. The railroad and engineering journal . door from the after compartment of the shield. The innerskin of the shield is composed ol ^-in. plating, and extendsfrom the plates forming the division of the shield carryingthe doors to within 2 ft. 4 in. of the cutting edge, and isseparated from the outer skin by a distance of i ft. 5 diaphragms of i-in. plates 3 ft. 2 in. x i ft. 5 in., Fig I We will now turn to details of the shields under consid-eration. The external diameter is ig ft. 11 in. by 10 ft. 6in. from cutting edge to tail of shield. The outer skin ismade up of two thicknesses
. The railroad and engineering journal . door from the after compartment of the shield. The innerskin of the shield is composed ol ^-in. plating, and extendsfrom the plates forming the division of the shield carryingthe doors to within 2 ft. 4 in. of the cutting edge, and isseparated from the outer skin by a distance of i ft. 5 diaphragms of i-in. plates 3 ft. 2 in. x i ft. 5 in., Fig I We will now turn to details of the shields under consid-eration. The external diameter is ig ft. 11 in. by 10 ft. 6in. from cutting edge to tail of shield. The outer skin ismade up of two thicknesses of |-in. steel plates, with in-ternal covers, and packing pieces between the covers, allof a similar thickness. A division of plates ^ in. in thick-ness is placed 5 ft. 8 in. from the cutting edge, and com-. Fig. 2. with 4-in. x 4-in. x ^-in. angles running completely aroundon each side, are spaced equidistantly around the shield be-tween the two skins, and arranged to coincide with the at-tachments of the horizontal and vertical girders alreadydescribed at their respective junctions with the inner doors are nine in number, of f-in. plates ; seven aresquare and dished, covering openings ranging from 2 ft. 6 in.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
