237
OF ENGINEERING FORMULÆ.
Life of Rails. (R. Price Williams.)
(‘ Min. Inst. Civ. Eng.,’ vols. xxv. and xxvii.)
Iron Rails. Life of Rails
In Number j T _ of Trains, j In ToM'
Great Northern Railway— Rising gradient 1 in 200 .. Falling gradient 1 in 200 .. Lancashire and Yorkshire— Falling gradient 1 in 130 .. Slow speed—level 119,455 57,536 65,529 47,445 58,851 62,399 203,112 24,702,861 11,760,926 13,484,661 9,6?9,078 12,116,382 12,451,784 38,803,128
Value of 1 mile, allowing 569Z. for old material = 13712
Tons. d.
Cost per ton per mile with 12,000,000 = •0274
„ „ 24,000,000 =-0137
„ „ 36,000,000 = • 0091
Experiments at Camden Town. (C. P. Sandberg.)
Mark of rail .. ..
Crushed with tons
Worn out with tons
1 I 7 I H. I E» I N.
'3,680,000!4,140,00013,220,00<Jß,900,000 3,220,000
5,060,000 5,290,OXM,060,000'8,970,OMjB,520,000
Rails marked T, top and bottom formed of No. 2 iron, the
remainder of puddle bars.
„ Y, same as T, but the pile for the top slab of
puddle iron, without any No. 2 iron
„ H, top slab made of puddle bars hammered
after the first heat, and rolled after the
second heat.
„ E, the same as H, but rolled after the first as
well as the second heat.
„ N, Pile composed of puddle bars, without any
top slab.
* Raila similar to those marked E were laid down on the Great
Northern Railway, and had a Ufa of 13,000,000 toim.