102 REPORT—1849. 
The same sets of rails that had been taken up from the Kingstown line in 
October 1844 were laid by in a dry place, passed through the same ordeal 
of heating to a bright red, cleansing and coating (one of the sets) as before; 
and on the 7th January 1845, the weighings being all completed, the three 
sets were again laid down on the Dalkey atmospheric single line railway, at 
a straight part of the line near the Dalkey terminus, in quite the same way 
and order as before, and fastened in the same way, the set of unused rails 
being laid at one side of the line of way. The direction of the railway at 
this place is nearly W.N.W. and E.S.E., corrected for variation; and the 
traffic is here in both directions over the same rails. 
The rails were continued on this line for the long period of four years; 
and on the 7th January 1849 were removed and weighed after prior exami- 
nation as to state of surface and magnetism, &c. ‘The results are given in— 
Taste No. 3.—Third set of Experiments on the Dalkey Atmospheric Rail- 
way: rails traversed from W.N.W. to E.S.E. and the reverse: period from 
January 7, 1845 to January 7, 1849=1460 days. 

Weight of Weight of Gross weight| Gross weight} Total loss First dif-|Second dif. 
g/8 ; 4 : 
E 4 g ah tel rails as weigh-|"ils as weigh-| “of the set | Of the set | of weight | ference | =diff. be- 
_— 2 a 
Ne 





ed together | €d together | when laid | When re- in each |=corro- | tween cor. 
when exposed.|When removed). down. moved and set. sion in | in use and 
and cleaned. cleaned. use. | out of use. 
1|° Set No. 1.) |cwt  8tS+ jewt = gis, grs. grs. grs, ers. ers. 
g|° In middle 
~ | of line, and 
3|° not travel- 
6+ 8,500| 6— 9,250 
ese oe) 
led over. 
4|: 7 
5).0.| Corrosion [| &+28,625 | 6+18,125 
ERT ile age DE ceca Cea ae ..| 9,445,125 | 9,411,875 | 33,250...) 00... 
———S-s |) —— ——_ |——_—_ 
_ 
| 
Set No. 2. 6—14,500| 6—58,750 
HI Lee 
3\" On the East 
o | sideof Line. 
4 
oe Corrosion 
5\ and 
pane abrasion. 
Geen © PPO EM Scsanesacacsses|, cxeve sss eee.e-| 9,482,875 | 9,349,250 | 83,625) 8800 
| 

| 
| 
i] 
g| | Set No. : 6— 9,625 | 6—44,650 24,450 
S Broken out 
..- | Onthe West 
3}. sideof Line. ie ah 
4). Coal-tarred. 
511 abrasion [| &— 93625 a ta 9,388,750 | 9,329,575 | 59,175 
6| only. wa 

