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A point lies in the first quadrant if the plan lies below, the elevation above the axis; in the second if plan and elevation both lie above; in the third if the plan lies above, the elevation below; in the the fourth if plan and elevation both lie below the axis.


plan, I, x, y, elevation, axis, Quadrant, II, III, IV


Encyclopaedia Britannica (New York: The Encyclopaedia Britannica Company, 1910) 11:707


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