. Railway age . neer tor filling up the cavity, aswell as for the prevention of future accidents. All the plans wereduly examined, and attentively considered; and the board of direc-tors , under date of the ICth of December, 1828, their obli-gations to the many scientific men who had so spontaneously com-municated their several ingenious suggestions for securing andcompleting the undertaking. HHIM IB ■i^^^^^l ^H mm mm ^^^H ^^^^^H ■■ ^^^^^^^^1 1, 1.—Till- woodeu ring; The Iron onb. :!.—IliKips. or lalbs, blndhig togetbcr tbc ii|)), 4.— liiiii nids enclosed III wiHid I ScTPw
. Railway age . neer tor filling up the cavity, aswell as for the prevention of future accidents. All the plans wereduly examined, and attentively considered; and the board of direc-tors , under date of the ICth of December, 1828, their obli-gations to the many scientific men who had so spontaneously com-municated their several ingenious suggestions for securing andcompleting the undertaking. HHIM IB ■i^^^^^l ^H mm mm ^^^H ^^^^^H ■■ ^^^^^^^^1 1, 1.—Till- woodeu ring; The Iron onb. :!.—IliKips. or lalbs, blndhig togetbcr tbc ii|)), 4.— liiiii nids enclosed III wiHid I ScTPwiil tiKbta. 5.—Woodin road | toui curb. till top nnd tbe bl A transverse section of llic Iminel is here given, showing thedimensions of the mass of lirickwork, which is all firmly sel inRoman cement. it must be observed that the middle wall Is, for greater securitywhile in progress, built quite solid; but for convenience, light andgeneral offeit, a succc.~.-;uin of arches are subsequently opened in. Longitudinal Section of Tunnel. that middle wall, so as to admit of frequent communications betweentwo carriage ways. The dimensions of the excavation under the rivtr are 28 by 22 ft. (! in. high; the whole area of which is constantlycovered and supported by the shield In 12 divisions, which arc ad-vanced alternately and independently of each other; they have eachthree floors, or stages, forming a succession of scaffolding and cellstor the bricklayers and mines during their operations. A longitudinal section of about 40 ft. of tbe tunnel, with a sideview of the shield, and the miners as well as the bricklayers atwork. This sketch represents also the moving stage, with twofloors, used by the miners to throw thereon, for removal, the earththey excavate; and where the bricks, cement and other materialsare placed in readiness for the bricklayers. Towards the head andfoot of the shield is shown the position the horizontal screws,a pair of which being attached
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Keywords: ., bookcentury1800, bookdecade1870, bookidrailwayage44, bookyear1870
