. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 278 THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. [Sept. Dimensions and Calculations. A B width of arch on the square O E height of arch A A' depth of arch at springing E T ditto at crown * AB»28^ + 20E122 AB28 + 20E12 BFor AEB=:^/ ^ ''' i ' 31416 2 \ C width of arch on the skew = sin obi. 60' 50' ; R :: A B 28: AC =32-065 B C = R : cosin obi. 60° 50' :: A C 32065 : B C =15-627 C L external width of bridge including projection of arch-stones 11 in. .. .. â¢â â¢â¢ 17-25 ^.ngle
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 278 THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. [Sept. Dimensions and Calculations. A B width of arch on the square O E height of arch A A' depth of arch at springing E T ditto at crown * AB»28^ + 20E122 AB28 + 20E12 BFor AEB=:^/ ^ ''' i ' 31416 2 \ C width of arch on the skew = sin obi. 60' 50' ; R :: A B 28: AC =32-065 B C = R : cosin obi. 60° 50' :: A C 32065 : B C =15-627 C L external width of bridge including projection of arch-stones 11 in. .. .. â¢â â¢â¢ 17-25 ^.ngle BFC = BF32-626 : BC 15-627 ::R: tan BFC .. 25° 35' 35" CF = sin BFC 25° 35'35" : R :: B C 15'627 : CF Convenient number of voussoirs, 31 Of 36-175 Thickness of ditto ârjâ C D from face to face of springer = R : cosin obi. 60o 50" :: C L 17-25: CD =19-755 D K= 7 courses x the thickness 1-167 =8-169 AngleDCKadjusted = CD 19-755 : DK8-169:: R :sinDCK 24° 25' 14" C M axial length=R : cot D C K 24° 25' 14" :: B F or M I 32-626: CM .. .. .. .. ri'85 Development of half the Arch C, I, m, n, o,p, q, to obtain the bevels for Heads of Arch-stones. Divide BE into a convenient number of parts and lay them on B/, dravf lines parallel to B C and the ordinates will be found by similar triangles,as A B : BC : : A 6' ; 6'm'and F B : BC : : F 6 : 6m. Then V m' â bh=zhm. Distances of Ordinates. Ordinates of Circle. On B 0. Radius 14 28 feet Be= -55 a a" = R'' or 0 a=-0 a- = a a- -/ = 13-645 6 e d = l-23 *4" = R2-0 4= = 6i"2V = 12-527 d c = 2-87 c c" = R2 â0 c'' = c c"^ a/ = 10-42 1 c i = 3-l dd" = 'R^-Od^ = dd"'V = 6-831 A a = 3-12 e e" = R2-0e'2=-e e"'V = 3-885 a 0 = 3-13 = 32-626 36-175 1-167 Divisions ore B E or B /. B a = l-80 a 4=1-81 6 0 = 3-22 e rf=3-20 d e = 3-15 e /=3-14 Ordinates calculated on C g. g ^=-561 /im = -736 i n = -689 j o = -478 k p = -238 Fig. 2. Elliptical arch on the square di
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