874 
ME. HODGKINSOJf’S 
Third Summary . — Comparison of the 
EXPEEBIEXTAL EESEAECHES 
Crushing Weights, Breaking Weights, ultimate 
diameter, the lengths being different, and the 
Description of Iron in the Pillar. 
Weight which 
woirid crush 
a short pillar of 
the iron used, 
and of the same 
diameter, 
inches (from 
Table VIII.). 
(C.) 
lbs- 
Old Park Iron, No. 1. Cold blast 
Derwent Iron, No. I. Hot blast 
Portland Iron, No. 1. Hot blast 
Calder Iron, No. I. Hot blast 
London Mixture. One-half old plate iron and one- 
half Calder Iron 
Level Iron, No. I. Hot blast 
Coltness Iron, No. I. Hot blast 
Carron Iron, No. 1. Hot blast 
Blaenavon Iron, No. I. Cold blast 
Old Hill Iron, No. I. Cold blast 
437350 
•485750 
469110 
417025 
410210 
337415 
310980 
338450 
346130 
273455 
Second London Mixture. One-third No. I best Scotch 
pig-iron, and two-thirds of old metal 
Low Moor Iron, No. 2. Cold blast 
Blaenavon Iron, No. 3. Cold blast 
Means from all the results in each vertical column ... 
469305 
395415 
426865 
393660 
175-74tons. 
Pillars 10 feet long, from Tables II. and III. 
Breaking weight. 
CB.) 
!■ 
Ulrimate 
decrement of 
length. 
Cltimatc 
defection. 
lbs. 
Mean. 
in. 
in. 
65381 ■! 
66086 lbs. 
-151 
•181 1 
176 
•31 -1 
•38 
66792 ] 
=29'50tons. 
•171/ 
•45] 
57855 1 
62794 lbs. 
•129 
•1641 
172 
•581 
•63 
67733] 
=28 '03 tons. 
•180/ 
•69] 
59736 1 
61147 lbs. 
-130 
•175 \ 
177 
•841 
•88 
62559 ] 
=27’30 tons. 
•179/ 
•92] 
60677 1 
60677 J 
60677 lbs. 
=27‘09tons. 
•145 
•177-1 
•192/ 
184 
•451 
113] 
•79 
59266 1 
54562 j 
56914 lbs. 
=25'41 tons. 
-139 
•190\ 
•188/ 
189 
1-061 
110, 
.1-08 
54091 1 
56443 J 
55267 lbs. 
=24-67 tons. 
•164 
•199\ 
•179/ 
189 
1-141 
•91 J 
■ 1 03 
56443 ] 
52680 lbs. 
•169 
•1631 
•155 J 
159 
•571 
y *51 
48917 J 
=23-52 tons. 
•44 J 
53151 1 
52680 lbs. 
•156 
•1661 
169 
•381 
-42 
52210 J 
=23-52 tons. 
•173/ 
•45 J 
489171 
49858 , 
49387 lbs. 
=2205 tons. 
•143 
•1691 
•159] 
164 
•831 
•65 J 
- '74 
44683 1 
44918 lbs. 
•164 
•1911 
186 
•661 
•64 
45154 J 
=20-05 tons. 
•181 ] 
•61 J 
63499 1 
60912 lbs. 
•130 
•1891 
•174 
•661 
■ -68 
58325 J 
=27-19 tons. 
•159] 
•70 J 
559731 
55973. 
55973 lbs. 
’ =24-99 tons. 
•141 
1-231 
^1-01 
•79 J 
1-001 
•90 
569141 
57855. 
, 57384 lbs. 
’ =25-62 tons. 
•134 
► -95 
52832 
= 23-27 tons. 
•146 
•176 
*75 
