Viollet-le-Duc, Eugène-Emmanuel, 1814-1879, Van Brunt, Henry, 1832-1903 · Boston : James R. Osgood · leaf 363
the apex of tlieroof, the illusion disappears, and the expédient, which I hâve em-ployed as a precautionary measure, to prevent the sagging of the tie-beam, satisfies the doubt of the eye. This illusion then has warnedme of the real weak point in my truss ; it has prompted me to findout the only… … If, in Eig. 50, I construct a perfectly vertical pier, and if to thefîank of this pier at C I communicate the thrust of a vault, the arcC D will cause the pier to seem to bend inward at the point ofthrust C, especially if, at A, I hâve another arc which opérâtes to OCULAR IXSTIXCT IX DESIGX. 295…
Architecture
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