384 SEVENTH REPORT—1837. 
Tas_e ITI. 
North Wales Iron.—Coed-Talon No. 3 Iron, Cold Blast. 
Experiment 1. Experiment 2. ExXpeERIMENT 5. ExrERIMENT 4, 
Depth of bar, -996\|Depth of bar, 1:035||Depth of bar, *996|Depth of bar, 1°035 
Breadth of do. 1:005||Breadth of do. 1°017||Breadth of do. 1°015|| Breadth of do. 1°017 
Distance between Distance between  ||Distance between _ || Distance between 
supports, 4ft. 6in. || supports, 4ft. 6 in. || supports, 2 ft. 3in.||. supports, 2ft. Sin. 
h(i (gg CO i afm = a PE om) ge 
eae oot a | Seo her! ae Tes = zy/.88 
2 \eelee] = [esl Ze] = esl zZ8 = | ge| Be 
©) e2/Sai & lee|Sy & |ee/se] B | 2B) se 
File ARSE A POSE a 1A 5 ie ares 
28 | -067| ... 28 | -060| ... 112} -030 | ... 112 | -031 
56 |} 131} + 56 | -117| + 224/-068 | ... 224 | -060 
112 | +257/-010 || 112 | -231/-012 || 336):102 | + 336 |:092 | + 
168 | -400)-018 || 168 | :357|-023 || 448|-140 | + || 448} -122 |-005 
224 | -542/-030 || 224 | -491/-036 || 560)°178 |-006 || 560/-156 | -007 
280 | -695|-047 || 280 | -623/-050 || 672-217 |-008 || 672/-189 | 009 
336 | +850) °064 || 336 | °762)-069 || 784/-256 |-012 || 784 | +221 | -011 
392 | 1-022) -090 || 392 | -910|-089 || 896|-300 | -020 || 896 | -257 | -017 
448 | 1-204|-121 |} 448 | 1-070} -112 || 1008 | -549 | -031 || 1008 | -300 | -022 
504 | 1-400) 164 || 504 | 1-238) -148 || 1064 /°377 | ... || 1120| -340 | -031 
532 | 1-520 560 | 1-425) -191 || 1120} -408 | -045 || 1176 |broke 
560 |broke 1176 | -439 
- || 1204 |broke 
.. Ultimate deflec-||Broke with  thel|.. Ultimate deflec-|].:. Ultimate deflec- 
tion = 1°617. weight, 560 Ibs.,|| tion = °453. tion = °359. 
Broke at $ of an in.|| when putonagain.||Broke at the cen-|/Broke at the cen- 
from the centre. tre. tre. 
On comparing the Coed-Talon No. 2, cold blast, with the No. 3 cold blast iron, 
it will be found that the strength and also the power to resist impact is decidedly in 
favour of the last iron ; in the first instance the proportions are as 537°8 to 408°7, in the 
latter, 831°2 to 600°7, being a ratio of nearly 24 per cent. in favour of the No. 3 iron. 
The colour of this iron is a dull grey, with considerable uniformity in its crystal- 
line texture. It is a stiff iron, rather difficult to cut, and accompanied with a hard 
sensation under the file. 
Results reduced to those of hars 1:000 inch square. 
: Product 
wg, | Modulus of Breaking Ultimate | 5 ¥ ¢, or 
Specific | elasticity |"). deflection | | ower of 
gravity. | in lbs. per 6) in inches Last 9 
square inch. : (d). impact. 
Experiment Ist, bar 4 ft. 6 bea ' F 7 
_ in. between supports... 7124 17276800 | 561-7 1-610 904°3 
Hapenment Sud, tar27) 6) 16927200 | 514-0 | 1-475 | 758-1 
in. between supports 
Mean...) 7194 | 17102000 | 537-8 1542 | 831-2 
Experiment 3rd, bar 2ft=.3])) | une thei . 
in. between supports ...f} “"" 
Srcig ave wae and gh Speen a ere 10790 | -3715 | 401-0 
in. between supports ...f} “"" | * 
1137°3 | °4113 470-2 
IMERMocs|-- > cteces Ame ese nee 
