ON STRENGTH AND PROPERTIES OF CAST IRON. 
391 
Tas. VII.—Scotch Iron.—Carron No. 3 Pig Iron, Cold Blast. 
EXxprERIMENT 1. 
Depth of bar, 1-020 
Breadth of do. 1°010 
Distance between 
supports, 4 ft. 6 in, 
2 3 
a|eei\3s 
2 |83| 8: 
@iee\e% 
= aS 
28 | 068 
56 | 129) + 
112 | -253) :010 
168 | -401! -020 
224 | +552) -038 
280 | :718!| -061 
336 | -890)| -090 
392 |1:079 | -120 
448 |1-281/| -169 
469 |broke 
.. Ultimate deflec- 
tion = 1°351. 
Broke 1 inch from 
the centre. 
EXPERIMENT 2. 
Depth of bar, *997 
Breadth of do, 1°001 
Distance between 
supports, 4 ft. 6 in. 
Fs .2 
Pee Be 
eles | me 
a ee | os 
© | s218s 
‘oD A &é A oC 
5 4 
28 | 071) + 
56 | :140| -007 | 
112 | -278) -013 
168 | -430) -027 
224 | 590) -046 
280 | -755 | -069 
336 | -946; -098 
392 |1-142 | +136 
420 |1:249 
434 |broke 
.. Ultimate deflec- 
tion = 1°297. 
ExreRIMENt 3. 
EXPERIMENT 4. 
Broke 3 of an inch 
from the centre. 
Depth of bar, *995||Depth of bar, 1:024 
Breadth of do. 1:005||Breadth of do. 1-000 
Distance between Distance between 
supports, 4 ft. 6 in. || Supports, 2 ft. 3 in. 
i a) aley| a3 
‘3 AA ag 3 |Aaf lag 
5 ; af F tel 
28 | -070 112 | 032! ... 
56 | 188) -007 || 224 | 067) + 
112 | -270| -011)|| 336 | 100, + 
168 | -422| -025 || 448  -137) -006 
224 | -587| :046|| 560 | 177) -009 
280 | :749| -067)| 672 | +215 | -014 
336 | -928)| °095 || 784 | -258) -022 
392 |1:122! -132|| 896 |broke! 
420 |1:223 | . 
448 broke | 
.. Ultimate deflec-||.°. Ultimate deflec- 
tion = 1°315. tion = *297, 
Broke 3 of an inch||Broke 1} of an inch 
from the centre. 
from the centre. 
EXPERIMENT 5. 
Depth of bar, 1:008 
Breadth of do. 
Distance between 
"999 
supports, 2 ft. 3 in, 
a |28/3% 
6p o Ss 
on ad a a 
5 4 
112 | 033) ... 
224 | 071) + 
336 | ‘110; + 
448 | -149| 007 
560 | -189}| :010 
672 | :233| :017 
784 | 280} 023 
896 | :337| :037 
952 |broke 
.. Ultimate deflec- 
tion = *360. 
Broke % an inch 
from the centre. 
Carron No. 3, cold blast, indicates (when viewed with a magnifier) an exceedingly 
close texture, with a rich sparkling grey colour. 
than usual softness, and yields freely either to the chisel or file. 
For No. 3 iron, it possesses more 
I should consider 
it in no way inferior to most No. 2 irons in relation to its power of being worked. 
Results reduced to those of bars 1:00 inch square. 
Experiment 
in. between supports 
Experiment 2nd, bar 4 ft. 6 
in. between supports 
Experiment 3rd, bar 4 ft. 6 
in. between supports 
Experiment 
in. between supports 
Experiment 
in. between supports 
Modulus of 
Specific | elasticity 
gravity. | in lbs. per 
square inch, 
Ist, bar 4 ft.61) 7954 | 16259100 
7135 | 15987300 
ve | 16494500 
Mean| 7094 | 16246966 
4th, bar 2 ft. 3 
bth, bar 2 ft. 8 
eeecee eevee 
Breaking | Ultimate |Product b X 
weight | deflection | % °F power 
(0). (a). of resisting 
impact, 
446:3 1:410 6293 
436:2 1-293 564-0 
450:2 1:307 5884 
444-2 1:336 593-9 
8545 , 3041 | 259-9 
937:9 | +3629 3403 
896-2 3335 300-1 
