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First describe the Hexagon PPP, &c, then* 1.1 divide the Interior Polygon PP, into 1000 equal parts, take 125 for the Gorges, and set it from P to C. Then on C raise a Perpendicular, make it equal to 138 parts, for your Flanks CF, then draw the Face AF, falling on the third part of the Curtain CC, at D, and so do on every Ba∣stion, untill the work is compleated.
Fig. 74.