How to know architecture : the human elements in the evolution of styles (1914)
Wallis, Frank Edwin, 1862-1929 · New York : Harper and Brothers · leaf 156
he crown orupper part of the arch does not bear down vertically onits supports, but pushes outward in its tendency to flatten.This any arch would surely do if not prevented by sidepressure. This direction of gravital force in the arch isa combination of vertical and horizontal pressure, andthe… … FIG. 52—THE ARCH THRUST the crown of the arch to the ground on either side. Astudy of Fig. 52 will make this clear. It is evident, therefore, that in using an arched roofover the nave of the Romanesque churches some pro-10 *33 HOW TO KNOW ARCHITECTURE vision to counter-balance this thrust, or kick/…
Architecture
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