The Civil engineer and architect's journal, scientific and railway gazette . wall;the batter, B F or E A, by b; the height of « all by « ; the specificgravity of water by unity ; and that of the material by .v. Aftersome reduction, we have for the equation of equilibrium. 4 «^&-n —^n-{- .9Mh( := 0 («) ; (see Moseleys Hydro-statics, Art. 51), wliereM = area, and ni hori-zontal distance of cen-tre of gravity G from A ;M = i a (2 ,i- — 2 ft) =n (.r — 6) ; and ?n =i 2 .*; Therefore,s M ))j = 2 a X iV—b) s =moment about A ; whichsubstitute in the abovegeneral equation, 1+1: (1). 3* Given t

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The Civil engineer and architect's journal, scientific and railway gazette . wall;the batter, B F or E A, by b; the height of « all by « ; the specificgravity of water by unity ; and that of the material by .v. Aftersome reduction, we have for the equation of equilibrium. 4 «^&-n —^n-{- .9Mh( := 0 («) ; (see Moseleys Hydro-statics, Art. 51), wliereM = area, and ni hori-zontal distance of cen-tre of gravity G from A ;M = i a (2 ,i- — 2 ft) =n (.r — 6) ; and ?n =i 2 .*; Therefore,s M ))j = 2 a X iV—b) s =moment about A ; whichsubstitute in the abovegeneral equation, 1+1: (1). 3* Given the height of the wall = 24 feet ; batter each side,Ifeet; and the specific gravity of the material, 9 : to find thetliiekness at bottom and top. Here a = 24; ft ^ 4; and s = 2. i^ubstitute these values in (1), we have ,1- - 2 j- = 986 ; . • . X = 11 nearly = A B; and C D = 3. II. Let the vertical section of the wall be rectangular, or thesides vertical; to find the thickness at bottom :— Now area A B CD X J distance of centre of gravity from A = ^ »^. we have .c- + (4- ft)

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