884 
MR. H0DGKI2sS0]S'’S EXPEEBIEXTAL EESEAECHES 
Taele IV. (continued). 
No. of Ex- j 
periment. i 
Description of Pillar, 7 feet 6 inches 
long, and as above. 
Weights 
laid on. 
Decre- 
ment. 
1 
Deflection, j 
Breaking weight, or 
that with which the 
pillar sank. 
Remarks. 
lbs. 
inch. 
inch. 
7. 
Level Iron, No. 1. 
20693 
-061 
Staffordshire. Hot blast. 
.30101 
-082 
From Experiment 12, Table III. 
39509 
•102 
Diameter 2’501 inches. 
48917 
-124 
58325 
-144 
67733 
•165 
77141 
•185 
•08 
81845 
-196 
•17 
86549 
•207 
•22 
91253 
•218 
•32 
95957 
•235 
■54 
98309 
•244* 
•65* 
98309 lbs. = 43-89 tons. 
8. 
Coltness Iron, No. 1. 
20693 
•068 
Edinburgh. Hot blast. 
30101 
•088 
From Experiment 13, Table III. 
39509 
•110 
•08 
Diameter 2'516 inches. 
48917 
•132 
•10 
58325 
•153 
•14 
67733 
•177 
•23 
72437 
•189 
•29 
77141 
•201 
•35 
79493 
•209 
•48 
81845 
•218 
86549 
•251 
•72 to -81 
87019 
•254* 
•92* 
87019 lbs. = 38-85 tons. 
i 
Carron Iron, No. 1. 
20693 
•078 
•10 
Comparing the result fr-om this pillar 
County of Stirling. Hot blast. 
30101 
•101 
•12 
with that from the preceding one 
From Experiment 15, Table III. 
39509 
•124 
•16 
on Coltness Iron, the strengths of 
Diameter 2'506 inches. 
48917 
•149 
•22 
which should have been equal, as 
58325 
•175 
•32 
shown bvthe 10-feet pillars of these 
67733 
•209 
•56 
irons, 1 conceive this experiment to 
70085 
-222 
•66 
he in some degree defective, the pU- 
1 
72437 
•235* 
•76* 
72437 lbs. = 32-34 tons. 
lar having probably been injured by 
, 
the former experiment upon it. 
10. 
Elaenavoii Iron, No. 1. 
20693 
•083 
•07 
South Wales. Cold blast. 
30101 
•106 
•11 
From Experiment 17 or 18, Table 
39509 
•128 
•13 
j 
III. 
48917 
•152 
•17 
Diameter 2-5 inches nearly. 
58325 
•176 
•27 
1 
67733 
•208 
•49 
i 
71967 
•222* 
•59* 
71967 lbs. = 32-13 tons. 
j 11. 
Low Moor Iron, No. 2. 
20693 
•04 
Cut from the pillar in Experiment 
48917 
•07 
12, Table II. 
67733 
•14 
Diameter 2-539 inches. 
72437 
•16 
77141 
•21 
81845 
•28 
86549 
•50 
' 
89371 
•63* 
89371 lbs. =39-90 tons. 
12. 
Blaenavon Iron, No. 3. 
48917 
•08 
Cut out of the pillar in Expert- 
53621 
•10 
' 
ment 13, Table II. 
58325 
•13 
Diameter 2-556 inches. 
63029 
•17 
' 
67733 
•22 
72437 
•27 
1 
77141 
•36 
1 
81845 
•49 
85608 
•59* 
85608 lbs. =38-22 tons. 
13. 
Low Moor Iron, No. 2. 
20693 
•09 
The strength was prohablv reduced 
This pillar differs from the pre- 
25397 
•13 
by being experimented upon he- 
1 
ceding ones in being hollow ; it 
30101 
•18 
fore, and afterwards rendered 
was cut out of the pillar in Ex- 
34805 
•21 
straight; the breaking weight 
periment 2, Table I. 
39509 
•26 
would otherwise have been 63871 
Length 7 feet 6 inches. 
44213 
•29 
lbs. nearly, according to the in- 
External diameter 2-520 inches. 
48917 
•36 
verse l-7th power of the length. 
Internal diameter 1-903 inch. 
51269 
•40 
Ratio of the thicknesses of the sides 
Ends flat. 
53621 
•55 
•20 to -35, the thin side being 
55973 
•70* 
55973 lbs. = 24-99 tons. 
compressed. For form of ffac- 
ture see Plate XXXIII. 
