‘ 
La ON RAILWAY BAR CORROSION. 89 
a. mob travelled over Nol, manned (2) 
Noo marked (ea) 

L BES te 
coming UL time % 
N°3 marked (occ) 
Coal Tarre bee loSydney Parade 
ee E direction of rains mohow 
Be pe as re yl Oe OO ce EO OREN a ee 
fence. 


Thus the set No. 3, tarred over, is exposed to abrasion alone. The set 
No. 2 is exposed both to corrosion and abrasion; deducting therefore the 
' amount of the former from the latter, we get the amount of corrosion alone 
of the rails in use, and are enabled to compare this with the amount of cor- 
rosion of the set of rails No. 1 out of use, and thus at once to ascertain the _ 
difference, if any exists, and to determine the amount of abrasion for a given 
weight of traffic, of which returns are kept by the Dublin and Kingstown 
Railway Company. 
Half-sized section of Dublin and Kingstown Rail, taken accurately from a filed 
sheet-iron template of those experimented on, Sept. 1844. 
Z 
iy ty y 
fffyy 
Vj 


Fig. 2. 
Ly 
Z 

compressed 
wood 
weage 




Part of memel sleeper. 
_ The Dublin and Kingstown rails were made at the works of John Bradley 
and Co. of Stourbridge, and profess to be according to the specification of 
BO i's the Company’s Engineer of 1833, viz. “ Exterior surface of best 
rolled iron previously hammered, and the interior of the best 
=— puddiled iron previously hammered, the proportion being two 
S C parts of the former and five parts of the latter, and branded as in 
< margin.” 
The dimensions as to surface, &c. of the rails is as follows, in accordance 
with the foregoing section :— ‘ 
Total perimeter of the rail=11°5 inches:— 
Total surface per yard running=36 x 11°5=414 sq- ins.=2°88 sq. ft. 

