ON THE STEENGTH OF PILLAES OF CAST lEON. 
871 
Second Summary. 
Results of all the Experiments in Tables II. and III. on Solid Pillars of Cast Iron, 
10 feet long, cast from models 2^ inches diameter, and supplied from Low Moor, 
and from Messrs. Easton and Amos ; with applications to the formulae for their 
strength on different suppositions ; and also the weights which would crush the 
pillars. 
Description of Iron of which the 
pillar was formed. 
Breaking weight 
of pillar. 
Value of O’ from 
formula 
W 
where W is the 
breaking weight, 
D the diameter, 
and O' the breaking 
weight of a pillar 
1 inch diameter 
and 10 feet long. 
Value of from 
formula 
W 
, 
where W is the 
breaking weight, 
D the diameter, 
and X the breaking 
weight of a pillar 
1 inch diameter 
and 1 0 feet long. 
Weight whieh 
would crush the 
pillar, calculated 
from Table VIII. 
Old Park Iron, No. 1. 
Stourbridge. Cold blast. 
lbs. 
667921 
65381 j 
Mean. 
> 66086 
lbs. 
2571-5' 
2436-8^ 
> 2504-1 
lbs. 
2692-2' 
2552-3 
^ 2622-2 
lbs. 
433350 
441350^ 
^ 437350 
Derwent Iron, No. 1. 
Durham. Hot blast. 
57855] 
67733 J 
> 62794 
2147-2] 
2556-6 J 
> 2351-9 
2249-2 
2677-4, 
> 2463-3 
488060' 
483440 J 
> 485750 
Portland Iron, No. 1. 
Tovine, Scotland. Hot blast. 
^9' ^^161147 
62559/ 
2332-8 ] 
2328-3 J 
> 2330-5 
2441-81 
2438-8 J 
> 2440-3 
462760] 
475460 J 
> 469110 
j Calder Iron, No. 1 . 
Lanarkshire. Hot blast. 
606771 
60677 J 
> 60677 
2379-71 
2283-8 _ 
. 2331-7 
2490-7 
2391-8 J 
> 2441-2 
412200' 
421850. 
> 417025 
London Mixture. 
One-half old plate iron and one-half 
Calder Iron. 
545621 
59266 J 
. 56914 
2013-7" 
2141-9 J 
> 2077-8 
2109-4 
2244-4 
^2176-9 
407790] 
412630 J 
. 410210 
Level Iron, No. 1. 
Staffordshire. Hot blast. 
54091 
56443 
? 55267 
2038-81 
2179-2. 
• 2109-0 
213.5-2' 
2281-5 J 
^ 2208-3 
339700 
335130 
> 337415 
Coltness Iron, No. 1. 
Edinburgh. Hot blast. 
56443] 
48917 J 
■ 52680 
2133-5] 
1902-1 J 
> 2017-8 
2234-2 
1991-1 J 
> 2112-6 
313460] 
308505 J 
. 310980 
Carron Iron, No. 1. 
County of Stirling. Hot blast. 
522101 
53151 
. 52680 
2001-61 
2026-1 
. 2013-8 
2095-7 1 
2121-6 J 
^ 2108-6 
3379101 
338990 J 
. 338450 
Blaenavon Iron, No. 1. 
South Wales. Cold blast. 
48917 
49858 
> 49387 
1926-71 
1930-5 J 
> 1928-6 
2016-5 
2020-9 
■ 2018-7 
3444601 
347800 
346130 
Old Hill Iron. No. 1. 
Staffordshire. Cold blast. 
446831 
45154 
44918 
1679-51 
1690-0 J 
1684-7 
1759-01 
1770-0/ ^ 
2731301 
273780. 
273455 
: Second London Mixture. 
One-third No. 1 best Scotch pig iron, 
and two-thirds old metal. 
634991 
58325 _ 
60912 
2417-21 
2268-0 
2342-6 
2531-1 1 
2374-1 _ 
2452-6 
472120 1 
466490. 
469305 
Low Moor Iron, No. 2. 
Yorkshire. Cold blast. 
559731 
55973 J 
55973 
2008-91 
2048-5 _ 
2028-7 
2105-21 
2146-1 , 
2125-6 
.397590 1 
393240 J 
395415 
Blaenavon Iron, No. 3. 
South Wales. Cold blast. 
569141 
57855 
57384 
2034-1 1 
2096-7 J 
2065-4 
2131-8' 
21 97-0 J 
2164-4 
428540] 
425190 J 
426865 
5x2 
