014

How to find out the area using Planimeter

Hi, Planimeter is a Surveying instrument which can be used to find out the area of a map or plan.  A Swiss mathematician Jacob Amsler Laffon built first modern planimeter in 1854. Many developments followed Amsler's famous Planimeter including the electronic planimeter.
We have three mechanical types of Planimeters:

Polar LinearHatchet Planimeter All Planimeter work on the same principle. There is a linkage, at one end is a pointer and the other is fixed for a polar planimeter and is restricted for a linear.The pointer is traced along the perimeter of the area of the shape is indicated on a scale.
There is a wheel attached to planimeter which rolls when the movement of the pointer is perpendicular to the axis of the wheel so, this movement is recorded. It will skid when the movement of the wheel is parallel to the axis so, this movement is ignored. That means that planimeter measures the distance which is traveled by the rolling of the wheel. Area of the shape is proportional to t…