. Bulletin . Tunnel No. 2 Tunnel No. 1 CROSS SECTIONS. Tunnel No. 1LONGITUDINAL SECTIONFigure 12.—Sections of Simplon Tunnel. of miles. It consists of two parallel, singe-track, masonry-linedtunnels, spaced 55^ feet apart between center lines, and having a King, C. R., The construction of the Simplon Tunnel : Eng. News, vol. 50, 1903, ; Saunders, W. L., Tunnel driving in the Alps : Trans. Am. Inst. Min. Eng., , 1911, pp. 441-446. 88 A PEIMEE ON EXPLOSIVES. cross section of the shape and size shown in figure 12. At first onlyTunnel Xo. 1 was driven to its full cross sectio
. Bulletin . Tunnel No. 2 Tunnel No. 1 CROSS SECTIONS. Tunnel No. 1LONGITUDINAL SECTIONFigure 12.—Sections of Simplon Tunnel. of miles. It consists of two parallel, singe-track, masonry-linedtunnels, spaced 55^ feet apart between center lines, and having a King, C. R., The construction of the Simplon Tunnel : Eng. News, vol. 50, 1903, ; Saunders, W. L., Tunnel driving in the Alps : Trans. Am. Inst. Min. Eng., , 1911, pp. 441-446. 88 A PEIMEE ON EXPLOSIVES. cross section of the shape and size shown in figure 12. At first onlyTunnel Xo. 1 was driven to its full cross section. A small 7 by 10foot gallery was driven in Tunnel Xo. 2, mainly for the purpose ofventilation and drainage. In Tunnel Xo. 1 the center bottom heading 1 (fig. 12) was drivenfirst. This was also 7 by 10 feet in section, and was timberedand covered with a closely boarded roof. From this heading araise was driven up to the roof line every 164 feet. The top heading2 was then excavated by working in both directions from each shallow transvers
Size: 2261px × 1105px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
