<< 
GENERAL SUMMARY OF RESULTS OBTAINED PROM THE PRECEDING EXPERIMEN 
RECTANGULAR BARS OF CAST IRON: 
Each bar being reduced uotl 
5 ON 
y one inch 
sq 
Tn the following abstract, ( which may be taken as a criterion of the value of en 
elween th 
PE 
All the other y 
h iron, is obtained from the mean of the expe e 
und next, on those of half the length, or 2 eenIRROER ene 
iced from the 4ft, Gin. bars 
{t. 3in. between supports 
Whitish 
gray 
( 15 ) 
7 INStieeiieiedelste = 15168000 
8 id Mill End 2, Cold Blas 16490000 
9 | Old Par 14607000 
Beaut 16301000 
5 | 14509500 
Rather § 
Hard 
T Soft 
Fluid 
)4.000 
2666 
| Frood, No. 
Lane End, 
16966 . it 
Sul ather soft, 
71500 Flaid 
| Soft. 
=<} ather soft. 
Dull 
Lig] 
). 3, Hot Blact 
ery, No. 1, Hot Bl 
| Level, No. 1, Hot Blast.. | 
. | Pant, No. 2 | 30900 
| Le N 11000 
W 9 ; 
oundry, } Hot B 211000 
2, Cold Blast . 
«Hard 
ather Soft. 
.+--Hard 
Gray. . 
Whitish G 
Gray... 
41 | Carroll, No. 2, C ‘last. . 
42 | Moirkirk, No. 1, Hor Blast 
47 | Ley’s Wo No. 1, Hot B 
48 | Milton, No. 1, Hot Blast 
57 | Rather Soft. 
eee een ne EE 
| 
| 
| 
46 | I nd, No. 2, Hot Blast...... 
49 | Pla 
ynaston, No, 2, H 
‘The irons with asterisks are taken from the Experiments on Hot and Cold Blast Iron, made by Mr. Hodgkinson and myself for the British Associa- 
tion for the Advancement of Science, ‘ee Seventh Report, Volume VI. 
+ The modulus of elasticity was usually taken from the deflection caused by 112lbs. on the ‘ft, 6in. bars 
RULE. 
To find from the above table the breuking weight in rectangular bars, generally, calling & and d the breadth and depth in inches, and / the distance betweon 
45x bd 
the supports in feet, and putting 4.5 for 4ft. 6in., we have. ; 
veaking weight in lbs.—The value of § being taken from the table above. 
For example; What weight would be necessary to break a bar of Low Moor Iron, 2 inches broad, 3 inches deep/and 6 feet between the supports? Accord- 
ing to the rule given above, we have =2 inches, d=3 inches, /=6 fect, S=472 from the table. Then #2%® US ie GEV, 
the breaking weight. 
