. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc. of the world. Fig. 9. parallel to the two other coordinate planesdivide each strip into infinitesimal triangleseach having one side parallel to each coordinateplane. As before, the sum of the circulationsaround all the triangles is equal to the circu-lation around the contour. Let us considerone of these triangles, BCD, Fig. 10, and let A.

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