Excerpt from Treatise on the Various Elements of Stability in the Well-Proportioned Arch: With Numerous Tales of the Ultimate and Actual Thrust
In almost all practical cases this true thrust is due to rotation, and is developed at the instant of equilibrium preceding rupture ... and fall. For convenience we have called this the ultimate thrust. It is obviously much less than the actual thrust of the well-established arch nor has any relation between the two been hitherto pointed out.
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