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There are two methods of doing this, one by means of a planimeter or averaging instrument, and the other by means of lines called ordinates.

At least two such readings were taken for each home range; then these planimeter values were converted into square feet.

We saw also a planimeter, which not only calculated mechanically the area of a figure, but gave also its center of gravity, moment of inertia, etc.

Areas were measured with a planimeter; distances traveled by individuals were measured with a cartometer.

The apparatus used in engine testing, in addition to that used in boiler testing, consists of a steam engine indicator and reducing device for taking diagrams, and a planimeter for measuring them afterwards.