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Encyclopedia Britannica - Main :: SCY-SHA |
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SEVERN TUNNEL (4 M. 281 chains in length) . Percentage of Wear
lb per yard Down line, outside and quite clear of tunnel, % per annum. Bristol end, gradient falling t in loo . . . 0.280=0240 Up line, outside and quite clear of tunnel, Newport
At Bristol mouth, gradient falling I in too I 200 = I "020 33 chains from Bristol mouth, gradient falling I in too 2.160=1.860 3 m. 751 chains from Bristol mouth, gradient rising I in 90 1.900 =1.630 At Newport
Down and up line under main- shaft
It will be seen that the maximum wear
weight
great
engine
train passed, wore at a greater rate, presumably on account of the surface being kept bright and the gases being able to act on it. The Great
boxing up the rails, so that the ballast approached their surface within 1 in. or 11 in. It was found, however, thatin the case, at any rate, of the limestone ballast-the cure was almost worse than the disease, the result being a maximum wear of 21 lb and an average
average
See Proc. Inst. Cie. Eng.; also works on tunnelling by Drinker, Simms, Stauffer and Prelini, and on tunnel shields, &c., by Copperthwaite. (H. A. C.) End of Article: SEVERN TUNNEL (4 M. 281 chains in length) If you wish, you can link directly to this article.
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