. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. Chap. I. PIERS AND VAULTS. 359 1373. If to this experiment tlie |)riiicit)les o mediaiUL-s buapplied, consideiinj^ tlie pline of 30 degrees incliiialiun ;is ;ihorizontal plane, the vertical faces KU FR may be consideredas inclined planes of 60 degrees. On this hypothesis it may l-edemonstrated by mechanics, that to sustain a body between twoplanes firming an angle of 60 degrees {fg. , the resist-ance of each of these planes must be to half the
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. Chap. I. PIERS AND VAULTS. 359 1373. If to this experiment tlie |)riiicit)les o mediaiUL-s buapplied, consideiinj^ tlie pline of 30 degrees incliiialiun ;is ;ihorizontal plane, the vertical faces KU FR may be consideredas inclined planes of 60 degrees. On this hypothesis it may l-edemonstrated by mechanics, that to sustain a body between twoplanes firming an angle of 60 degrees {fg. , the resist-ance of each of these planes must be to half the weight sustainedas H D is to DG, as the radius is to the sine of 30 degrees, oras 1 is to \^^^^ Fifi. .)fi6.
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