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CHAPTER II.

The Polar Planimeter.

As has already been stated, all forms of the simple Polar Planimeter of whatever make are essentially the same in principle and in the general relation and arrangement of parts. The various forms of the instrument differ from each other only in some one or more of the minor details of mechanical construction and in degree of refinement of finish.

In the best and most accurate Planimeters every device known to mechanical skill has been utilized to give to these instruments the delicacy of adjustment and operation so necessary to their accuracy and maximum efficiency while at the same time detracting nothing from their requisite strength and ability to withstand the wear and tear of intelligent continued service.

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