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Curvature: Simple:
"Articulate its tendency to curvature within one plane by the compression (strutted) positioning of every point of the line of curvature afforded by the parallelism of the staves and their inertia.
“In a simple curvature tube of paper all the circles of tension, including all the circles of compression, are parallel to one another and give one another no help. Therefore a cylinder may be flattened-- in which case each circle becomes a double line. In order to do this, we see that the tension circles exert all their pull in levering the many compression points within to compress exquisitely the two opposite, or polar, compression point. This is then, the genesis of the ultimate, two-way focussing compression tension line resulting from stressing simple curvature.”
